Dissertations / Theses: 'Age of trees'

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Baker, Patrick John. "Age structure and stand dynamics of a seasonal tropical forest in western Thailand /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/5558.

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Korakaki, Evangelia. "The role of size and age in the physiological ecology of Scots pine and poplar trees." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/12105.

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The main objective of the present thesis is to investigate the mechanisms underlying the age- and size-related decline observed in growth efficiency and in relative above ground mass growth rates in both Scots pine and poplar (clonal) chronosequences. Hence, I compared differentially aged Scots pine stands and trees growing at the same site, in contrast to most previous studies, isolating leaf- from stand-level responses. In addition, I used poplar clonal material to compare growth and morphological parameters of genetically identical cuttings taken from young, middle-age and old plants belonging to four clones and I carried out investigations both in the field on the original donor trees (trees of identical meristematic ages and different sizes) and on rooted cuttings (identical meristematic ages and same size). Scots pine study: Our results partially supported the hydraulic limitation hypothesis, but at the same time suggested that additional factors were also involved in the decline in growth efficiency with age. Such factors may involve decreased soil nutrient availability, increased below-ground allocation and reduced turgor pressure in tall trees. Poplar study: The observed decline in growth and carbon uptake in poplar donor trees in the field was related to the increases in tree size, the increased path length and possibly the architectural complexity, or in some cases to decreased nutrient availability in the soil but not to cellular senescence per se.

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Chavana-Bryant, Cecilia. "Impacts of leaf age on the spectral and physiochemical traits of trees in Amazonian forest canopies." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:381dec4e-387a-4a10-b645-5a11d0c90b51.

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This doctoral research presents the first comprehensive analysis of the morphological, biochemical and spectral leaf traits of canopy and emergent tropical trees during natural (in situ) leaf ageing. It adopts an interdisciplinary approach and combines multiple scales of analysis to generate insights into the effects of natural leaf ageing on our current understanding of tropical leaf trait variation, chemometric models used to spectrally predict leaf traits, and together with other leaf phenological processes, on remotely-sensed vegetation indices (VIs) commonly used to monitor canopy dynamics in tropical evergreen forests. The first research paper of this thesis (Chapter 4) examines the effects of leaf age on morphological and biochemical leaf traits and demonstrates that leaf age is a significant driver of leaf trait variation in Amazonian canopy trees and that leaf age differences could potentially account for a significant fraction of what we currently understand as intra- and interspecific leaf trait variation. It also highlights that age-related trait variation within and between individual trees could play a significant role in shaping community composition and structure of tropical canopies. The leaf traits examined in Chapter 4, among others, have been shown to directly influence the spectral reflectance behaviour of leaves. Therefore, Chapter 5 investigates the effects of leaf age on leaf spectral properties within and across a tropical canopy tree community. This study reveals that trees with diverse leaf properties age in a similar manner in terms of spectral properties. This is one of the most important findings of this thesis and lead to the development of a novel chemometric partial least square regression (PLSR) model to predict leaf age from hyperspectral data. This model extends the utility of current spectroscopic methods and introduces a simple and efficient approach for predicting and monitoring leaf age in lowland tropical forests with important implications for remote sensing. Additionally, this study is the first to provide evidence of age-related reflectance changes in leaves that have significant impacts on vegetation indices commonly used to monitor productivity and canopy dynamics in tropical evergreen forests. Considering the findings of the previous two research chapters, Chapter 6 investigates if chemometric PLSR models used to spectrally predict some of the important leaf traits for plant physiology and economy (leaf mass per area, LMA; water content, LWC; phosphorous, P; nitrogen, N; and carbon, C content) investigated in the previous two research chapters could be significantly biased by variation in leaf age. This is particularly relevant as the current standard protocol is to use only "fully expanded mature leaves" to calibrate these models. This study demonstrates that PLSR models developed using the current standard protocol display age/temporal sensitivity, which has important implications for forest canopy communities with both synchronised and unsynchronised leaf phenology. The final research chapter of this thesis, Chapter 7, demonstrates that the phenological age-related changes in leaf spectral properties reported in Chapter 5 are also expressed at the canopy scale but influenced by both canopy leaf area (CLA) and the leaf phenological behaviour of individual trees. This study also reveals that the seasonality of greenness VIs such as NDVI and EVI2 are more strongly correlated to phenological changes in CLA then changes in leaf reflectance and proposes that NDWI (water content VI) which was found to be strongly correlated to age-related changes in leaf reflectance should complement greenness VIs in phenological studies. Furthermore, by combing leaf, canopy and community scale phenological observations, this study shows that complex and diverse leaf phenological behaviours exhibited by tropical canopy trees, at both the individual and community scale, challenge our current ability to remotely sense tropical canopy dynamics. Finally, this chapter highlights the need for more widespread phenological studies that examine the interaction, covariation, asynchrony and unique behaviours of tropical phenological processes at different scales. Such studies would enable the development of a significant mechanistic understanding of what creates and drives different phenological mosaics identified by remote sensing studies across tropical forests and in modelling their effects on water and carbon fluxes in tropical forest ecosystems.

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McDaniel, Virginia. "Density and Age Distributions of Trees in Upland and Lowland Oldfields 60 Years After Abandonment: The Role of Dispersal." TopSCHOLAR®, 2000. http://digitalcommons.wku.edu/theses/727.

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I attempted to determine whether the patterns of seedling establishment described in the literature for forests and recently abandoned oldfields are maintained in fields sixty years after abandonment. To determine this distribution pattern, as well as to compare patterns of age and density distribution in upland and lowland oldfields, I conducted research at Mammoth Cave National Park. I studied three species, the seeds of which are dispersed by three different modes: Juniperus virginiana, a predominantly bird-dispersed species; Acer rubrum, a predominantly winddispersed species; and Fagus grandifolia, a predominantly mammal-dispersed species. The establishment patterns observed by others in recently abandoned oldfields were not maintained in the sixty-year-old fields analyzed in this study. Age of Juniperus virginiana individuals did not decrease as distance from the edge increased in either uplands or lowlands. Age of Acer rubrum individuals decreased marginally as distance from the edge increased in the upland sites, but slope of the regression was not significant in the lowlands. Ages of Fagus grandifolia individuals decreased significantly as distance from the edge increased in both uplands and lowlands. Migration rate, however, was more rapid than predicted in the literature. Density distribution of stems of each species was even across all oldfields. Rare, long-distance dispersal events are a possible explanation for the establishment patterns observed in these sixty-year-old fields.

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Cao, Xiaoou. "Growth of Galton-Watson trees with lifetimes, immigrations and mutations." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:beaa9fe1-d60c-4487-9520-e8f004b53e6f.

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In this work, we are interested in Growth of Galton-Watson trees under two different models: (1) Galton-Watson (GW) forests with lifetimes and/or immigrants, and (2) Galton-Watson forests with mutation, which we call Galton-Watson-Clone-Mutant forests, or GWCMforests. Under each model, we study certain consistent families (Fλ)λ≥0 of GW/GWCM forests and associated decompositions that include backbone decomposition as studied by many authors. Specifically, consistency here refers to the property that for each μ ≤ λ, the forest Fμ has the same distribution as the subforest of Fλ spanned by the blue leaves in a Bernoulli leaf colouring, where each leaf of Fλ is coloured in blue independently with probability μ/λ. In the first model, the case of exponentially distributed lifetimes and no immigration was studied by Duquesne and Winkel and related to the genealogy of Markovian continuous-state branching processes (CSBP). We characterise here such families in the framework of arbitrary lifetime distributions and immigration according to a renewal process, and show convergence to Sagitov’s (non-Markovian) generalisation of continuous-state branching renewal processes, and related processes with immigration. In the second model, we characterise such families in terms of certain bivariate CSBP with branching mechanisms studied previously by Watanabe and show associated convergence results. This is related to, but more general than Bertoin’s study of GWCM trees, and also ties in with work by Abraham and Delmas, who study directly some of the limiting processes.

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Middleton, Jemima. ""Ah, what an age it is, when to speak of trees is almost a crime" : national landscapes and identities in the fiction of Nadine Gordimer." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20684.

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In this study, I will explore the ways in which Nadine Gordimer engages with the natural world in three of her novels: The Conservationist (1974), July's People (1981), and No Time Like the Present (2012). I argue for the importance of the relationship in her work, between the natural landscapes of South Africa and the responsibility of the author in 'meaning-making:' this is a literary study that brings elements of postcolonial ecocriticism into play. In particular, I will explore how and why she chooses to "speak of trees" at all. Gordimer demonstrates that there is a definitive agency in the non!human world that presses against the reductive binary of 'human' versus 'natural' environments. Her fiction highlights the fact that flattening the natural world into a series of symbols is overly simplistic and does not engage sufficiently with the political: a responsibility that she takes upon herself. In this study I will be arguing that Gordimer achieves a profound political meditation by creating meaning from a variety of natural landscapes, making use of images rather than symbols. I am particularly intrigued by the ways in which Gordimer imagines the landscape as a series of sign systems, whose various shifts and changes reflect and illustrate wider systemic shifts in South Africa. In the novels that I will examine, Gordimer demonstrates, by way of physical, visceral engagement with various landscapes, that historical and contemporary systemic shifts must be taken into account in order truly to understand the complexity of national identities in her country. The image of the trees ties poetry, politics and the environment together, in particular to witness a distinctive shift in political sign systems, and the identity crises that occur as a result. In The Conservationist, Gordimer takes issue with misplaced obsessions with autochthony and heritage, whilst simultaneously investing in the lexical field of botanical names and a fine delineation of literary ecology: the novel both takes apart and preserves a sense of how the landscape can be entwined in a cultivation of identity. In my examination of July's People, I will consider the matter and poetics of the interregnum via the question of "the bush": the environment, landscape and ecosystem contained or in fact uncontained by this term are at the heart of the shift in sign systems that plays out in the novel. The bush in July's People is a heterotopia: an 'other' place that signifies many different meanings, but simultaneously signifies, in the novel, a shift in an entire system of signs. In my final chapter, on No Time Like the Present, I will be continuing to examine the 'language' of trees in Gordimer's work! particularly noting the terminology of trees and plants to signify, and add value to the study of identity and the indigenous versus the alien

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Ottati, Angelo Luiz Tadeu [UNESP]. "Aspectos bioecológicos do pulgão-gigante-do-pinus, Cinara atlantica (Wilson, 1919) (Hemiptera: Aphididae), em Pinus spp. (Pinaceae)." Universidade Estadual Paulista (UNESP), 2004. http://hdl.handle.net/11449/105428.

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Made available in DSpace on 2014-06-11T19:35:00Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-02-17Bitstream added on 2014-06-13T18:45:55Z : No. of bitstreams: 1 ottati_alt_dr_botfca.pdf: 651467 bytes, checksum: a1b92614d7fbcfa2a73dbf3cf0eb427b (MD5)
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Os afídeos são um dos grupos de pragas amplamente distribuídos, causando perdas consideráveis em sistemas agrícolas e florestais. O pulgão-gigante-do-pinus, Cinara atlantica, é atualmente a espécie de pulgão mais disseminada nos plantios de Pinus no Brasil. Devido à sua importância econômica, esse trabalho objetivou avaliar o efeito de diferentes temperaturas e da espécie hospedeira no desenvolvimento de ninfas e na longevidade e capacidade reprodutiva de adultos de C. atlantica, sob condições de laboratório, e determinar a flutuação populacional, a estrutura etária e a caracterização da estrutura espacial do afídeo em áreas florestadas com Pinus taeda e P. caribaea var. caribaea. A determinação do efeito de diferentes temperaturas (18o C, 22o C, 26o C e 30o C) e de hospedeiros (P. taeda e P. caribaea var. hondurensis) no desenvolvimento de C. atlantica foi conduzida sob fotofase de 12 h e umidade relativa do ar de 70 10%. Utilizaram-se 20 insetos (repetições) para cada combinação dos fatores temperatura e hospedeiro e obtiveram-se resultados para variáveis nos estágios ninfal e adulto e ciclo de vida. A determinação da flutuação populacional e da caracterização espacial (50 árvores/avaliação) e da estrutura etária (cinco colônias/avaliação) de C. atlantica foi realizada em áreas de 1 ha com P. taeda e P. caribaea var. caribaea nos municípios de Buri e Nova Campina/SP em 21 avaliações entre julho de 2001 e agosto de 2002. Concluiu-se que o desenvolvimento de ninfas e a longevidade e potencial reprodutivo dos adultos de C. atlantica não foram influenciados pelos hospedeiros P. taeda e P. caribaea var. hondurensis. Entretanto, as temperaturas constantes de 18o C e 22o C conferem as melhores condições, enquanto a de 30o C as piores condições de desenvolvimento aos insetos mantidos em P. taeda e P. caribaea var. hondurensis. C. atlantica... .
Aphids are one of the most widespread groups of pests, causing severe damages on agricultural and forestry systems. Nowadays, the giant conifer aphid, C. atlantica, is widely distributed on pine forests in Brazil. Due to its economic importance, this study aimed to evaluate the effects of different constant temperatures and host plants on the development of nymphs and adults and reproductive capacity in adult of C. atlantica in laboratory, monitoring the populational fluctuation, the age structure and to characterize spatial pattern of C. atlantica in Pinus taeda and P. caribaea var. caribaea plantations. The effect of constant temperatures (18o C, 22o C, 26o C e 30o C) and host plants (P. taeda and P. caribaea var. hondurensis) on the development of C. atlantica was carried out at 12 h of photophase (12 h) and 70 + 10% relative humidity. Twenty nymphs (replications) were tested for each treatment (temperature x host plant) to estimated biological variables of nymph and adult stages and life span. The study of the populational fluctuation, the spatial characterization (50 trees sampled per sampling date) and the age structure (5 aphid colonies per sampling date) of C. atlantica was carried out on P. taeda and P. caribaea var. caribaea plantations in 1 ha area in Buri and Nova Campina municipalities (SP, Brazil), between July 2001 and August 2002 (21 sampling dates). This research indicated that nymph and adult development and reproductive capacity of C. atlantica were not affected by host plants. However, temperatures of 18o C and 22o C provided better conditions for aphid development than 30o C when reared on P. taeda and P. caribaea var. hondurensis. In the field, C. atlantica had highest peaks of abundance in the winter and spring and lowest during the summer. The age structure study can give support to predict population peaks and the occurrence of stable populations indicates a low... (Complete abstract, click electronic address below).

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Esler, William Kevin. "On the development and application of indirect site indexes based on edaphoclimatic variables for commercial forestry in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20145.

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Thesis (MScFor)--Stellenbosch University, 2012.
ENGLISH ABSTRACT: Site Index is used extensively in modern commercial forestry both as an indicator of current and future site potential, but also as a means of site comparison. The concept is deeply embedded into current forest planning processes, and without it empirical growth and yield modelling would not function in its present form. Most commercial forestry companies in South Africa currently spend hundreds of thousands of Rand annually collecting growth stock data via inventory, but spend little or no money on the default compartment data (specifically Site Index) which is used to estimate over 90% of the product volumes in their long term plans. A need exists to construct reliable methods to determine Site Index for sites which have not been physically measured (the socalled "default", or indirect Site Index). Most previous attempts to model Site Index have used multiple linear regression as the model, alternative methods have been explored in this thesis: Regression tree analysis, random forest analysis, hybrid or model trees, multiple linear regression, and multiple linear regression using regression trees to identify the variables. Regression tree analysis proves to be ideally suited to this type of data, and a generic model with only three site variables was able to capture 49.44 % of the variation in Site Index. Further localisation of the model could prove to be commercially useful. One of the key assumptions associated with Site Index, that it is unaffected by initial planting density, was tested using linear mixed effects modelling. The results show that there may well be role played by initial stocking in some species (notably E. dunnii and E. nitens), and that further work may be warranted. It was also shown that early measurement of dominant height results in poor estimates of Site Index, which will have a direct impact on inventory policies and on data to be included in Site Index modelling studies. This thesis is divided into six chapters: Chapter 1 contains a description of the concept of Site Index and it's origins, as well as, how the concept is used within the current forest planning processes. Chapter 2 contains an analysis on the influence of initial planted density on the estimate of Site Index. Chapter 3 explores the question of whether the age at which dominant height is measured has any effect on the quality of Site Index estimates. Chapter 4 looks at various modelling methodologies and compares the resultant models. Chapter 5 contains conclusions and recommendations for further study, and finally Chapter 6 discusses how any new Site Index model will effect the current planning protocol.
AFRIKAANSE OPSOMMING: Hedendaagse kommersiële bosbou gebruik groeiplek indeks (Site Index) as 'n aanduiding van huidige en toekomstige groeiplek moontlikhede, asook 'n metode om groeiplekke te vergelyk. Hierdie beginsel is diep gewortel in bestaande beplanningsprosesse en daarsonder kan empiriese groeien opbrengsmodelle nie in hul huidige vorm funksioneer nie. SuidAfrikaanse bosboumaatskappye bestee jaarliks groot bedrae geld aan die versameling van groeivoorraad data deur middel van opnames, maar weinig of geen geld word aangewend vir die insameling van ongemete vak data (veral groeiplek indeks) nie. Ongemete vak data word gebuik om meer as 90% van die produksie volume te beraam in langtermyn beplaning. 'n Behoefte bestaan om betroubare metodes te ontwikkel om groeiplek indeks te bereken vir groeiplekke wat nog nie opgemeet is nie. Die meeste vorige pogings om groeiplek indeks te beraam het meervoudige linêre regressie as model gebruik. Alternatiewe metodes is ondersoek; naamlik regressieboom analise, ewekansige woud analise, hibriedeof modelbome, meervoudige linêre regressie en meervoudige linêre regressie waarin die veranderlike faktore bepaal is deur regressiebome. Regressieboom analise blyk geskik te wees vir hierdie tipe data en 'n veralgemeende model met slegs drie groeiplek veranderlikes dek 49.44 % van die variasie in groeiplek indeks. Verdere lokalisering van die model kan dus van kommersiële waarde wees. 'n Sleutel aanname is gemaak dat aanvanklike plantdigtheid nie 'n invloed op groeiplek indeks het nie. Hierdie aanname is getoets deur linêre gemengde uitwerkings modelle. Die toetsuitslag dui op 'n moontlikheid dat plantdigtheid wel 'n invloed het op sommige spesies (vernaamlik E. dunnii en E. nitens) en verdere navorsing kan daarom geregverdig word. Dit is ook bewys dat metings van jonger bome vir dominante hoogtes gee aanleiding tot swak beramings van groeiplek indekse. Gevolglik sal hierdie toestsuitslag groeivoorraad opname beleid, asook die data wat vir groeiplek indeks modellering gebruik word, beïnvloed. Hierdie tesis word in ses hoofstukke onderverdeel. Hoofstuk een bevat 'n beskrywing van die beginsel van groeiplek indeks, die oorsprong daarvan, asook hoe die beginsel tans in huidige bosbou beplannings prosesse toegepas word. Hoofstuk twee bestaan uit ń ontleding van die invloed van aanvanklike plantdigtheid op die beraming van groeplek indeks. In hoofstuk drie word ondersoek wat die moontlike invloed is van die ouderdom waarop metings vir dominante hoogte geneem word, op die kwaliteit van groeplek indeks beramings het. Hoofstuk vier verken verskeie modelle metodologieë en vergelyk die uitslaggewende modelle. Hoofstuk vyf bevat gevolgtrekkings en voorstelle vir verdere studies. Afsluitend, is hoofstuk ses ń bespreking van hoe enige nuwe groeiplek indeks modelle die huidige beplannings protokol kan beïnvloed.

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Hůlová, Martina. "Porovnání cen okrasných rostlin zjištěných zjednodušeným a nákladovým způsobem s různou charakteristikou typu zeleně." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-232711.

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The aim of this diploma thesis is to compare prices of ornamental plants founded by simplified and cost method of valuation. Comparison was made on a sample of garden situated in the functional unit with a terraced house and the land built over by this building. Based on the obtained results the influence of different location and age of the trees on their price is evaluated. The thesis also defines basic terms and explains issues which are closely related with valuation of ornamental plants.

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GIUSTI, ELISABETH. "L'utilisation des antidepresseurs chez le sujet tres age." Aix-Marseille 2, 1990. http://www.theses.fr/1990AIX20283.

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11

Ottati, Angelo Luiz Tadeu. "Aspectos bioecológicos do pulgão-gigante-do-pinus, Cinara atlantica (Wilson, 1919) (Hemiptera: Aphididae), em Pinus spp. (Pinaceae)/." Botucatu : [s.n.], 2004. http://hdl.handle.net/11449/105428.

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Orientador: Carlos Frederico Wilcken
Banca: Carlos Alberto Hector Flechtmann
Banca: Célia Regina Lopes Zimback
Banca: Sonia Maria Noemberg Lazzari
Banca: Carlos Alberto Fleichmann
Banca: Edson Tadeu Iede
Resumo: Os afídeos são um dos grupos de pragas amplamente distribuídos, causando perdas consideráveis em sistemas agrícolas e florestais. O pulgão-gigante-do-pinus, Cinara atlantica, é atualmente a espécie de pulgão mais disseminada nos plantios de Pinus no Brasil. Devido à sua importância econômica, esse trabalho objetivou avaliar o efeito de diferentes temperaturas e da espécie hospedeira no desenvolvimento de ninfas e na longevidade e capacidade reprodutiva de adultos de C. atlantica, sob condições de laboratório, e determinar a flutuação populacional, a estrutura etária e a caracterização da estrutura espacial do afídeo em áreas florestadas com Pinus taeda e P. caribaea var. caribaea. A determinação do efeito de diferentes temperaturas (18o C, 22o C, 26o C e 30o C) e de hospedeiros (P. taeda e P. caribaea var. hondurensis) no desenvolvimento de C. atlantica foi conduzida sob fotofase de 12 h e umidade relativa do ar de 70 10%. Utilizaram-se 20 insetos (repetições) para cada combinação dos fatores temperatura e hospedeiro e obtiveram-se resultados para variáveis nos estágios ninfal e adulto e ciclo de vida. A determinação da flutuação populacional e da caracterização espacial (50 árvores/avaliação) e da estrutura etária (cinco colônias/avaliação) de C. atlantica foi realizada em áreas de 1 ha com P. taeda e P. caribaea var. caribaea nos municípios de Buri e Nova Campina/SP em 21 avaliações entre julho de 2001 e agosto de 2002. Concluiu-se que o desenvolvimento de ninfas e a longevidade e potencial reprodutivo dos adultos de C. atlantica não foram influenciados pelos hospedeiros P. taeda e P. caribaea var. hondurensis. Entretanto, as temperaturas constantes de 18o C e 22o C conferem as melhores condições, enquanto a de 30o C as piores condições de desenvolvimento aos insetos mantidos em P. taeda e P. caribaea var. hondurensis. C. atlantica... (Resumo completo, clicar acesso eletrônico abaixo).
Abstract: Aphids are one of the most widespread groups of pests, causing severe damages on agricultural and forestry systems. Nowadays, the giant conifer aphid, C. atlantica, is widely distributed on pine forests in Brazil. Due to its economic importance, this study aimed to evaluate the effects of different constant temperatures and host plants on the development of nymphs and adults and reproductive capacity in adult of C. atlantica in laboratory, monitoring the populational fluctuation, the age structure and to characterize spatial pattern of C. atlantica in Pinus taeda and P. caribaea var. caribaea plantations. The effect of constant temperatures (18o C, 22o C, 26o C e 30o C) and host plants (P. taeda and P. caribaea var. hondurensis) on the development of C. atlantica was carried out at 12 h of photophase (12 h) and 70 + 10% relative humidity. Twenty nymphs (replications) were tested for each treatment (temperature x host plant) to estimated biological variables of nymph and adult stages and life span. The study of the populational fluctuation, the spatial characterization (50 trees sampled per sampling date) and the age structure (5 aphid colonies per sampling date) of C. atlantica was carried out on P. taeda and P. caribaea var. caribaea plantations in 1 ha area in Buri and Nova Campina municipalities (SP, Brazil), between July 2001 and August 2002 (21 sampling dates). This research indicated that nymph and adult development and reproductive capacity of C. atlantica were not affected by host plants. However, temperatures of 18o C and 22o C provided better conditions for aphid development than 30o C when reared on P. taeda and P. caribaea var. hondurensis. In the field, C. atlantica had highest peaks of abundance in the winter and spring and lowest during the summer. The age structure study can give support to predict population peaks and the occurrence of stable populations indicates a low... (Complete abstract, click electronic address below).
Doutor

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12

McCarthy, Meghan E. "THE LEMON TREE: MY TREE OF LIFE." CSUSB ScholarWorks, 2014. https://scholarworks.lib.csusb.edu/etd/49.

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The Lemon Tree is a collection of poems that arose from my attempt to capture memories of influential experiences in growing up. The poems are written in prose blocks and move in and out of childlike and adult sensibilities, creating the disillusion of time and memory. The poems themselves are comments on the unreliability and limited scope of memory and compare remembrance to dreams. This suggests that time moves more fluidly than the waking world accepts. Through looking back, through prisms, the speaker remembers experiences that impacted her development as we follow her on a journey to coming-of-age. The Lemon Tree grapples with becoming and expressing her female fertility and growth as a woman. The speaker constantly searches for love in places of religion, marriage, romantic relationships and friendships. At times, the poems decide what love is by what it isn’t. The act of creating itself was the aim of the manuscript more than the finished project. Some remembrances are intentionally left unclear and messy like wild weeds. The poems are confessional and bear resemblances to a memoir in a lyrical fashion. The Lemon Tree focuses on the processes of life: both the barren and the abundance of fruit, light and dark, winter and summer. The speaker tries to resolve the binaries of trauma and of love and in the process, finds her identity as seen through the symbol of The Lemon Tree, which ultimately becomes her personal tree of life.

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Delsouiller, Marlene. "L'iconographie de l'Arbre sec au Moyen Age." Thesis, Lille 3, 2012. http://www.theses.fr/2012LIL30045.

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Si l’iconographie de l’Arbre sec ou arbre sans feuilles de la Légende du bois de la Croix a marqué le Moyen Age, paradoxalement, elle a peu attiré l’attention des historiens de l’art des XXe et XXIe siècles. Afin de combler cette lacune, nous proposons de développer ce thème dans notre thèse de doctorat. Nous montrons l’aspect formel que les images donnent à cet arbre, l’évolution de sa morphologie au fil des siècles, sa période d’apparition, celle de sa disparition, ainsi que le symbolisme qui lui est attaché, un symbolisme puissant, en relation avec la recherche du Salut. Les images qui illustrent un épisode crucial de la Légende du bois de la Croix — la vision de Seth, le fils d’Adam et Eve, avec l’arbre dénudé au centre du Paradis terrestre — constituent le pivot de notre recherche. Viennent se greffer d’autres images de l’Arbre sec, que nous appelons des « variantes » : la représentation de l’Arbre sec de la légende est transposée dans des contextes extra légendaires, tels ceux des romans d’Alexandre le Grand et du Lancelot-Graal, tel celui de la Divine Comédie, ceux du Devisement du monde de Marco Polo et des Voyages de Jean de Mandeville, ou encore du Pèlerinage de l’âme de Guillaume de Digulleville. L’Arbre sec est aussi dans le tableau de Petrus Christus, la Vierge à l’Arbre sec. Les images montrent l’Arbre sec dans un lieu intemporel, ou au Paradis, ou un lieu qui s’apparente au Paradis. Ce végétal est accompagné de la figure du Christ ou de personnages ou d’animaux le symbolisant. Dans tous les cas, le symbolisme fort et multiple de cet arbre sacré est conservé. L’Arbre sec est tout à la fois un rappel de l’arbre de la connaissance du bien et du mal, une évocation de l’arbre de la Croix et de l’arbre de vie
The iconography of the Dry Tree or leafless tree is present through out the Middle Ages, but paradoxally, its study has only attracted few historians of art of the XXth and XXIst centuries. To compensate for this, we choose to devote our thesis to an extensive study of this tree. We examine the formal aspect given to the Dry Tree depicted in the images, the evolution of its physical form through the centuries, the period when it first appears and when it disappears, as well as the symbolism it carries, a powerful signification related to the quest for Salvation. The core of our research is the images that depict a crucial episod in the Legend of the wood of the Cross — Seth’s vision of the leafless tree of the Earthly Paradise. Other images of the Dry Tree, which we call « variations », are also examined : the theme of the Dry Tree taken from the Legend is transposed in extra-legendary contexts such as in the romances of Alexander the Great and the Lancelot-Graal, the Divine Comedy, the Million by Marco Polo and the Voyages by Jean de Mandeville, as well as the Pilgrimage of the soul by Guillaume de Digulleville. The Dry Tree is also depicted in Our Lady of the Dry Tree by Petrus Christus. The images show the Dry Tree in Paradise or in a place which symbolises Paradise, with Christ in the Dry tree, or figures or animals as symbols of Christ. The powerful and multiple symbolism is present : the Dry Tree is a reference to the tree of the knowledge, to the tree of the Cross and to the tree of life. Therefore, it is no surprise that the images show man in his quest for the Dry Tree, ie in the quest for God

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Bastias, Richard <1973&gt. "Morphological and physiological responses of apple trees under photoselective colored nets." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3349/.

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In recent years and thanks to innovative technological advances in supplemental lighting sources and photo-selective filters, light quality manipulation (i.e. spectral composition of sunlight) have demonstrated positive effects on plant performance in ornamentals and vegetable crops. However, this aspect has been much less studied in fruit trees due to the difficulty of conditioning the light environment of orchards. The aim of the present PhD research was to study the use of different colored nets with selective light transmission in the blue (400 – 500 nm), red (600 – 700 nm) and near infrared (700 – 1100 nm) wavelengths as a tool to the light quality management and its morphological and physiological effects in field-grown apple trees. Chapter I provides a review the current status on physiological and technological advances on light quality management in fruit trees. Chapter II shows the main effect of colored nets on morpho-anatomical (stomata density, mesophyll structure and leaf mass area index) characteristics in apple leaves. Chapter III provides an analysis about the effect of micro-environmental conditions under colored nets on leaf stomatal conductance and leaf photosynthetic capacity. Chapter IV describes a study approach to evaluate the impact of colored nets on fruit growth potential in apples. Summing up results obtained in the present PhD dissertation clearly demonstrate that light quality management through photo-selective colored nets presents an interesting potential for the manipulation of plant morphological and physiological traits in apple trees. Cover orchards with colored nets might be and alternative technology to address many of the most important challenges of modern fruit growing, such as: the need for the efficient use of natural resources (water, soil and nutrients) the reduction of environmental impacts and the mitigation of possible negative effects of global climate change.

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Naylor, Sarah. "The Impacts of Species, Physiological Age and Spacing on Tree Form and Branching." Thesis, University of Canterbury. School of Forestry, 2013. http://hdl.handle.net/10092/9898.

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This dissertation examined the impact of species, physiological age and spacing on tree form and branching at a Nelder experiment located near Rolleston, Canterbury. Two species were compared, Pinus radiata and Eucalyptus nitens, at a range of stockings from 271 stems/ha to 40,466 stems/ha. Within the P. radiata, two different physiological ages were compared. Stocking and species significantly affected (p-value <0.05) tree height, diameter at breast height (DBH), crown depth, branch mortality, branch angle, branch size and internode length. Only stocking was statistically significant for crown width, and height from the ground was also statistically significant for branch angle and branch mortality. DBH, crown width, crown depth, branch size and branch survival decreased with increasing stocking for both species. Branch angle and average internode length increased as stocking increased for both species, and branch angle and average internode length also increased as you moved away from the base of the tree. DBH, average internode length and branch size were significantly larger for P. radiata across all stockings, however branch mortality and branch angle were significantly larger for E. nitens. Physiological age was not statistically significant for any aspects of tree form or branching examined in this study.

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Zhang, Qiran <1982&gt. "Effects of N fertilization on forest trees and ecosystems: water use, WUE, growth." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6636/.

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During my three academic years, I focused on the effects of N fertilization on growth and function of plants and forest stands. The study had the dual objective of estimating the effects of atmospheric N deposition and evaluating the potential management value of N fertilization itself. In particular, the analysis took into account the changes induced in water use and intrinsic transpiration efficiency (ITE), an aspect often overlooked in world literature but of great importance especially in Mediterranean environment, where the positive effects of N fertilization may be denied by the parallel increased transpiration and exacerbated water stress.

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Collins, Eileen Patricia O'Connell 1969. "Skeletochronology as a method of estimating age in the brown tree snake (Boiga irregularis)." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278129.

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I sought to determine if brown tree snakes (Boiga irregularis) raised in captivity showed annual and/or subsidiary growth marks corresponding to feeding or shedding events. I injected 25 brown tree snakes with a fluorescent bone marker (calcein or alizarin red) and raised them for one year under constant conditions. Growth marks beyond the fluorescent marker were correlated with shedding events but not with years or feeding events. Shedding events have not previously been identified as a correlate of growth marks in bone. I do not know if the correlation occurs in other species, as growth cycles have not previously been studied in tropical snakes. The correlation between growth marks and shedding events may allow the study of ecdysis in free-ranging snakes, and shedding events may be the cause of the secondary growth marks found in many reptiles.

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Kraenzel, Margaret. "Carbon storage of Panamanian harvest-age teak (Tectona grandis) plantations." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31249.

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Reforestation is being considered as a mitigation option to help combat the climate change predicted to result from atmospheric carbon dioxide pollution. Forestry-based carbon storage projects are being introduced in many tropical countries, and assessment of species-specific carbon storage potentials is made difficult by a lack of species-level information. This study focuses on teak (Tectona grandis), to measure many of the characteristics affecting the carbon storage potential both of the trees themselves and of the plantations they are in. Root-to-shoot ratio, above- and belowground biomass, as well as tissue carbon content were measured in 20-year-old teak trees in Panamanian plantations. A regression relating diameter at breast height (DBH) to total tree carbon storage for trees of various sizes was developed. To scale up to the plantation level, this regression was used to estimate the carbon storage of the trees of four plantations. Litter, undergrowth, and soil were studied to estimate carbon storage in these compartments. These estimates were collated to form a global estimate of carbon storage in Panamanian harvest age teak plantations. Various methods of calculation of carbon storage in short-rotation plantations are discussed. This work will allow greater precision in the assessment of carbon storage in individual plantations.

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Lightbody, David Ian. "The hybridising tree of life : a postcolonial archaeology of the Cypriot Iron Age city kingdoms." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4374/.

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The people of early Iron Age Cyprus worshipped at sanctuaries where a sacred tree was the focus of their rituals. The tree was closely associated with a goddess thought to inhabit the natural landscape in which the fields and settlements grew, and in which the people lived and worked. This thesis explores why the tree of life was the central symbol of Cypriot Iron Age rituals, covering the period from the end of the Bronze Age to 500 B.C. Although the tree of the goddess has been studied as an artistic motif, and ceramic material from Cyprus has been studied scientifically, material carrying the motif has never been studied within a fully contextualised archaeology that queries its prevalence in Cypriot material culture, its role within the sanctuaries and necropolises of the city kingdoms and the meanings the material carried in those places. This research project addresses the complex, abstract, iconography of the Geometric and Archaic material in a methodical and theoretical manner, and with respect to the local and regional landscape settlement contexts from which it was recovered. The study takes a fresh, postcolonial approach and follows contextualizing, multiscalar methods towards an improved understanding of cultural structures, meanings and individual events. Old concepts of race and fixed groups are discarded in favour of a more nuanced approach that sees individual identities as constantly changing and material culture as both a driver and an indicator of social hybridisation. This research also serves as a vehicle to study a controversial transitional phase in East Mediterranean history, when the ancient agricultural empires gave way to the poleis and colonial systems of the maritime networks. Although the emergence of a ‘great divide’ between east and west has been postulated for this period, the alliances and cultural exchanges that preceded this transformation have not yet been adequately explored in mainstream academic histories. This research focussing on Iron Age Cyprus illuminates regional interaction between African, Levantine and Aegean cultures, and shows that the island existed within a continuous and contiguous cultural milieu that stretched from the Nile to Athens.

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Telles, Renato Katchadur. "Sensibilidade e especificidade de tres criterios diagnosticos de sobrepeso e de obesidade em escolares." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/310667.

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Orientador: Antonio de Azevedo Barros Filho
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas
Made available in DSpace on 2018-08-04T02:45:11Z (GMT). No. of bitstreams: 1 Telles_RenatoKatchadur_M.pdf: 649348 bytes, checksum: 8277622e5d62f8c9e7399060ecf4833c (MD5) Previous issue date: 2004
Resumo: Introdução: Não existe consenso acerca de um critério diagnóstico universal para sobrepeso e obesidade em crianças. Pela simplicidade de obtenção e aplicabilidade o índice de massa corporal (IMC) vem sendo tema de diversos estudos visando seu uso para estes diagnósticos em pediatria. Objetivo: Determinar a sensibilidade e a especificidade de três critérios diagnósticos de sobrepeso e de obesidade que utilizam o IMC em escolares. Material e Método: Foram analisadas 1595 crianças com idade entre 6,93 a 10,94 anos. Todas foram submetidas às medidas de peso e de estatura. A composição corporal dos avaliados foi obtida por meio da bioimpedância do hemicorpo inferior. Foram avaliadas as medidas da sensibilidade e da especificidade de três critérios diagnósticos de sobrepeso e de obesidade que usam o IMC (MUST, DALLAL e DIETZ-1991; COLE et al-2000; CDC-2000). Para a determinação dos valores de corte diagnóstico de sobrepeso/obesidade foi utilizada a curva ROC. Resultados: A sensibilidade dos três métodos diagnósticos de sobrepeso em meninas e meninos variou de 79,34 a 82,64 e de 91,30 a 97,39 respectivamente, enquanto que a especificidade para este diagnóstico variou entre 95,05 e 96,78 nas meninas e 87,50 a 96,43 nos meninos. A variação da sensibilidade para o diagnóstico de obesidade foi de 27,38 a 51,85 nas meninas e de 51,22 a 78,67 nos meninos enquanto que a especificidade para este diagnóstico foi de 98,41 a 100 para as meninas e de 97,44 a 100 para os meninos. Conclusão: Os três métodos diagnósticos avaliados apresentaram boa sensibilidade para classificar sobrepeso; baixa sensibilidade para diagnosticar obesidade; alta especificidade para o diagnóstico de sobrepeso/obesidade. O ponto de corte do índice de massa corporal igual ou maior que 18,50 para as meninas e igual ou maior que 20,00 para os meninos implica em melhora na sensibilidade sem perder qualidade na especificidade deste método em diagnosticar obesidade nos escolares
Abstract: Introduction: There is no consensus for the universal criteria of overweight and obesity diagnosis in children. Due to its simplicity and applicability, the body mass index (BMI) has been the object of several studies aiming at its diagnostic use in pediatrics.Objective: To determine the sensitivity and specificity of three diagnostic criteria of overweight and obesity that use the BMI method in school children.Material and Method: A total of 1595 school children with ages ranging from 6,93 to 10,94 was analyzed. All children had their weight and their height measured. The body composition of the subjects was obtained by means of leg-to-leg bioelectrical impedance analysis. Measurements of sensitivity and specificity of the three diagnostic criteria of overweight and obesity that apply to BMI were assessed (MUST, DALLAL e DIETZ-1991; COLE et al-2000; CDC-2000). To determine the cut-off values for the overweight/obesity, the ROC curve was used. Results: The sensitivity of the three diagnostic methods for determining overweight in girls and boys varied from 79.34 to 82.64 and from 91.30 to 97.39 respectively, while the specificity for this diagnosis varied from 95.05 to 96.78 for the girls and 87.50 to 96.43 for the boys. The sensitivity of variation for the obesity diagnosis was from 27.38 to 51.85 for the girls and for 51.22 to 78.67 for the boys, while the specificity for this diagnosis was from 98.41 to 100 for the girls and from 97.44 to 100 for the boys. Conclusion: The three evaluated methods of diagnosis presented good sensitivity to classify overweight, low sensitivity to diagnose obesity, high specificity for the diagnosis of overweight/obesity. The cut-off point for the body mass index equal or higher than 18.50 for the girls and equal or higher than 20.00 for the boys implies better sensitivity without losing quality in the specificity of this method to diagnose obesity in schoolchildren
Mestrado
Saude da Criança e do Adolescente
Mestre em Saude da Criança e do Adolescente

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Rauchfuss, Julia, and James H. Speer. "Age Dependence of Spiral Grain in White Oaks (Quercus Alba L.) in Southwestern Illinois." Tree-Ring Society, 2006. http://hdl.handle.net/10150/262642.

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Dendrochronologists have used the presence of spiral grain as an indicator of old trees for most of the history of the field, although this relationship has been little studied. We examined cross-sections from dead trees and used a 12-mm Haglof Swedish Increment borer to collect cores from living white oak (Quercus alba L.) trees in an Eastern Deciduous Forest stand in southwestern Illinois. Spiral grain is the alignment of wood fibers to the longitudinal axis of trees and is driven by patterns of initial cambial cell division. In this study, we examine environmental factors that may affect spiral grain severity, the usefulness of non-destructive sampling methods (using the 12-mm increment borer), and the relationship between tree age and spiral grain. We tested Brazier’s method (1965) of averaging the spiral grain angle from two radii taken 180 degrees apart (i.e. one diameter in the tree) to get representative grain angles for the whole circumference of a tree at a certain height. The 12-mm increment borer did not produce consistent results in this study; therefore, the collection of cross-sections is advised for the study of spiral grain in white oaks. Brazier’s method should not be used in white oaks and should not be applied universally to all tree species. The severity of spiral grain is expressed in the xylem and may not be expressed in the bark of the tree. Left spiral grain does generally increase in white oaks with age, although this relationship is not always consistent, so a tree without severe spiral grain is not necessarily young.

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Bravo, Katherine <1983&gt. "Organic fertilization of peach trees: implication on nitrogen availability, root growth and carbon distribution within plant." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3980/.

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In the last years, sustainable horticulture has been increasing; however, to be successful this practice needs an efficient soil fertility management to maintain a high productivity and fruit quality standards. For this purpose composted organic materials from agri-food industry and municipal solid waste has been used as a source to replace chemical fertilizers and increase soil organic matter. To better understand the influence of compost application on soil fertility and plant growth, we carried out a study comparing organic and mineral nitrogen (N) fertilization in micro propagated plants, potted trees and commercial peach orchard with these aims: 1. evaluation of tree development, CO2 fixation and carbon partition to the different organs of two-years-old potted peach trees. 2. Determination of soil N concentration and nitrate-N effect on plant growth and root oxidative stress of micro propagated plant after increasing rates of N applications. 3. Assessment of soil chemical and biological fertility, tree growth and yield and fruit quality in a commercial orchard. The addition of compost at high rate was effective in increasing CO2 fixation, promoting root growth, shoot and fruit biomass. Furthermore, organic fertilizers influenced C partitioning, favoring C accumulation in roots, wood and fruits. The higher CO2 fixation was the result of a larger tree leaf area, rather than an increase in leaf photosynthetic efficiency, showing a stimulation of plant growth by application of compost. High concentrations of compost increased total soil N concentration, but were not effective in increasing nitrate-N soil concentration; in contrast mineral-N applications increased linearly soil nitrate-N, even at the lowest rate tested. Soil nitrate-N concentration influenced positively plant growth at low rate (60- 80 mg kg-1), whereas at high concentrations showed negative effects. In this trial, the decrease of root growth, as a response to excessive nitrate-N soil concentration, was not anticipated by root oxidative stress. Continuous annual applications of compost for 10 years enhanced soil organic matter content and total soil N concentration. Additionally, high rate of compost application (10 t ha-1 year-1) enhanced microbial biomass. On the other hand, different fertilizers management did not modify tree yield, but influenced fruit size and precocity index. The present data support the idea that organic fertilizers can be used successfully as a substitute of mineral fertilizers in fruit tree nutrient management, since they promote an increase of soil chemical and biological fertility, prevent excessive nitrate-N soil concentration, promote plant growth and potentially C sequestration into the soil.

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Rendell, Wallace Boyd. "Evolution of clutch size in tree swallows, trade-offs during reproduction, age-specific fecundity and survivorship." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0019/NQ54431.pdf.

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Irons, Andrea M. "Riparian forest dynamics along the Sacramento River, California| Constructing tree age models to illustrate successional patterns." Thesis, State University of New York Col. of Environmental Science & Forestry, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10245526.

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Though land conversion and flow alteration have heavily impacted the Sacramento River riparian ecosystem, restoration opportunities still exist in the hydrogeomorphically active Middle Reach. This study of riparian forest succession focused on six dominant riparian tree species to explore relative establishment timing and the potential impacts of altered flow regimes. We utilized tree inventory data and increment cores collected from riparian forest stands to establish a temporal chronosequence of floodplain surfaces and associated tree ages and colonization timing. Tree age calculations incorporated raw ring counts and sampling error simulations. Results were then used to construct species-specific, diameterage models and predict age distributions for all inventoried trees. Cottonwood’s colonization window was longer than expected (up to 95 years after floodplain creation), whereas box elder and walnuts established on floodplains <50 years old. This study lays the groundwork for future research into the health and development of the Middle Reach riparian forest.

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Zhao, Wanying. "Genetic, Age, and Spatial Structure to Improve Management of Common Privet (Ligustrum vulgare)." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1325115045.

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Miller, Brian. "Development of a Chaid Decision Tree for Assessing Risk of Detecting Metabolic Syndrome in Adults, Age 20-39 Years." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1342752599.

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Rotondo, Francesca <1972&gt. "Study of Italian isolates of Alternaria spp.: molecular and morphological characterization and pathogenesis on apple tree." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3744/.

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It was decided to carry out a morphological and molecular characterization of the Italian Alternaria isolatescollected from apple , and evaluate their pathogenicity and subsequently combining the data collected. The strain collection (174 isolates) was constructed by collecting material (received from extension service personnel) between June and August of 2007, 2008, and 2009. A Preliminary bioassays were performed on detached plant materials (fruit and leaf wounded and unwounded), belonging to the Golden cultivar, with two different kind of inoculation (conidial suspension and conidial filtrate). Symptoms were monitored daily and a value of pathogenicity score (P.S.) was assigned on the basis of the diameter of the necrotic area that developed. On the basis of the bioassays, the number of isolates to undergo further molecular analysis was restricted to a representative set of single spore strains (44 strains). Morphological characteristics of the colony and sporulation pattern were determined according to previous systematic work on small-spored Alternaria spp. (Pryor and Michaelides, 2002 and Hong et al., 2006). Reference strains (Alternaria alternata, Alternaria tenuissima, Alternaria arborescens and four Japanese strains of Alternaria alternata mali pathotype), used in the study were kindly provided by Prof. Barry Pryor, who allows a open access to his own fungal collection. Molecular characterization was performed combining and comparing different data sets obtained from distinct molecular approach: 1) investigation of specific loci and 2) fingerprinting based on diverse randomly selected polymorphic sites of the genome. As concern the single locus analysis, it was chosen to sequence the EndoPG partial gene and three anonymous region (OPA1-3, OPA2- and OPa10-2). These markers has revealed a powerful tool in the latter systematic works on small-spored Alternaria spp. In fact, as reported in literature small-spored Alternaria taxonomy is complicated due to the inability to resolve evolutionary relationships among the taxa because of the lack of variability in the markers commonly used in fungi systematic. The three data set together provided the necessary variation to establish the phylogenetic relationships among the Italian isolates of Alternaria spp. On Italian strains these markers showed a variable number of informative sites (ranging from 7 for EndoPg to 85 for OPA1-3) and the parsimony analysis produced different tree topologies all concordant to define A. arborescens as a mophyletic clade. Fingerprinting analysis (nine ISSR primers and eight AFLP primers combination) led to the same result: a monophyleic A. arborescens clade and one clade containing both A. tenuissima and the A. alternata strains. This first attempt to characterize Italian Alternaria species recovered from apple produced concordant results with what was already described in a similar phylogenetic study on pistachio (Pryor and Michaelides, 2002), on walnut and hazelnut (Hong et al., 2006), apple (Kang et al., 2002) and citurus (Peever et al., 2004). Together with these studies, this research demonstrates that the three morphological groups are widely distributed and occupy similar ecological niches. Furthermore, this research suggest that these Alternaria species exhibit a similar infection pattern despite the taxonomic and pathogenic differences. The molecular characterization of the pathogens is a fundamental step to understanding the disease that is spreading in the apple orchards of the north Italy. At the beginning the causal agent was considered as Alteraria alternata (Marshall and Bertagnoll, 2006). Their preliminary studies purposed a pathogenic system related to the synthesis of toxins. Experimental data of our bioassays suggest an analogous hypothesis, considering that symptoms could be induced after inoculating plant material with solely the filtrate from pathogenic strains. Moreover, positive PCR reactions using AM-toxin gene specific primers, designed for identification of apple infecting Alternaria pathovar, led to a hypothesis that a host specific toxin (toxins) were involved. It remains an intriguing challenge to discover or not if the agent of the “Italian disease” is the same of the one previously typified as Alternaria mali, casual agent of the apple blotch disease.

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Lezzer, Paolo <1980&gt. "Architectural development and dry matter production in a multisite trial on single and multiaxis apple trees (Malus domestica Borkh) grafted on different rootstocks." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3969/.

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In two Italian sites, multiaxis trees slightly reduced primary axis length and secondary axis length of newly grafted trees, and increased the number of secondary shoots. The total length, node production, and total dry matter gain were proportional to the number of axis. Growth of both primary and secondary shoots, and dry matter accumulation, have been found to be also well related to rootstock vigour. A great variability in axillary shoot production was recorded among different environments. Grafted trees had higher primary growth, secondary axis growth, and dry matter gain than chip budded trees. Stem water potential measured in the second year after grafting was not affected by rootstocks or number of leaders. Measurements performed in New Zealand (Hawke’s Bay) during the second year after grafting revealed that both final length and growth rate of primary and secondary axis were related to the rootstock rather than to the training system. Dwarfing rootstocks reduced the number of long vegetative shoots and increased the proportion of less vigorous shoots.

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Abdul, Hamid Hazandy. "Effects of tree age and size on growth, physiology and water use of Acer pseudoplatanus L. and Fraxinus excelsior L." Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/11231.

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Generally, the growth of all forests accelerate as canopies develop as in young forests and declines substantially soon after maximum leaf area is attained. The causes of this decline trend are multiple. However, age and size are normally coupled growth. Therefore, an experimental manipulation has been done to separate the effects of size from those of age by using traditional grafting techniques. Genetically identical grafted seedlings were produced from scions taken from trees of four different age classes ranged from 4 to 162 years. The aim of this study is to investigate the effects of tree age and tree size on growth, physiology and water use of two broadleaf species by conducting three major experiments. Growth characteristics such as relative growth rate and growth efficiency were measured together with leaf-level gas exchanges and sap flow studies. Comparisons were established among results observed in the field with the ones obtained in the grafted seedlings. The results showed that relative growth rate and growth efficiency decreased substantially with increase in age of donor trees in the field. In contrast, these parameters seemed almost constant on grafted seedlings which are scions taken from different meristematic ages did not show the age-related trend after they were grafted onto the rootstocks. Similar patterns were also observed in net photosynthesis from leaf-level gas exchange and sap-flow-based parameters in both species. In general, these results suggested that size limitation to water and nutrient transport to the top of the canopy is a primary cause that triggered the declination in production of photosynthate and reduced growth of the trees, and/or increase in maintenance respiration with increasing in tree size rather than controlled by meristematic age.

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BOUMIZ, ABDELLATIF. "Etude comparee des evolutions mecaniques et chimiques des pates de ciment et mortiers a tres jeune age. Developpement des techniques acoustiques." Paris 7, 1995. http://www.theses.fr/1995PA077269.

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Nous avons developpe des techniques de transmission et de reflexion des ondes ultrasonores pour suivre en continu et en temps reel la prise et le durcissement des pates de ciment et mortiers. Nous avons applique simultanement les techniques acoustique, calorimetrique et conductimetrique pour suivre les evolutions mecaniques et chimiques. Les modules elastiques effectifs des echantillons sont fournis par la mesure des vitesses des ondes de compression et de cisaillement. La mesure de la chaleur d'hydratation par la technique de calorimetrie isotherme nous permet de calculer le degre d'hydratation. Les modules elastiques des pates de ciment et mortiers sont ainsi etudies en fonction du temps et du degre d'hydratation. Le seuil de percolation a ete associe au minimum de la vitesse des ondes de compression. Le degre d'hydratation au seuil de percolation a ete determine pour plusieurs rapports e/c sur des pates de ciment blanc et de c#3s. L'etude de l'effet du rapport e/c sur l'evolution des modules elastiques en fonction du degre d'hydratation nous a amenes a definir le rendement mecanique de l'hydratation par la derivee du module de young par rapport au degre d'hydratation. Ce rendement est d'autant plus grand que le rapport e/c est faible. La comparaison du rendement mecanique d'une pate de ciment pure et d'une pate adjuvantee nous a permis de conclure que la presence de certains adjuvants rend la connexion des grains plus efficace. La relation de feret qui prevoit la resistance en compression en fonction de la porosite initiale a ete adaptee pour l'etude des modules elastiques en fonction du degre d'hydratation des mortiers de beton. La relation entre la resistance en compression mesuree par la rupture des eprouvettes et le module de young mesure par la technique acoustique suit une loi de puissance dont l'exposant evolue en fonction du degre d'hydratation. L'effet de la temperature sur l'evolution des modules elastiques en fonction du degre d'hydratation a ete interprete en terme d'energie d'activation mecanique globale du materiau. Cette derniere evolue en fonction de l'avancement des reactions d'hydratation. L'effet de la concentration de sable sur les modules elastiques des mortiers a ete etudie et a montre que le modele de berryman represente une tres bonne approximation des resultats experimentaux. La modelisation de l'evolution des modules elastiques en fonction du degre d'hydratation necessite la connaissance des modules elastiques du clinker anhydre et des hydrates. Des experiences specifiques nous ont permis de mesurer ces constantes. La nucleation d'une partie des hydrates a l'interieur des pores capillaires nous a amenes a comparer les modules elastiques mesures et les modules elastiques d'un materiau ideal ou la totalite du solide present dans le melange est connectee. Le degre de connectivite a ete defini par le rapport du module de young mesure par le module de young du milieu ideal calcule. Ce degre est d'autant plus grand que le rapport e/c est faible et que le degre d'hydratation est important

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DeGomez, Tom. "Guidelines for Thinning Ponderosa Pine for Improved Forest Health and Fire Prevention." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2006. http://hdl.handle.net/10150/146952.

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7 pp.
Preventing catastrophic stand replacing events are best accomplished through thinning. Lower tree densities result in greater tree growth. Stands with lower tree densities have greater plant diversity. Determining stand conditions will provide a baseline for formulating a plan to improve stand conditions. Thinning around individual trees can improve individual tree health reducing the likelihood of damage from bark beetles, fire or drought.

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Häggblad, Erik, and Claes Arvidsson. "Skatta beståndsålder och ståndortsindex via flygbilder." Thesis, Linnéuniversitetet, Institutionen för skog och träteknik (SOT), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-90449.

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Hållbart skogsbruk kräver kunskap om skogens tillstånd i nutid samt tänkbara framtida åtgärder. Syftet med studien var att undersöka om det via digitala flygbilder var möjligt att skatta trädålder och SI på beståndsnivå, samt med vilken precision det kan utföras.Endast tall- och/ eller grandominerade bestånd, valdes i Vetlanda och Nybro kommun. Flygbilderna bearbetades av Foran Sverige AB med hjälp av ett program framtaget av Spacemetric AB.De fältinventerade beståndens data jämfördes med medianvärden från de skattade trädhöjderna, vilka matades in i en formel, konstruerad för att göra en kurvanpassning mot de nya höjdutvecklingskurvorna.Metoden för framtagning av höjdvärden via bildmatchning bör förfinas, t.ex. bör laserskanningen bidra med högre precision. Endast mindre delar av landet har mer än en skanningstidpunkt med laser, metoden kräver minst två höjdvärden i serie.Syftet med studien anses uppfyllt, dock hade studien tjänat på en bättre metod för att sålla bort felaktiga data innan analys. Generaliserbarheten är god på liknande bestånd, vidare studier krävs för att kunna påvisa en användarbarhet i olika typer av bestånd, där även olika skötselvarianter bör vägas in.

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Mesa, Juliani Karen <1982&gt. "Starch distribution in pear tree organs in relation to training systems, rootstocks and fruit quality." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/7158/.

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Starch is the main form in which plants store carbohydrates reserves, both in terms of amounts and distribution among different plant species. Carbohydrates are direct products of photosynthetic activity, and it is well know that yield efficiency and production are directly correlated to the amount of carbohydrates synthesized and how these are distributed among vegetative and reproductive organs. Nowadays, in pear trees, due to the modernization of orchards, through the introduction of new rootstocks and the development of new training systems, the understanding and the development of new approaches regarding the distribution and storage of carbohydrates, are required. The objective of this research work was to study the behavior of carbohydrate reserves, mainly starch, in different pear tree organs and tissues: i.e., fruits, leaves, woody organs, roots and flower buds, at different physiological stages during the season. Starch in fruit is accumulated at early stages, and reached a maximum concentration during the middle phase of fruit development; after that, its degradation begins with a rise in soluble carbohydrates. Moreover, relationships between fruit starch degradation and different fruit traits, soluble sugars and organic acids were established. In woody organs and roots, an interconversion between starch and soluble carbohydrates was observed during the dormancy period that confirms its main function in supporting the growth and development of new tissues during the following spring. Factors as training systems, rootstocks, types of bearing wood, and their position on the canopy, influenced the concentrations of starch and soluble carbohydrates at different sampling dates. Also, environmental conditions and cultural practices must be considered to better explain these results. Thus, a deeper understanding of the dynamics of carbohydrates reserves within the plant could provide relevant information to improve several management practices to increase crop yield efficiency.

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Santos, Katia Ricci dos. "Imagens e narrativas de uma instituição asilar e da velhice, construidas por tres segmentos distintos : idosos moradores, gestores e voluntarios." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/252520.

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Orientador : Margareth Brandini Park
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Educação
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Resumo: A fim de contribuir para a melhoria das instituições de longa permanência, essa pesquisa tem como objetivo analisar como três segmentos distintos ? asilados, voluntários e gestores ? constroem e ressignificam a história de um asilo e as suas histórias de vida a partir dos vínculos institucionais. A pesquisa foi desenvolvida numa instituição de longa permanência, a Vila São Vicente de Paulo, fundada em Atibaia - SP em 1924. A metodologia usada foi a pesquisaação, utilizando-se no processo de reconstrução da história institucional e da história dos sujeitos imagens fotográficas do acervo oficial associadas à história oral. A análise dos dados foi composta: a) da visão panorâmica das narrativas individuais produzidas da seleção de imagens; b) discussão dos principais temas levantados em cada segmento associando-os aos conceitos encontrados na literatura: afetividade na velhice asilada, declínio físico e finitude (asilados), valorização das atividades e dos relacionamentos sociais (voluntários) e visão administrativa do cuidar de velhos (gestores); c) interpretação das fotografias excluídas. A afetividade e a sexualidade dentro do asilo são vividas de forma emblemática, ou seja, há estratégias do cotidiano, como as festas, para poder expressá-las. A finitude é um tema constantemente presente no discurso. Os voluntários pretendem ser o vínculo com o mundo externo e proporcionar atividades sociais consideradas fundamentais. Existe a preocupação dos gestores em administrar a instituição oferecendo mais do que alimentação, cuidados de saúde e habitação, mas a maioria sente que não tem formação gerontológica para fazê-lo
Abstract: Intending to improve the long-term care institutions, this study aims to analyze how three distinguished groups - dwellers, volunteers and managers - affect na institution's history and the new significance of their own lives concerning their relationship with it. The research was developed in Vila São Vicente de Paulo, a long-term care institution in Atibaia, SP, founded in 1924. The methodology used was action-search using photographs from the institution?s collection, and oral history throughout the history reconstruction. Data analysis involved three steps: A) overview of the individual narratives, recorded from the chosen photographs, b) discussion of the themes considered the most important ones for each group na linking them with concepts of the literature: affect in the old age in an institution (for the elderly), bodily decay and finitude (dwellers), valorization of activities and social relationship (volunteers) and perceptions of caring for older persons (managers); c) interpretation of the photographs which were not chosen. Affection and sexuality in the institution are dealt with in symbolic ways, with daily strategies like parties and events. The theme finitude is frequently mentioned somehow. The volunteers intend to link institution and extramural community, and provide activities considered (by them) fundamental. the managers concern about caring for the institution and offering more than only proper alimentation, health caring and homes, but many consider themselves insufficiently prepared concerned knowledge
Mestrado
Gerontologia
Mestre em Gerontologia

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Wang, Zhiming. "Stability and predictability of diameter distributions in a managed uneven-aged oak forest /." free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9841345.

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Nilson, Kristina. "Regeneration dynamics in uneven-aged Norway spruce forests with special emphasis on single-tree selection /." Umeå : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-6093-X.pdf.

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Axelsson, Robert. "Forest policy, continuous tree cover forest and uneven-aged forest management in Sweden's boreal forest /." Uppsala : Institutionen för skogens produkter, Sveriges lantbruksuniversitet (SLU), 2008. http://epsilon.slu.se/10947312.pdf.

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Zibordi, Marco <1978&gt. "Crop load control in apple via shading: exploring the potential of carbon unbalances to manage fruit growth and tree performance." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2866/.

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Sousa, Ana Carolina de Oliveira. "Crescimento e nutri??o de clones de Hevea brasiliensis sob diferentes doses de nitrog?nio, f?sforo e pot?ssio." Universidade Federal Rural do Rio de Janeiro, 2015. https://tede.ufrrj.br/jspui/handle/jspui/1644.

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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES
The assessment of nutritional status of plants such as rubber is important, as it needs, at all stages of its development of a proper fertilization program, which combined with the correct choice of genetic material, will generate significant productivity gains by avoiding the use unnecessary nutrients. There is a growing demand for natural rubber in the world, and the state of Rio de Janeiro land with favorable conditions for the development of the culture of rubber. Combined with social, economic and environmental importance, rubber cultivation is an alternative economic value to degraded areas and rugged state. The hypothesis is that the adaptation of rubber tree clones is related to genetic material and nutritional demand, reflecting productivity. The objectives of this study were to evaluate the growth of the clones RRIM 600 and PR 255 of Hevea brasiliensis in relation to different levels of nitrogen, potassium and phosphorus. They were tested 28 combinations of nitrogen, phosphorus and potassium for each of the clones, and data were collected from height, diameter and dry weight of plants. Crossing the information, the best results overall were obtained with the treatments 2 (40-50-40), 5 (40-100-40) grams of nitrogen, phosphorus and potassium per plant respectively. Both clones use on average, the same amount of nutrients, but clone RRIM 600 develops more at first, indicating less efficient use of nutrients by clone PR 255, which should not be used on poor soils when compared to the RRIM 600
A avalia??o do estado nutricional de plantas como a seringueira ? importante, pois ela necessita, em todas as fases de seu desenvolvimento, de um correto programa de aduba??o, que aliado ? correta escolha do material gen?tico, ir? gerar ganhos significativos de produtividade evitando o uso desnecess?rio de determinados nutrientes. Existe uma demanda crescente pela borracha natural em todo o mundo, e o estado do Rio de Janeiro terras com condi??es satisfat?rias para o desenvolvimento da cultura da seringueira. Aliado ? import?ncia social, econ?mica e ambiental, o cultivo da seringueira ? uma alternativa de valoriza??o econ?mica para ?reas degradadas e relevo acidentado do estado. A hip?tese testada foi de que a adapta??o dos clones de seringueira est? relacionada ao material gen?tico e ? demanda nutricional, refletindo na produtividade. Os objetivos deste trabalho foram avaliar o crescimento dos clones RRIM 600 e PR 255 de Hevea brasiliensis em rela??o a diferentes doses de nitrog?nio, pot?ssio e f?sforo. Foram testadas 28 combina??es de nitrog?nio, f?sforo e pot?ssio para cada um dos clones, e foram coletados dados de altura, di?metro e massa seca das plantas. Cruzando as informa??es, foram obtidos os melhores resultados no geral com os tratamentos 2(40-50-40), 5(40-100-40) gramas de nitrog?nio, f?sforo e pot?ssio por planta respectivamente. Ambos os clones, utilizam em m?dia, a mesma quantidade de nutrientes, por?m o clone RRIM 600 se desenvolve mais a princ?pio, indicando menor efici?ncia no uso de nutrientes pelo clone PR 255, que n?o deve ser usado em solos pobres, quando comparado ao RRIM 600.

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Carmo, Jair Figueiredo do. "Crescimento e propriedades da madeira de Copaifera langsdorffii Desf. sob regime de manejo florestal." Universidade Federal Rural do Rio de Janeiro, 2016. https://tede.ufrrj.br/jspui/handle/jspui/1671.

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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES
The objective of this research was to study the growth and wood properties of Copaifera langsdorffii trees in an open rain forest, under a forest management system in the state of Mato Grosso, Brazil. Therefore, samples from 20 trees were collected, and the development of the research was divided into two stages. In the first one, a dendrochronological study for the species was carried out and in the second one, a study of the effect of forest management on the anatomical, chemical and physical properties of C. langsdorffii wood. The area where the trees were collected, has as main characteristic the fact that had occurred the first lumbering in 1987 and reaching his second cutting cycle in 2013. During the dendrochronological study, a master chronological series of the tree species and also an analysis of the cambium sensitivity to climatic variations (temperature and precipitation) were done. Furthermore, weather effects of El Ni?o event were found in the growth of those trees. The study of the effect of forest management on the properties of wood, was carried through the anatomical, physics and chemistry characterization of woods that were formed 10 years before and 10 years after the first cutting cycle that had occurred in 1987. It was also analyzed the effect of the distance of the trees studied in relation to the glade (remaining stub) opened in the year of the first lumbering, in 1987. The results indicated that C. langsdorffii has potential to the dendrochronological studies, presenting a significant correlation between the width of the rings within and among those trees. The forest management led to diametrical higher increases than those observed before the first lumbering. It was observed that the higher diametrical growth of trees occurred during periods of the year in which the precipitation rate is higher. The study indicated a significant change in anatomical structure of the wood, by the increased frequency of vessels and decreasing width of rays formed on wood after lumbering in1987. Those results were also observed for the trees distances in relation to the glade. The changes into anatomical structure showed a decrease in the density of the wood formed after 1987. By chemical analysis, 10 chemical elements were found, 4 macro and 6 micronutrients. There was no significant difference in the assimilation of minerals into the wood as a result of forest management. Thus, there was no negative effect on the availability of nutrients to the C langsdorffii. Overall the results showed that forest management was beneficial to the C. langsdorffii, growth because that action led to possible and considerable gains in growth after forest intervention, without incurring significant losses in the anatomical, physical and chemical structure in the wood species.
O objetivo deste trabalho foi estudar o crescimento e propriedades da madeira em ?rvores de Copaifera langsdorffii de uma floresta ombr?fila aberta, sob regime de manejo florestal, no estado de Mato Grosso. Para tanto, foram coletadas amostras de 20 ?rvores, e o desenvolvimento do trabalho foi dividido em duas etapas. Na primeira, foi realizado um estudo dendrocronol?gico para a esp?cie e, na segunda, um estudo do efeito do manejo florestal nas propriedades anat?micas, qu?micas e f?sica da madeira de C. langsdorffii. A ?rea, onde foram coletadas as ?rvores, tem como principal caracter?stica o fato de ter ocorrido a primeira explora??o florestal no ano de 1987 e atingindo seu segundo ciclo de corte no ano de 2013. No estudo dendrocronol?gico, foi constru?da uma s?rie cronol?gica mestre da esp?cie e an?lises da sensibilidade cambial ?s varia??es clim?ticas (temperatura e precipita??o). Al?m disso, verificou-se os efeitos clim?ticos do evento El Ni?o no crescimento das ?rvores. O estudo do efeito do manejo florestal nas propriedades da madeira foi realizado atrav?s da caracteriza??o anat?mica, f?sica e qu?mica dos lenhos formados10 anos antes e 10 anos depois do primeiro ciclo de corte ocorrido em 1987. Foi tamb?m analisado o efeito da dist?ncia das ?rvores estudadas em rela??o ? clareira (toco remanescente) aberta no ano da primeira explora??o de 1987. Os resultados obtidos indicaram que a C. langsdorffii apresenta potencial para estudos dendrocronol?gicos, apresentando uma correla??o significativa da largura dos an?is dentro e entre ?rvores. O manejo florestal propiciou incrementos diametrais superiores aos observados antes da primeira explora??o. Observou-se que os maiores incrementos diametrais das ?rvores ocorreram nos per?odos do ano em que o ?ndice de precipita??o ? maior. O estudo indicou altera??es significativas na estrutura anat?mica da madeira, atrav?s do aumento da frequ?ncia de vasos e redu??o largura dos raios na madeira formada ap?s a explora??o florestal de 1987. Esses resultados tamb?m foram encontrados na an?lise de dist?ncia da ?rvore estudas em rela??o ao toco remanescente. As altera??es na estrutura anat?mica denotaram uma diminui??o da densidade aparente da madeira formada p?s 1987. Atrav?s da an?lise qu?mica foram encontrados 10 elementos qu?micos, sendo 4 macros e 6 micronutrientes. N?o houve diferen?a significativa na assimila??o de minerais na madeira decorrentes do manejo florestal. Assim, n?o houve efeito negativo na disponibilidade de nutrientes para a C. langsdorffii. De modo geral, os resultados encontrados demonstraram que o manejo florestal foi ben?fico para a C. langsdorffii, pois possibilitou ganhos consider?veis de incremento ap?s a interven??o florestal, sem acarretar preju?zos relevantes na estrutura anat?mica, f?sica e qu?mica no lenho da esp?cie.

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Addison, Audrey L. "Beetles, Fungi and Trees: A Story for the Ages? Modeling and Projecting the Multipartite Symbiosis Between the Mountain Pine Beetle, Dendroctonus ponderosae, and Its Fungal Symbionts, Grosmannia clavigera and Ophiostoma montium." DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/2302.

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As data collection and modeling improve, ecologists increasingly discover that interspecies dynamics greatly affect the success of individual species. Models accounting for the dynamics of multiple species are becoming more important. In this work, we explore the relationship between mountain pine beetle (MPB, Dendroctonus ponderosae Hopkins) and two mutualistic fungi, Grosmannia clavigera and Ophiostoma montium. These species are involved in a multipartite symbiosis, critical to the survival of MPB, in which each species benefits. Extensive phenological modeling has been done to determine how temperature affects the timing of life events and cold-weather mortality of MPB. The fungi have also been closely studied to determine how they interact with MPB and how they differ in terms of virulence, response to temperature, and nutritional benefits to developing beetles. Overall, researchers consider G. clavigera to be the superior mutualist. Beetles developing near G. clavigera are larger, produce more brood, and have higher survival rates. Regarding temperature preferences, G. clavigera is considered “cool-loving,” growing at cooler temperatures than O. montium. These findings lead researchers to wonder 1) why has G. clavigera not displaced iv O. montium from the mutualism (if it is the superior mutualist) and 2) what will happen to the MPB-fungus mutualism in the face of a warming climate. In this work we present two models connecting fungal growth in a tree to predictions of MPB emergence: a stochastic, individual-based model and a deterministic, tree-based model. We begin by exploring whether variability in temperature can act as a stabilizing mechanism and find that temperature variability due to MPB periodically transitioning between different thermal environments is the most likely explanation for the continued presence of both fungi in the mutualism. Using the second model, we parameterize and validate the model using attack and emergence observations of MPB and the fungi they are carrying. In the process, we test several submodels to learn more about specific MPB-fungi interactions. Finally, utilizing information from previous fungal growth experiments, we test and parameterize several growth rate curves using Bayesian techniques to determine whether the inclusion of prior knowledge can lead to more realistic fits.

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Alsayed, Mahmoud. "Commerce et transformation des produits d’arbres et d’arbustes (bois, fruits frais et secs, racines, rameaux, feuilles, fleurs, graines, farine, poudre, parfum, encens, vin et huile) pour l’architecture, l’économie, la médecine, le culte et la magie à Ougarit et dans les royaumes et les empires environnants et au Bronze récent, d’après les données des sciences naturelles, des sources archéologiques et épigraphiques." Thesis, Paris 4, 2011. http://www.theses.fr/2011PA040285.

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Le sujet de cette étude est le commerce et l’utilisation de divers produits issus d’arbres et d’arbustes dans le royaume d’Ougarit, situé sur la côte de la Syrie et dont la documentation écrite nous renseigne sur l’époque du Bronze récent, principalement les XIVe et XIIIe siècles avant J.-C. Ce royaume est particulièrement bien connu grâce aux milliers de tablettes trouvées depuis 82 ans sur le site de Ras Shamra et plus récemment sur celui de Ras Ibn Hani. Ces tablettes sont écrites très majoritairement dans deux langues et deux systèmes d’écriture cunéiforme : d’une part, la langue locale, baptisée « ougaritique », notée grâce à un système alphabétique, d’autre part, l’akkadien babylonien, noté selon un système logo-syllabique. A cheval entre la côte et la montagne, ce royaume était situé entre les deux grandes régions pourvoyeuses de bois dans la plus haute antiquité, comme en atteste la documentation égyptienne et mésopotamienne, ainsi que la Bible, la montagne libanaise et l’Amanus. Le lieu est donc particulièrement important pour ce sujet. Après un aperçu géographique, démographique, linguistique, historique et économique sur le royaume d'Ougarit, nous avons étudié successivement l'ébène, le pin et le sapin, le cèdre, le genévrier, le cyprès, le buis, le ¶rgz, le palmier, l’olivier et le bois-¶lmg, ainsi que le vignoble, la vigne et ses produits.Nous avons commencé chaque chapitre par une identification botanique et linguistique. Puis nous avons tenté de situer quelles étaient les régions qui étaient les sources principales de ces richesses naturelles. Ensuite, nous avons établi un aperçu historique sur le commerce des produits d'arbres et d’arbustes et sur les moyens de transport. Nous avons tenté de préciser leur nature, leur quantité, leur qualité, leur poids et leur prix à Ougarit et à l'extérieur. A la fin, nous avons étudié les diverses utilisations et leur rôle dans l'artisanat, la médecine, la religion et la magie dans l'antiquité. Ce faisant, il nous a été donné aussi d’approcher la valeur symbolique de ces arbres et de ces bois
The subject of our dissertation is the trade and use of various products derived from trees and shrubs in the Kingdom of Ugarit, located on the coast of Syria and whose written documentation informs us about the Late Bronze Age, mainly fourteenth and thirteenth centuries BC. The kingdom is well known thanks to the thousands of tablets found in the last 82 years on the site of Ras Shamra and more recently that of Ras Ibn Hani. These tablets are written overwhelmingly in two languages and two systems of cuneiform writing: first, the local language, called “Ugaritic”, noted in an alphabetic system, on the other hand, the Babylonian Akkadian, noted by a logo-syllabic script. Situated between the coast and mountains, this kingdom was located between two major regions suppliers of timber in the most remote antiquity, as evidenced by Egyptian and Mesopotamian literature and the Bible, the Lebanese mountains and the Amanus mountain. The place is thus particularly important for this topic. Following an overview of geographical, demographic, linguistic, historical and economic on the kingdom of Ugarit, we studied successively ebony, pine and fir, cedar, juniper, cypress, boxwood, ¶Rgz, palm-tree, olive-tree, ñlmg-wood and vineyard, the vine and its products .We started each chapter with a botanical and linguistical identification. We tried to locate what were the areas that were the main sources of these natural resources. Then, we established a historical overview on the trade in products from trees and transportation. We tried to clarify their nature, quantity, quality, weight and price in Ugarit and outside. Finally, we examined the various uses and their role in craft, medicine, religion and magic. In doing so, we could also approach the symbolic value of these trees and woods

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Conte, Elise R. "APPLICATIONS OF ISOTOPES TO MAGMATIC PROCESSES, ERUPTION AGES, AND NUCLEAR FORENSICS." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1494441688196002.

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RINALDI, MONICA FERNANDA. "Modellazione dell’impatto del cambiamento climatico sulla interazione pianta - patogeni a livello regionale nel Trentino – Italia." Doctoral thesis, Università Cattolica del Sacro Cuore, 2013. http://hdl.handle.net/10280/1747.

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Il controllo in agricoltura delle malattie causate da patogeni fungini può essere effettuato attraverso l’uso di modelli di previsione che si basano comunemente sul monitoraggio in tempo reale di una serie di variabili di input. Queste informazioni generalmente combinano dati metereologici locali con modelli matematici costruiti allo scopo di predire il rischio di malattie. Il processo decisionale si attiva quando un avvertimento sul potenziale rischio viene riconosciuto da parte dei modelli. Diversi modelli epidemiologici sono stati sviluppati e validati nel mondo. Negli Stati Uniti d’America, ad esempio, l’università della California ha sviluppato un supporto decisionale on-line per gestire la coltura secondo i principi della lotta integrata (Integrated Pest Management - IPM). Ciascun agricoltore può consultare il proprio database informativo e prendere decisioni sui trattamenti da effettuare basandosi su dati sito-specifici. Le difficoltà sorgono quando non sono disponibili dati meteorologici da stazioni poste nelle vicinanze del sito in studio o per le zone montane caratterizzate da una forte variabilità altimetrica. Inoltre i dati meteorologici disponibili possono presentarsi in formato non adeguato rispetto alle esigenze del modello previsionale. Con l’intento di avere una visione regionale e una maggiore accuratezza nella gestione del controllo delle malattie, l’obiettivo della tesi è stato l’utilizzo contemporaneo di modelli epidemiologici (Lobesia botrana e Erysiphe necator, agente causale dell’oidio della vite) con modelli fenologici (cultivar di vite Chardonnay) utilizzando parametri meteorologici come la temperatura per creare mappe a livello regionale, a frequenza giornaliera e con una risoluzione spaziale di 200 metri. L’utilizzo contemporaneo di entrambi i modelli aiuta ad essere più precisi nel consigliare interventi colturali nel periodo di sensibilità dell’ospite nei confronti del patogeno o della malattia in modo da poterne stimare il reale rischio di diffusione o insorgenza. Dopo aver calibrato e validato i modelli in Trentino-Alto Adige (Nord Italia) con dati metereologici locali, basandoci sul modello del cambiamento climatico HadAM3 dell’Hadley Centre (Pope et al., 2000),l’andamento climatico previsto è stato proiettato e statisticamente portato. in scala, utilizzando lo scenario A2 e B2. L’algoritmo statistico utilizzato per ridurre la scala giornaliera di risoluzione è chiamato “transfer function” (Eccel et al., 2009). Per completare l’analisi, è stato inoltre utilizzato lo scenario ridimensionato di ENSEMBLES attraverso l’uso di set di dati provenienti da 49 stazioni meteorologiche della FEM e dal pacchetto “RMAWGEN” (Cordano et al., 2012) creato con il software statistico R. (Gentleman et al., 1997). Per mappare i modelli è stata sviluppata una semplice piattaforma modulare WEB-GIS chiamata ENVIRO. I moduli sono “Open Source” e seguono gli standard internazionali dell’“Open Geospatial Consortium” (OGC) e sono stati implementati come segue: i) enviDB è il database per i dati spazio-temporali, ii) enviGRID permette agli utenti di navigare attraverso i dati e i modelli nello spazio e nel tempo, iii) enviMapper è l’interfaccia web per prendere le decisioni, consiste in uno stato dell’arte per mappare la vulnerabilità del cambiamento climatico a diverse scale di aggregazione nello spazio e nel tempo, iv) enviModel è l’interfaccia web per i ricercatori a cui viene fornita una piattaforma per processare e condividere modelli di rischio ambientali utilizzando il “web processing Technologies” (WPS) seguendo gli standard OGC. Con l’obiettivo di diventare ancora più accurati nelle previsioni dei volumi per i trattamenti contro insetti e malattie, in accordo con la direttiva 2009/128/EC, il seguente lavoro dimostra che il sensore LIDAR può essere utilizzato per caratterizzare la geometria della pianta della vite e stimare l’area fogliare (LAI) ad ogni stadio di crescita. Inoltre permette di calcolare il volume da applicare (Tree Row Volume -TRV) visualizzato nelle mappe 3D in GRASS. (Neteler et al., 2008, Neteler et al., 2012).
Control of agricultural pests and diseases is often based on forecasting models commonly based on real time monitoring of inputs variables. This information generally combines meteorological local databases and mathematical models designed to forecast pest and disease risk. The decision process starts when an alert or a potential risk event from the outputs of the models is issued. Epidemiological models based on local datasets have been created and validated worldwide, for example in USA, the University of California developed the online Integrated Pest Management (IPM) program where each farmer can consult with his own database and make the pest management decision based on site-specific conditions. Difficulties arise when no data from a close weather station are available, in mountain areas where weather conditions highly depend on the altimetry, or if data are not in a standard format to feed the model. In a view of having a regional vision and an increased accuracy in the pest control management, the goal of this thesis was to run contemporaneously epidemiological (the pest Lobesia botrana and the pathogen causing Powdery mildew Erysiphe necator) and phenological models (grapevine cv. chardonnay) using environmental variables as temperature and to create maps at regional level, with 200 meters of resolution and daily scale or frequency. Running both models together helps to be more precise in the sensibility period of the host versus the pest or the disease and to understand the real final risk. After calibrating and validating the models in the Trentino-Alto Adige Region (Italy) with local weather data, the forecasted climate was projected and statistically downscaled, based on the output of the Hadley Centre climate model - HadAM3 (Pope et al., 2000) under scenarios A2 and B2. The statistical downscaling algorithm was “transfer function method” (Eccel et al., 2009) at daily resolution. In order to complete the analysis, the downscaled scenario from ENSEMBLES was also used with the datasets of 49 weather stations from FEM and the “RMAWGEN” packages (Cordano et al., 2012) created for this project in R statistical open source software (Gentleman et al., 1997). In order to map the models, a friendly modular WEB-GIS platform called ENVIRO was developed. Modules are Open Source, follow international Open Geospatial Consortium (OGC) standards and were implemented as follows: i) enviDB is the database for spatial temporal data, ii) enviGRID allows users to navigate through data and model in space and time, iii) enviMapper is the web interface for decision makers, a state of the art client to map vulnerability to climate change at different aggregation scales in time and space; finally, iv) enviModel is the web interface for researchers that provides a platform to process and share environmental risk models using web geo-processing technologies (WPS) following OGC standards. With the aim of being even more accurate in pests and diseases spraying volumes and according with the Directive 2009/128/EC, the current work shows that the LIDAR sensor can be used to characterize the geometry of the grapevine and the Leaf Area Index (LAI) at each growth stage and calculate the Tree Row Volume (TRV) visualized in 3D maps in GRASS (Neteler et al., 2008, Neteler et al., 2012).

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Dobby, Margaret. "Le Motet et l’Arbre de Jessé. Les pièces à deux voix sur la teneur FLOS FILIUS EJUS dans le codex W2." Thesis, Poitiers, 2012. http://www.theses.fr/2012POIT5015/document.

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Les motets du XIIIe siècle chantés sur le répons Stirps Jesse forment l'apogée d'une tradition exégétique, iconographique et musicale plus connue sous le nom d'« arbre de Jessé ». Le répons, attribué à Fulbert de Chartres (mort en 1028), évoque de façon métaphorique les liens entre Marie et son Fils. Il rappelle ainsi un des fondements du dogme chrétien : l'Incarnation charnelle de Dieu par l'intermédiaire de la Vierge. Son utilisation dans les motets n'est donc pas anodine. Le Stirps Jesse, ou plus fréquemment la seconde partie de son verset FLOS FILIUS EJUS, a été repris et ordonné de façon rythmique pour servir à la création d'une polyphonie textuelle et musicale. La voix empruntée ou teneur détermine ainsi la mélodie, la longueur des phrases mélodiques et des vers du double. Pourtant, malgré ces contraintes et les nombreux contrafacta, l'étude démontre l'existence de liens structurels entre texte et musique dans les motets à deux voix sur FLOS FILIUS EJUS conservés dans le manuscrit W2. Les relations entre texte et musique reposent ainsi le plus souvent sur la coïncidence entre la disposition des poèmes et l'organisation des répétitions motiviques (colores), des registres et des rythmes
Thirteenth-Century motets composed on the response Stirps Jesse belong to a great exegetical, iconographical and musical tradition well-known as the « Tree of Jesse ». The response, which is possibly composed by Fulbert of Chartres (d. 1028), express the relationships between Mary and her Son. It calls to mind one of the most important Christian believes as the flesh Embodiment of God thanks to the Virgin which is one of the most important Christian dogmas. The Stirps Jesse, or more often the second part of the verse FLOS FILIUS EJUS, is rhythmically organized in order to create a textual and musical polyphony. The melody, the lengths of musical phrases and of the line of the upper part depend intimately on this quotation or tenor. Even if the tenor is of great influence on the polyphony, this study demonstrates that the textual structure of the upper part corresponds to the musical organization in the two-part motets on FLOS FILIUS EJUS in the manuscript W2. The relationships between poem and melody are built on the close connection between the structural organization of the text and of the melody thanks to the melodic patterns (colores), register and rhythms

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Serrano, Dafne Isaac. "Effect of Evapotranspiration Rate on Almond Yield in California." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1955.

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Since 2011, California has been under drought conditions. These conditions have not only affected water availability for farmers, but also production. California’s second most valuable crop, almonds, has been affected by drought conditions. This study used three models (Model 1-3) to describe almond yield variability from year to year and almond yield variability within a year in Kern County, CA. The study evaluated 185 almond farms that were classified in three locations (east side, west side and north west side). The years of the study were 2011 (wet year) and 2013-2015 (drought condition years). Model 1 determined a functional regression between almond yield and annual evapotranspiration during the 4 years of the study. The R2was 7.9%, meaning low association between both variables and high unexplained variability (92.1%). Model 2 evaluated year to year variation. A regression function between almond yield and annual evapotranspiration after adjusting for location, precipitation, chilling hours and year was made. The R2of this model 62.6%, and all the variables used had a p2was higher than Model 1; however, there was high unexplained variability (47.4%). Model 3 evaluated within-year variation. A regression function between almond yield and annual evapotranspiration after adjusting for tree age and location (east, west and northwest side) was made for each year (2011 and 2013 -2015). Coefficient of variation of evapotranspiration and soil available water storage were analyzed as additional variables in Model 3; however, they were not introduced in Model 3 due to the low increase in R2 in each year (2 of Model 3 for each year were, 60.4%, 49.7%, 53.8% and 53.2% for the years 2011, 2013-2015, respectively. Model 3 also had high unexplained almond yield variability in each year (39.6%-50.3%). This high unexplained variability leads to introduce additional variables to the functional regression model for further studies. Identifying these additional variables and having a functional regression model with high R2 would lead to understand howlow evapotranspiration could potentially lead to a positive response on yield in drought conditions; thus, making farmers improve water use efficiency and hence, lowering production cost. However, the high unexplained variability clearly indicates that evapotranspiration is only one of many factors that influence yield. If improved yield is an important outcome, future studies must examine large- scale almond-producing farms with multiple agricultural system variables.

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Bon, Marie-Claude. "Aspects biochimiques du clonage de sequoias geants (sequoiadendron giganteum buchholz) jeunes et ages." Clermont-Ferrand 2, 1988. http://www.theses.fr/1988CLF21076.

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L'efficacite de la micropropagation du sequoia geant demeure conditionnee par l'etat de juvenilite des explants, sous la dependance de l'age physiologique. La synthese des analyses proteiques en tenant compte de l'influence des parametres physiologiques et genotypiques permet de proposer une proteine membranaire de 16000 daltons (j16) comme marqueur du degre de juvenilite ou par corollaire de maturite, renseignant notamment sur les potentialites organogenes de reactivite des explants en vue du clonage conforme

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Pazúriková, Jana. "Adaptivní model pro simulaci znečištění ovzduší." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2012. http://www.nusl.cz/ntk/nusl-236487.

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Air pollution harms the environment and human welfare. Computer models and their simulation are useful tools for deeper understanding of processes behind as they quite accurately represent the dispersion and transformation of pollutants with advection diffusion equation or by other concepts. Current models give valid results only to constrained cases of initial conditions. The general model combining the several specific models which is able to change according to input parametres and improve with training is proposed. The adaptiveness of the system is provided by decision tree as data structure with information for selection and combination process and genetic algorithm as optimization method for adjusting the tree. The evaluation of implemented system proves that the combination of models gives better results than models themselves. Even with simple specific models, the system has achieved results comparable to state-of-art models of air pollution.

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Lundquist, Kristin. "Vildsvinsbök i skogsmark – en studie i tre områden i Mellansverige." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-32034.

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I april-juli år 2010 undersöktes tre studieområden i mellersta Sverige avseende hur fördelningen av vildsvinsbök såg ut i dessa områden. Resultaten visade att vildsvinsbök främst återfanns i miljöer dominerade av tall-och granskog där åldern på träden låg runt 45-90 år, samt med fältskikt bestående av bärris, mossa eller gräs. På två utav de tre lokalerna påverkades inte arealen på bök av faktorer såsom trädartsammansättning, trädålder eller fältskikt men det fanns däremot korrelationer mellan dessa faktorer på en utav lokalerna. Vidare påverkades arealen på bök inte av populationstäthet eller hur lång tid vildsvin förekommit i området.
In April-July in 2010, three forest dominated areas in central Sweden were studied to investigate wild boar rooting habits. The results showed that rooting mainly occurred in pine-and spruce dominated habitats where tree-ages varied between 45-90 years old and with ground surface vegetation consisting of shrubs (blueberry/lingonberry), mosses and grass. In two of the three study areas the size of rooted areas was not affected by factors such as tree species composition, forest age or vegetation ground cover, but correlations between these factors were found in one of the areas. The size of rooted areas was not affected by the population density or the time with wild boar present in the area.

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Suliman, Tammam [Verfasser], Uta [Gutachter] Berger, der Maaten-Theunissen Mareike [Gutachter] van, and Wael [Gutachter] Ali. "Understanding the dynamics of even-aged stands of Brutia pine (Pinus brutia Ten.) in the coastal region of Syria based on a distance-independent individual-tree growth model / Tammam Suliman ; Gutachter: Uta Berger, Mareike van der Maaten-Theunissen, Wael Ali." Dresden : Technische Universität Dresden, 2020. http://d-nb.info/1227833695/34.

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Dissertations / Theses on the topic 'Age of trees'

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