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Dissertations / Theses on the topic 'Vegetation elements'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Ji, Jinnan. "Finite elements modelling and analysis of the effect of vegetation on forested slopes stability." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20213.

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L'ingénierie écologique, qui est décrite comme «la gestion de la nature», a d'abord été proposée par Odum en 1971. Dans les dernières décennies, l'ingénierie écologique a été largement consacrée à lutter contre l'érosion des sols et les mouvements de masse, tout en permettant d'assurer la durabilité des écosystèmes. L'objectif de cette thèse est d'évaluer l'impact de peuplements forestiers sur la stabilité de pentes de dimension finie, en considérant à la fois les effets mécaniques et hydrologiques des racines peu profondes contre les glissements de terrain. Deux sites forestiers monospécifiqu

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2

Adler, Anneli. "Accumulation of elements in Salix and other species used in vegetation filters with focus on wood fuel quality /." Uppsala : Dept. of Crop Production Ecology, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200706.pdf.

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3

Yalaltdinova, Albina. "Elemental Composition of Vegetation as an Indicator of Technogenic Influence in Ust-Kamenogorsk City." Thesis, Troyes, 2015. http://www.theses.fr/2015TROY0029/document.

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L’accroissement de l’urbanisation et le développement industriel modifient la composition des géosphères de la Terre, en augmentant le nombre de problèmes géoécologiques et en affectant négativement la santé humaine. Actuellement, plus d'attention est accordée à la surveillance de l'état des composants de l’environnement naturel urbain. En Russie, les méthodes biogéochimiques (par ex., l'application de feuilles des arbres comme un récepteur naturel de la pollution) sont largement utilisées pour caractériser les problèmes géoécologiques des territoires dans des conditions d’intensité d’activité

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4

Mazaltarim, Daniel. "Geochimie des cuirasses ferrugineuses et bauxitiques de l'afrique occidentale et centrale." Université Louis Pasteur (Strasbourg) (1971-2008), 1989. http://www.theses.fr/1989STR13090.

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Dans les pays tropicaux d'afrique ou regnent des climats chauds et humides, le substratum rocheux est separe de la surface par une epaisse couverture lateritique, parfois coiffee d'un niveau tres riche en fer et indure appele cuirasse. Le but de ce travail est, sur la base d'un modele d'enfoncement vertical des paysages lateritiques, de comprendre par quels mecanismes les caracteres chimiques, mineralogiques ou texturaux des materiaux parentaux peuvent se perpetuer ou disparaitre au cours de l'alteration. La prospection geochimique des ressources minerales du substratum rocheux des pays d'afri

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5

Ma, Yamin. "Vegetation as a biotic driver for the formation of soil geochemical anomalies for mineral exploration of covered terranes." University of Western Australia. School of Earth and Geographical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0235.

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[Tuncated abstract] Soil is a relatively low cost and robust geochemical sampling medium and is an essential part of most mineral exploration programs. In areas of covered terrain, however, soils are less reliable as a sampling medium because they do not always develop the geochemical signature of the buried mineralisation; possibly a result of limited upward transport of ore related elements into the surficial overburden. As economic demands on the resources industry grow, mineral exploration continues to expand further into areas of covered terrain where the rewards of finding a new deposit

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6

Le, Coeur Didier. "La vegetation des elements lineaires non cultives des paysages agricoles : identification a plusieurs echelles spatiales, des facteurs de la richesse et de la composition floristiques des peuplements." Rennes 1, 1996. http://www.theses.fr/1996REN10125.

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Les elements lineaires non cultives (haies, talus, fosses), constituent, au sein des paysages agricoles, des reseaux caracterises par des peuplements vegetaux et animaux originaux par rapport a ceux de l'espace cultive. Dans le contexte des nouvelles fonctions de l'agriculture, et compte tenu des engagements internationaux en faveur de la biodiversite, il devient urgent de fournir aux amenageurs les bases scientifiques du maintien de la diversite biologique en zone agricole. L'objectif de ce travail est d'identifier les facteurs impliques dans le controle de la diversite des peuplements vegeta

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7

Janse, van Rensburg Unique. "Quantification of potential elemental impact of a munitions production and testing facility on its immediate surroundings / Unique Janse van Rensburg." Thesis, North-West University, 2010. http://hdl.handle.net/10394/4575.

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The study attempted to quantify the elemental concentrations and possible accumulation levels in the antelope's organ tissue at Rheinmetal Denel Munitions (RDM), as well as to correlate the findings with the surrounding environment. To achieve this, the elemental concentrations within the kidney, liver and lung tissue of the antelope, and environmental factors such as the soil, vegetation and waterholes were quantified. STATISTICA was used to determine meaningful differences between variables and Canoco to determine the relationship between the different datasets. PCA analyses of the vegetatio

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8

Nilsson, Torbjörn. "Wood ash application effects on elemental turnover in a cutover peatland and uptake in vegetation /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-6092-1.pdf.

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9

Almeida, Ezequias Barbosa de. "Análise integrada de elementos da paisagem da Serra do Tepequém por meio de dados de sensoriamento remoto e de campo." Universidade Federal de Roraima, 2014. http://www.bdtd.ufrr.br/tde_busca/arquivo.php?codArquivo=299.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>O norte do estado de Roraima é caracterizado por apresentar características importantes nos elementos da paisagem. Esses atributos naturais têm proporcionado à região avanços importantes nas áreas de pesquisas e turismo. Este estudo tem por objetivo analisar a relação da distribuição tipológica da fitofisionomia x relevo e fitofisionomia x pedologia no topo da serra, através da utilização de dados de Sensoriamento Remoto, compartimentação geomorfológica, classes dos solos e dados de campo. Para alcançar esses objetivos foi utilizad

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10

Rydberg, Johan. "Studies of an elusive element : processes that influence the net retention of mercury in lake sediments and peatlands." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-38424.

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Because of its toxic nature mercury is a threat to both wildlife and human health, and thus, it is an element of concern in the environment. Currently much of the mercury emitted to the atmosphere is derived from anthropogenic sources – both direct emissions and re-emission of already deposited anthropogenic mercury. Following deposition mercury is affected by a long array of processes, and this thesis has focused on trying to increase our knowledge on the net retention of mercury in lake sediments and peatlands. This information is vital in order to understand how mercury behaves in the envir

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11

Scotta, Fernando Comerlato. "Análise da influência dos elementos do clima na vegetação campestre da Depressão Central, bioma Pampa, utilizando dados de campo e de sensoriamento remoto orbital." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/76137.

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Esse trabalho analisou a influência dos elementos do clima na vegetação campestre da Depressão Central do Rio Grande do Sul, bioma Pampa, utilizando dados de campo e de sensoriamento remoto orbital. Para a análise do clima, foi utilizada uma estação meteorológica localizada no município de Eldorado do Sul. Foram utilizados os dados mensais de temperatura do ar (mínima, média e máxima), precipitação pluvial acumulada e evapotranspiração acumulada para o período de 1970-2011. Para analisar a vegetação, dados em escala local e regional foram utilizados. Para a análise em escala local, dados de Pr

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12

Tulyananda, Tatpong. "Vegetative Anatomy of Rhododendron with a Focus on a Comparison between Temperate and Tropical Species." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/82508.

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Rhododendron is a monophyletic group that inhabits many different climates. One clearly defined diversification was from temperate ancestors into tropical habitats. The focus of this work was to explore leaf and stem anatomical traits in relation to habitat (temperate and tropical) and elevation of the native range. A closely-related group of Rhododendron was selected to reduce variation in genetic history and reveal environment–associated adaptive traits. Vessel anatomical traits of Rhododendron accessions were assayed for the trade of between safety (protection against catastrophic fail

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13

Liang, Teng. "Seismic performance of vegetated slopes." Thesis, University of Dundee, 2015. https://discovery.dundee.ac.uk/en/studentTheses/04c95230-9768-4c0a-8b8a-b32081d039a9.

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14

COULLET, FRANCOISE. "Elements de reflexion a propos des patients en survie vegetative : a partir de 14 dossiers de coma anoxique pris en charge dans des services d'urgence medicale entre 1985 et 1992." Lyon 1, 1993. http://www.theses.fr/1993LYO1M285.

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15

Chopin, Edith I. B. "Investigation of the factors controlling trace element distribution and transfer within the soil and vegetation systems around the ancient and modern mining and smeltlng areas of Tharsis, RiÌotinto and Huelva in south west Spain." Thesis, University of Reading, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408878.

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16

Pornon, André. "Dynamique et fonctionnement des populations de Rhododendron ferrugineum L. (éricacée) : étage subalpin ; Alpes Nord-Occidentales." Université Joseph Fourier (Grenoble ; 1971-2015), 1994. http://www.theses.fr/1994GRE10083.

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Cette etude realisee a differents niveaux de perception (du peuplement a la cellule) est une contribution a une meilleure connaissance du fonctionnement et de la dynamique des landes subalpines a rhododendron ferrugineum. Dans la premiere partie, l'analyse diachronique permet de replacer la dynamique des populations de rhododendron dans un contexte global de developpement des communautes vegetales a l'etage subalpin des alpes nord-occidentales. Dans la seconde partie, l'etude demographique realisee dans une sequence pelouselande ouvertelande fermee montre que le temps necessaire pour que l'arb

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17

Chéret, Véronique. "La sapiniere du luchonnais (pyrenees hautes-garonnaises) : etude phytoecologique, recherches sur le phenomene de deperissement forestier." Toulouse 3, 1987. http://www.theses.fr/1987TOU30042.

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Un phenomene de deperissement du sapin (abies alba m. ) se developpe depuis plusieurs annees dans le luchonnais. Apres un inventaire des symptomes et une cartographie des secteurs forestiers atteints, des travaux ont ete menes dans differents domaines afin d'expliciter ce phenomene. Il ressort que le deperissement semble du a une synergie de facteurs contribuant a affaiblir progressivement la sapiniere en provoquant directement (pollutions acides, faible fertilite des sols) ou indirectement (secheresse, competition) des troubles nutritionnels

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18

Bekkaoui, Faouzi. "Microbouturage in vitro et culture de méristèmes de Douglas (Pseudotsuga menziesii) : problèmes liés à l’âge et au milieu de culture." Paris 6, 1986. http://www.theses.fr/1986PA066383.

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La multiplication des microboutures au cours des subcultures est caractérisée par une évolution de l'état physiologique qui dépend de l’âge, des réserves nutritives et du milieu de culture. Parmi les problèmes qui limitent la multiplication végétative: l'hyperhydrie et le gonflement des tiges des microboutures. Le premier est caractérisé par une teneur en eau élevée, par des rapports p/na, k/na et cytokinines/auxine élevés. Le deuxième est caractérisé par une teneur élevé en zéatine+zéatine-riboside. Les méristèmes de plantes d'âges différents ont une réactivité distincte aux niveaux morpholog

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19

Fitzpatrick, Cole D. "The Effect of Roadside Elements on Driver Behavior and Run-Off-the-Road Crash Severity." 2013. https://scholarworks.umass.edu/theses/1037.

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Roadside vegetation provides numerous environmental and psychological benefits to drivers. Previous studies have shown that natural landscapes can effectively lower crash rates and cause less stress and frustration to the driver. However, run-off-the-road crashes resulting in a collision with a tree are twice as likely to result in a fatality, thus reinforcing the need to examine the placement of vegetation within the clear zone. This study explores the relationship between the size of the clear zone and the presence of roadside vegetation on selected driver attributes, including both driver s

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20

Getahun, Yitea Seneshaw. "Spatial-temporal analyses of climate elements, vegetation characteristics and sea surface temperature anomaly. A Case study in Gojam, Ethiopia." Master's thesis, 2012. http://hdl.handle.net/10362/8320.

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Dissertation submitted in partial fulfillment of the requirements for the Degree of Master of Science in Geospatial Technologies.<br>Agriculture is the backbone of Gojjam economy as it depends on seasonal characteristics of rainfall. This study analyses the components of regional climate variability, especially La Niña or El Niño Southern Oscillation (ENSO) events and their impact on rainfall variability and the growing season normalized difference vegetation index. The temporal and spatial distribution of temperature, precipitation and vegetation cover have been investigated statistically in

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21

Durowoju, Olatunde Samod. "Trace element concentrations in geothermal springs and their impact on soil and vegetation in Siloam and Tshipise." Diss., 2015. http://hdl.handle.net/11602/336.

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MENVSC<br>Department of Hydrology and Water Resources<br>ABSTRACT Siloam and Tshipise Springs are scalding geothermal springs geologically located within the Soutpansberg Group in the Limpopo Province of South Africa. These geothermal springs are associated with faults and impermeable dykes and are assumed to be of meteoric origin. The optimal use of a geothermal spring largely depends upon its physical and chemical properties as well as the geological controls at source and surrounding pathway to the surface. This study aimed at investigating trace element concentrations in these geothermal

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22

Vlnová, Lucie. "Vývoj rozptýlené zeleně v závislosti na zavedení nástrojů zemědělské politiky a politiky ochrany přírody a krajiny." Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-332171.

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Scattered vegetation is an essential part of the landscape in the Czech Republic. It is typical mainly for farm land which has experienced deep changes during the last century, which were probably the deepest changes in the last millennium. The thesis focuses on valuation of the scattered vegetation from the fifties till present. As a reset of collectivism, land consolidation in-to large land units, grassland ploughing and disturbance of scenic elements started. These broke the ecological balance of the landscape. The priority was given to the objective of increasing agricultural production. H

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23

Liu, Yun-Ze, and 劉運澤. "Finite Element Analysis of Water Flow Passing Vegetative Channel." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/70104777610612721142.

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碩士<br>中興大學<br>水土保持學系所<br>95<br>In order to know how vegetation influences streamwise velocity of water flow passing vegetative channel, we divide the flow field into three regions: homogenous water layer (the flow over vegetation), vegetation layer (the flow inside vegetation) and permeable soil layer (the flow inside the soil), then solve the streamwise velocity by finite element analysis. The soil and vegetation are both regarded as porous media and the flow inside the two layers is porous media flow. The velocity in water layer is solved by Reynold average Navier- Stokes equation and

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24

Pretorius, Jacobus Marthinus. "Growth potential of various plant species for vegetative rehabilitation of different mine tailings / Jacobus Marthinus Pretorius." Thesis, 2015. http://hdl.handle.net/10394/16015.

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Vegetation establishment is one of the major rehabilitation methods that are used to stabilize, cover, to minimize, mitigate or remove the contaminants from tailings storage facilities (TSF’s). Phytostabilization is a useful mechanism by which plants limit the contamination of natural systems with toxic elements. For successful occurrence of phytostabilization on mine tailings, it is vital to establish plant species that can survive the hostile conditions of the substrate. Major problems encountered with vegetation covers is the lack of natural soil properties e.g. soil structure, organic carb

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25

Alfredo, von Bennewitz Alvaro Eduardo. "Effect of the application of two biopreparations on the foliar elements concentration, vegetative and generative behaviour of apple trees var.Jonagold." Doctoral thesis, 2000. http://www.nusl.cz/ntk/nusl-96027.

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26

DOHNALOVÁ, Tereza. "Zakládání a následná mechanizovaná údržba biocenter jako prvku ekologické stabilizace krajiny." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-136953.

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The work drala with the theoretical design bio-centers, the composition of vegetation in it and machanization means with which it could be bulit bio-center. The theoretical part contains the characteristics of concepts, the characteristics for which the proposed bio-center and track stands. The practical part contains procedures for setting up bio-centers, design of machinery and design of care of forests based on bio-centers.

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27

Klinck, Uwe. "Kohlenstoffvorrat, Nährstoffvorräte und Wasserdynamik nach forstlichen Eingriffen in Fichtenreinbestände." Doctoral thesis, 2009. http://hdl.handle.net/11858/00-1735-0000-0006-B12F-9.

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