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Dissertations / Theses on the topic 'Forest soil trophism index'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Zhao, Yihai (Simon). "Relative bulk density as an index of soil compaction and forest productivity in British Columbia." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/10318.

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Soil compaction often limits conifer regeneration on sites degraded by construction of landings and roads, but inadequate understanding of compaction characteristics has sometimes led to inappropriate rehabilitation efforts. This warrants development of new methods to assess compaction and its relation to tree growth. The objective of this study was to develop a high-level integration indicator that will characterize compaction of forest soils and that could be correlated to tree height growth. Mineral particle density of soils from interior British Columbia (BC) forests varied significantly a

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2

Burger, Mark Allen. "A wetland trafficability hazard index based on soil physical properties and site hydrology evaluations." Thesis, Virginia Tech, 1994. http://hdl.handle.net/10919/42629.

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Harvesting of forested wetlands in the Atlantic and Gulf lower coastal plains has the potential to cause intense site disturbance. Often, as a result of poor pre-harvest planning, silvicultural activities are performed on wetland soils highly susceptible to rutting and puddling. Potential decreases in pine productivity have been connected with increased soil strength and decreased aeration that are commonly remnants of site disturbances associated with wet-weather harvesting. A simple and economical rating system is needed to identify soils susceptible to disturbance by various types of equipm

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3

Klinka, Karel, Pal Varga, and Christine Chourmouzis. "Quantitative characterization of field-estimated soil nutrient regimes in the coastal forest." Forest Sciences Department, University of British Columbia, 1999. http://hdl.handle.net/2429/702.

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One of the key factors in the site classification of the biogeoclimatic ecosystem classification is soil nutrient regime. Soil nutrient regime (SNR) represents the amount of essential soil nutrients available to plants over a period of several years. SNRs classes are assessed based on field identifiable (qualitative) criteria, not using quantitative measures. There have been several studies that attempted to quantitatively characterize regional soil nutrient gradients in the Coastal Western Hemlock (CWH) zone. In the study summarized here, the soils are influenced by a perhumid cool mesotherma

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4

Klinka, Karel, Bernhard E. Splechtna, and Christine Chourmouzis. "Quantitative characterization of field-estimated soil nutrient regimes in the subalpine coastal forest." Forest Sciences Department, University of British Columbia, 1999. http://hdl.handle.net/2429/759.

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Site classification in the biogeoclimatic ecosystem classification system is based on three differentiating properties: climatic regimes (expressed by biogeoclimatic subzones or variants), soil moisture regimes (SMRs), and soil nutrient regimes (SNRs). A SNR represents a segment of a regional soil nutrient gradient, i.e., soils which provide similar levels of plant-available nutrients over a long period. SNRs are identified in the field using a number of easily observable soil morphological properties and indicator plant species. However, we need to know to what extent soil nutrient propertie

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5

Klinka, Karel, Han Y. H. Chen, and Christine Chourmouzis. "Quantitative characterization of field-estimated soil nutrient regimes in the subalpine interior forest." Forest Sciences Department, University of British Columbia, 1999. http://hdl.handle.net/2429/716.

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Site classification of the biogeoclimatic ecosystem classification system is based on climatic regime (expressed by biogeoclimatic subzone), soil moisture regime (SMR), and soil nutrient regime (SNR). A SNR represents a segment of a regional soil nutrient gradient, i.e., a population of soils which provide similar levels of plant-available nutrients over a long period. SNR is identified in the field using a number of easily observable soil morphological properties and indicator plant species. However, we do not know the extent to which soil nutrient properties are supported by these indirect

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6

Klinka, Karel, R. E. (Reid E. ). Carter, and Christine Chourmouzis. "Relationships between coastal Douglas-fir site index and synoptic categorical measures of site quality." Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/682.

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Knowledge of ecological characteristics of trees, sites and tree growth on different sites is fundamental for silvicultural decision-making and planning. With the biogeoclimatic ecosystem classification in place, silvicultural management in British Columbia has been given an ecological foundation; however, relationships between growth and site have not yet been fully investigated. The purpose of this study was to determine how height growth of Douglas-fir within the drier portion of the CWH zone varies with site. We adopted site index (m @ 50 yr bh) as a species-specific measure of forest p

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7

Klinka, Karel, Gordon J. Kayahara, and Christine Chourmouzis. "Relationship of site index to estimates of soil moisture and nutrients for western redcedar in south coastal British Columbia." Forest Sciences Department, University of British Columbia, 1997. http://hdl.handle.net/2429/765.

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Where timber production is the primary management objective, knowledge of the relationship between the potential productivity of candidate tree species and levels of light, heat, nutrient, moisture and aeration is necessary for species- and site-specific decision making. For example, foresters need to decide which tree species to regenerate on a particular harvested area to obtain maximum sustainable productivity. Similarily, when considering the application of silvicultural treatments such as spacing or fertilizing, foresters need to determine whether the potential productivity of a particul

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8

White, William Patrick. "Soil moisture, fire, and tree community structure." Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1301936875.

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9

Klinka, Karel, R. E. (Reid E. ). Carter, Qingli Wang, and M. C. (Michael Charles) Feller. "Influence of salal on height growth of coastal douglas-fir." Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/677.

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The influence of salal on tree growth has attained considerable attention in coastal British Columbia. Field observations, surveys, and studies in the CWH zone have indicated poor growth performance of crop tree species in salal-dominated plantations and natural immature and old-growth stands. Where sites have been burned and planted, tree growth has improved; similar effects have been observed for naturally regenerated stands. Immature stands that developed after wind disturbance or harvesting feature rapid growth and nearly complete absence of salal. As studies have shown that ericaceous pla

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10

Chikumbu, Vavariro. "Growth responses to fertilizer application of thinned, mid-rotation Pinus radiata stands across a soil water availability gradient in the Boland area of the Western Cape." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17828.

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Thesis (MscFor)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: The purpose of the study was to investigate the effect of mid rotation fertilizer application on leaf area index (LAI), basal area and volume increment in thinned Pinus radiata stands on the most common soils of the Boland region in the Western Cape. The study was conducted on a range of sites in the Boland region of MTO Forestry Company, chosen to reflect the two most common soil types and a water availability gradient in each soil type. A factorial combination of fertilizer treatments with three levels each for nitrog

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11

Zinko, Ursula. "Plants go with the flow : predicting spatial distribution of plant species in the boreal forest." Doctoral thesis, Umeå : Ekologi och geovetenskap, Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-315.

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12

Danielsson, Joakim, and Björkman Emilie. "Kan digitala hjälpmedel användas förmer ståndortsanpassade föryngringar?" Thesis, Linnéuniversitetet, Institutionen för skog och träteknik (SOT), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-85578.

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The aim of this study was to investigate if SI from HPR-data from harvesters and soil moisture classes from digital depth to water maps could be used to support site adaption of regenerations within stands. The study was made on pine and spruce stands in central Sweden. The number of plants/ha, plant height, growth and damage were measured at plot level and for these plots also soil moisture classes and SI were derived from digital maps and HPR. The study shows a potential using SI from HPR and depth to water maps for site adaption of regenerations and to vary tree species within stands. Varia

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13

Lemos, Cristiane Camargo Zani de. "Aprimoramentos, teste e uso do modelo 3-PG em plantios clonais de Eucalyptus no nordeste do estado de São Paulo." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/11/11150/tde-17042012-104621/.

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O 3-PG (Physiological Principles in Predicting Growth) é o modelo ecofisiológico mais difundido no setor florestal para a predição de crescimento de florestas. Este modelo estima o crescimento florestal com base na radiação fotossinteticamente ativa absorvida pelo dossel, convertida em carboidratos, e alocada nos compartimentos da floresta (folhas, tronco, galhos e raízes), fundamentados na dinâmica dos processos biológicos e suas interações com o clima e solo. No entanto, após quase 15 anos de existência do 3-PG unido a evolução em pesquisa florestal, é possível detectar alguns pontos no mode

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14

Klippel, Valéria Hollunder. "Avaliação de métodos de restauração florestal de Mata Atlântica de Tabuleiros." Universidade Federal do Espírito Santo, 2011. http://repositorio.ufes.br/handle/10/5807.

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Made available in DSpace on 2016-12-23T13:51:52Z (GMT). No. of bitstreams: 1 Valeria Hollunder Klippel.pdf: 1679011 bytes, checksum: 81fc92fdc0af96774ee580cab6eba66b (MD5) Previous issue date: 2011-07-25<br>This study aimed to evaluate different forest restoration methods of a Tableland Forest, by manipulating the floristic composition and silvicultural practices. With this foundation, it was installed in August of 2007, at the Reserva Natural Vale (RNV) in Linhares - ES, an experiment in randomized blocks with 4 treatments and 3 replications (a total of 12 plots): T1 (Control): Only leafcut

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15

SOUTHEE, FLORENCE MARGARET. "Ecological land classification and soil moisture modelling in the boreal forest using LiDAR remote sensing." Thesis, 2010. http://hdl.handle.net/1974/6244.

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Ecological land classification (ELC) is used to classify forest types in Ontario based on ecological gradients of soil moisture and nutrient fertility determined in the field. If ELC could be automated using terrain surfaces generated from airborne Light Detection and Ranging (LiDAR) remote sensing, it would enhance our ability to carry out forest ecosite classification and inventory over large areas. The focus of this thesis was to determine if LiDAR-derived terrain surfaces could be used to accurately quantify soil moisture in the boreal forest at a study site near Timmins, Ontario for use

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16

Chakraborty, Tanmoy. "Multi-scale assessment of drought-induced forest dieback." Master's thesis, 2020. http://hdl.handle.net/10362/94403.

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Dissertation submitted in partial fulfilment of the requirements for the degree of Master of Science in Geospatial Technologies<br>Drought has been intensified over the years and will continue to worsen due to climate change. Existing works have focused their attention on crops rather than forests. Adverse effects are felt by all flora and fauna but the impact of the recent droughts on forest ecosystems is still unknown. Greater root depth allows them to withstand the immediate impacts of drought in contrast to crops and other vegetation. This study aims to see not only the interaction between

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17

Krämer, Inga. "Rainfall partitioning and soil water dynamics along a tree species diversity gradient in a deciduous old-growth forest in Central Germany." Doctoral thesis, 2009. http://hdl.handle.net/11858/00-1735-0000-0006-B692-C.

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18

Bravo, Dianne. "Effects of high groundwater nitrate inputs on riparian conifer forest growth and associated plant-soil interactions /." 2006. http://proquest.umi.com/pqdweb?index=0&did=1240698881&SrchMode=1&sid=8&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1195137688&clientId=5220.

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Thesis (M.Sc.)--York University, 2006. Graduate Programme in Geography.<br>Typescript. Includes bibliographical references (leaves 72-80). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://proquest.umi.com/pqdweb?index=0&did=1240698881&SrchMode=1&sid=8&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1195137688&clientId=5220

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19

(8300103), Shams R. Rahmani. "Digital Soil Mapping of the Purdue Agronomy Center for Research and Education." Thesis, 2020.

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This research work concentrate on developing digital soil maps to support field based plant phenotyping research. We have developed soil organic matter content (OM), cation exchange capacity (CEC), natural soil drainage class, and tile drainage line maps using topographic indices and aerial imagery. Various prediction models (universal kriging, cubist, random forest, C5.0, artificial neural network, and multinomial logistic regression) were used to estimate the soil properties of interest.

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20

El-Amine, Mariam. "Contrôles environnementaux de la variabilité interannuelle de la reprise et de la fin de la photosynthèse au sein de la forêt boréale nord-américaine." Thesis, 2020. http://hdl.handle.net/1866/25455.

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Le biome boréal, emmagasinant d’importantes quantités de carbone en son sol et recouvrant une majorité du territoire alaskien, fennoscandien et russe, contribue grandement au système climatique. Toutefois, les variabilités climatiques et les propriétés de l’écosystème, notamment en ce qui a trait à la présence ou l’absence de pergélisol, complexifient la quantification de la variabilité des bilans de carbone du biome boréal, au sein duquel se retrouvent des écosystèmes forestiers, lentiques et de zones humides. Ces bilans de carbone sont grandement influencés par le début et la fin de la s

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