Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"diameter increment"”.
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Diameter and height increment and mortality functions for loblolly pine trees in thinned and unthinned plantations
… height of dominant and co-dominant trees and a diameter increment model were developed to incorporate the thinning response variable. New fits of height increment and mortality functions to the available data were also completed. Separate mortality functions were fit to data from unthinned and …
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Growth Models and Mortality Functions for Unthinned and Thinned Loblolly Pine Plantations
Effects of thinning, such as increased diameter growth and decreased mortality in the residual stand, have been recognized by foresters for many years. These effects are largely the result of increased tree vigor which is induced by a decreased level of competition. These relationships are …
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Incorporating Climate Sensitivity for Eastern United States Tree Species into the Forest Vegetation Simulator
… for site index, individual-tree mortality and diameter increment were addressed separately, which were all developed using Random Forests on the basis of USDA Forest Service Forest Inventory and Analysis program linked to contemporary climate data and soil properties mapped in the USDA Soil …
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Methods for modeling whole stem diameter growth and taper
… and taper to be the rate of narrowing in diameter given a tree form. Ormerod's stem profile model was selected as the basic model since its parameters were readily interpretable in terms of Gray's taper and form definitions. Two stage modeling procedures were used to relate individual tree …
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Tree Growth and Carbon Balance in a Temperate Forest Exposed to Elevated Carbon Dioxide for Eight Years
… stems was found to correlate with annual tree diameter increment. The interpretation of this result was complicated by the significant contribution of soil derived CO2 to the measured stem efflux. Isotopic measurements indicated that stem CO2 efflux was a mixture of both soil CO2 and …
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The impact of ozone, water stress, and acid rain on the growth and physiology of fraser fir seedlings
… changes in biomass accumulation, height, or diameter increment over the ten week period of the study. A solution of pH 3.0 did result in significantly higher root surface area and significantly reduced Ts after 5 wks of exposure; these responses are possibly due to a fertilization effect. No …
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Testing methods for calibrating Forest Vegetation Simulator (FVS) diameter growth predictions
… depends a great deal on the performance of the diameter increment model and its predictions of change in diameter at breast height (DBH) over time. To address the challenge of predicting growth in highly variable and geographically expansive forest systems, FVS was designed to include an …
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Water balance and productivity of a Mediterranean oak woodland : Quantifying understory vegetation impacts by development of a stable oxygen isotope partitioning approach
… alterations in tree phenology: annual tree diameter increment and fruit production were severely reduced. These findings suggest that the herbaceous understory, although vulnerable to drought, plays a vitally important role for ecosystem fluxes, rain infiltration and hence also cork-oak …
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Model-based analysis of climate change impacts on the productivity of oak-pine forests in Brandenburg
… of severe drought as a main reason for small diameter increment, best supported by the mechanistic water uptake approach with high root resistance. However, if all aspects of the data sets are considered no approach can be judged superior to the other. I conclude that the uncertainty of future …
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MODELLING THE GROWTH OF THE LOGGED OVER INLAND PRODUCTION FORESTS OF PENINSULAR MALAYSIA WITH FOREST MANAGEMENT CONSIDERATION
… understorey or C, D and E strata), mature tree diameter size (very large, large. medium and small) and wooti characteristics (light heavy hardwood, medium heavy hardwood anti heavy hardwood). These are stantlartl characteristics used in Malaysia to describe species physical characteristics, and …
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Modelos silvopascícolas en sistemas adehesados del oeste de la Península Ibérica
… de la edad. Además, se ajustaron ecuaciones de incremento en diámetro, donde se compararon también formulaciones dependientes e independientes de la edad, y se discutió el efecto de la competencia en rodales de baja densidad como los de las dehesas. La selección de la densidad en los modelos de …