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 20 of 32 for “"Tree diameter"”.
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Diameter Estimation of Eucalyptus spp. Plantations in Southern Brazil Using Global Ecosystem Dynamics Investigation Data and Support Vector Regression
… to investigate plantation metrics (height, diameter, volume, stems per hectare, etc.) and to create a model of plantation diameter using Support Vector Regression (SVR). SVR enabled a robust model of tree diameter even given the heteroskedasticity and spatial auto correlation present in the …
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Effects of host stored resources on bark beetle-fungal-conifer interactions
… degree to which host stored resources influence tree-beetle-fungal interactions has not been investigated. In western North America, the range of the mountain pine beetle (Dendroctonus ponderosae) has expanded from lower elevation Pinus contorta (lodgepole pine) forests into high elevation Pinus …
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Effects of host stored resources on bark beetle-fungal-conifer interactions
… degree to which host stored resources influence tree-beetle-fungal interactions has not been investigated. In western North America, the range of the mountain pine beetle (Dendroctonus ponderosae) has expanded from lower elevation Pinus contorta (lodgepole pine) forests into high elevation Pinus …
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Compression wood formation in Pinus strobus L. following ice storm damage in southwestern Virginia
… L.) following a severe ice storm in 1994, 47 trees were felled in 2007 and cross-sectional samples were collected at 0.5 (±0.2) m stem height. The disks were sanded and digitally scanned, and the cross-sectional area (mm2) of compression wood within each tree-ring was quantified using image …
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Influence of habitat and bat activity on moth community composition and seasonal phenology across habitat types
… and habitat structure variables, including tree diameter at breast height, ground cover, and vegetation height were measured during summer surveys to document how differences in habitat structure between and within habitats influences moth diversity. I found that moth communities vary …
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Latitudinální proměna ideálního stromu podle metabolické teorie
… allometric models can we predict a height of a tree or standing leaf biomass of the tree from a diameter of the tree? How does environment surrounding the tree influence such relationships? Does an "ideal tree" exist? I have been exploring these and also other questions using 75 Betula spp. …
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Sensitivity Analysis of the Forest Vegetation Simulator Southern Variant (FVS-Sn)for Southern Appalachian Hardwoods
… density index and, to a lesser degree, the large tree diameter growth sub-model. The testing procedures and framework developed in this study will serve as a template for further evaluation of FVS-Sn, including a comprehensive assessment of model uncertainties, followed by a recalibration for …
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Use of a Geographic Information System for Determining White-Tailed Deer Habitat Use in the Northern Black Hills of South Dakota and Wyoming
… elevation, cover type, canopy cover, basal area, tree diameter, tree volume, regrowth stem count and height, and presence of grass, forb, and shrub species. Comparisons of percent habitat composition did not detect differences (P ≥ 0.10) between home range 95% and 50% use contours, or between deer …
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Structure of Two Cover Types of Southern Oak Woodland in California
… relative to the local distribution of the trees, density per acre, relative density, relative dominance, percentage of trees growing in close association to boulders, percentage of trees forked below breast height, frequencies of tree diameter and percentage of cover. These characteristics, …
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Modeling winter habitat for white-tailed deer in southwestern Virginia
… were selected for use in the PATREC model: mean tree diameter, oak basal area, basal area of"Other Winter Forage" tree species, density of"Nonforage" shrubs, mean distance to a gated gravel road, and mean canopy closure. Spearman's rank correlations were used to compare the model outputs with …
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PILOT STUDY ON THE PREDICTION OF HEART ROT IN APPARENTLY SOUND WESTERN LARCH
Since many cavity-excavating birds require trees with heart rot, managers routinely emphasize decayed trees in their snag retention prescriptions. Where too few trees are present with obvious indicators of decay, apparently sound trees are left to meet retention objectives. These trees may also …
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PILOT STUDY ON THE PREDICTION OF HEART ROT IN APPARENTLY SOUND WESTERN LARCH
Since many cavity-excavating birds require trees with heart rot, managers routinely emphasize decayed trees in their snag retention prescriptions. Where too few trees are present with obvious indicators of decay, apparently sound trees are left to meet retention objectives. These trees may also …
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Shrinkage characteristics of lodgepole pine
… Pinus contorta var. murrayana, sampled at 10% of tree height. For var. murrayana, size was the only factor that had a significant effect on specific gravity; specific gravity decreased with increasing tree diameter. For var. Iatifolia, latitude was the only factor that had a significant effect on …
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Simulation of Early Stand Development in Intensively Managed Loblolly Pine Plantations
… Allometric equations are employed to estimate tree diameter and height-to-crown attributes. First year after planting mortality estimates are based on physiographic region and drainage class, with adjustments for bedding or discing site preparation treatments. Thereafter, a simple mortality …
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Habitat Relationships of Breeding Birds in Bottomland Hardwood Forests of the Altamaha River, Georgia
… preferred stations with less variability in tree diameter and more shrubs. My study illustrates the significance of the Altamaha River bottomlands for the conservation of a diverse assemblage of breeding birds, including numerous Neotropical migratory species of regional conservation concern. …
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Historical growth rates and changing climatic sensitivity of boreal conifers
… of relatively long-timescale growth forcing in tree-ring chronologies. The operation of different standardisation techniques, used in dendroclimatology to remove internal, non-climate related growth trends in measured series of ring-widths, is explored with an emphasis on the efficiency of the …
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Using a ground-based lidar instrument (Echidna ®) to reconstruct three-dimensional forest structure for biophysical and ecological studies
… forest structural parameters that include tree diameter at breast height (DBH), tree height, crown diameter, crown height, and foliage area volume density (FA VD), that agree with field measurements and by airborne lidar data. I generate a fine-resolution digital terrain model (DTM) and …
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THE ARCHAEOLOGICAL INVESTIGATION OF CEDAR BARK BASKET TREES IN WESTERN MONTANA: BACKGROUND, METHODS, AND TRIAL STUDY OF CULTURALLY MODIFIED TREES
… investigations of culturally modified trees (CMTs) in the northern Rocky Mountain region of Western Montana. Culturally modified trees are considered to be living artifacts, representations of traditional culture, and a lasting physical manifestation of long term use by inhabitants. The …
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THE ARCHAEOLOGICAL INVESTIGATION OF CEDAR BARK BASKET TREES IN WESTERN MONTANA: BACKGROUND, METHODS, AND TRIAL STUDY OF CULTURALLY MODIFIED TREES
… investigations of culturally modified trees (CMTs) in the northern Rocky Mountain region of Western Montana. Culturally modified trees are considered to be living artifacts, representations of traditional culture, and a lasting physical manifestation of long term use by inhabitants. The …
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Tree Growth and Carbon Balance in a Temperate Forest Exposed to Elevated Carbon Dioxide for Eight Years
… scale of forests and long-lived nature of trees. I conducted this research in a Pinus taeda forest exposed to elevated [CO2] using Free Air Carbon dioxide Enrichment technology for 8 years. Growth was stimulated in the dominant canopy species in every year of the experiment with no evidence …
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