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 62 for “"clearcut"”.
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Clearcut Solutions? An Evaluation of Partial Harvesting in the Black Spruce Boreal Forest
… are long, regulated even-aged management by clearcutting has truncated forest age-class distributions. Partial harvesting has been proposed as a means to maintain the structural complexity and biodiversity associated with old forests while allowing continued timber production. Despite the …
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Effects of group selection and clearcut openings on wildlife in Appalachian hardwood forests
… as an alternative silvicultural system to clearcutting in Appalachian hardwood forests, but there is little, if any, information on the effects of group selection on wildlife. Thus, I studied and compared the effects of group selection and clearcut openings on wildlife in the Jefferson …
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Nutrient dynamics of the forest floor in an Appalachian oak forest stand following clearcutting and whole-tree removal
… upland Appalachian oak forest stands following clearcutting and whole-tree removal. Samples from the L, F, H, and A₁ layers were collected during June, August, and November of 1979 and 1980. Monthly litterfall was collected from October, 1979, through October, 1980. Soil solution samples were …
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Influences of varying stand harvest methods on timber harvesting costs in southwestern Virginia hardwoods
… a group selection tract as compared to a clearcut. Eight loggers were contacted and interviewed to obtain data on their costs of logging. The mean, median, and standard deviation of the responses were calculated to develop a profile. Mean crew size was three men, including the owner …
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Identifying physiological and growth-allocation strategies among varying resource availabilities enabling Scotch broom (Cytisus scoparius (L.) Link) dominance in recently clearcut Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) forests of the western Pacific Northwest
Scotch broom is an aggressive, N-fixing invader of recently harvested Douglas-fir forests in the western Pacific Northwest. We expected Scotch broom’s ability to dominate a site and displace planted Douglas-fir to be mediated by available resources and the susceptibility of a recently harvested …
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Effects of alternative silvicultural practices on oak regeneration in the southern Appalachians
… Virginia. Treatments included: silvicultural clearcut, leave-tree, commercial clearcut, shelterwood, and group selection. The effects of harvesting were compared among sites and among treatments. Oak regeneration dominance, measured by the relative density of dominant and codominant oak …
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ESTIMATING WILDLIFE BIODIVERSITY OF PINE PLANTATION EDGES OF CONTRASTING ROTATIONAL STAGES: A CASE STUDY
… pre-thinned - post-thinned, B= pre-thinned - pre-clearcut, and C= post-thinned - pre-clearcut. For two summer seasons (May-August 2015-2016), invertebrates, birds, medium mammals, and small mammals were sampled in each edge type. Richness, extrapolated richness, two indices for diversity, two …
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Vegetation Responses to Seven Silvicultural Treatments in the Southern Appalachians One-Year After Harvesting
… 5) low-leave shelterwood, 6) leave tree, and 7) clearcut. The effects of harvesting were compared between treatments and between pre-harvest and post-harvest samplings. Species richness, percent cover, and local species extinctions were calculated for sample plots ranging in size from 1m2 to 2 …
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Habitat Associations and Demography of Small Mammals in 4 Forest Cover Types on Quantico Marine Corps Base, Virginia
… Marine Corps Base, VA. Study sites included clearcut, shelterwood, mature-riparian, and mature-upland habitats. My primary objective was to determine whether the abundance, species composition and demographic characteristics (density, survival, reproductive effort) of small mammals varied …
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Predicting Regeneration in Appalachian Hardwood Stands Using the REGEN Expert System
… mature stand and an adjacent regenerating stand (clearcut) of similar site productivity harvested within the past 20 years. Across all 48 sites, model predictions were within 5% of measured values on average, and explained 32% (R2 = 0.32) of the variation in species composition in regenerating …
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The impacts of seven silvicultural alternatives on vascular plant community composition, structure, and diversity in the southern Appalachians
… low-leave shelterwood, (6) leave tree, and (7) clearcut. The effects of each treatment on the vascular plant community were characterized by changes in species diversity, species composition, exotic species richness, Raunkiaer's life-forms, and growth-forms. Pre-treatment, baseline data, and a …
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The Economics of management effort in planted forests: an empirical analysis of fertilization and thinning prescriptions of Pinus taeda in the US South
… where exactly they should fertilize, thin and clearcut must be answered. We take advantage of an experiment established in 5 different states in the US South. Forest inventory data was collected for different combinations of thinning densities where some of them received fertilization. We use …
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Ecology of the Tropical Freshwater Turtle Rhinoclemmy's Funerea in Caribbean Costa Rica
… turtle and occupied lotic habitats ranging from clearcut areas with abundant aquatic vegetation to primary rainforest devoid of aquatic vegetation, while juveniles were terrestrial forest dwellers. Food habits were almost totally herbivorous and included both aquatic and terrestrial plants. …
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Overstory density and its effect on oak regeneration abundance and oak understory height growth in the Missouri Ozark Highlands
… when overstory density was increased above the clearcut level. Results suggest that regulating overstory density is necessary to control regeneration abundance and understory height growth. Reducing overstory density below the B-level on the Gingrich diagram (1967) may be necessary to allow …
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Augmented tools with transparent displays
… transparent displays for augmented fabrication (Clearcut).
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Prescribing optimal harvests in forests containing even-aged and uneven-aged stands
… timing of pre-defined thinning treatments and clearcut harvests for even-aged stands. Recent research results provide various means of numerically deriving optimal management prescriptions for single-stand problems, thus considering all feasible solutions as opposed to considering only …
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Potential Effects of Forestry Best Management Practices and Implementation Rates on Soil and Water Resources in the Southeastern United States
… Mountains, Piedmont, and Coastal Plain, across clearcut harvest sites in the southeastern U.S. First, BMP implementation rates, audit questionnaires, and state guidelines were compared across 13 states in the southeastern region at 116 clearcut harvest sites. Overall, BMPs were implemented at an …
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Economic analysis of thinning alternatives in natural stands of yellow-poplar
… in which interest rates, thinning costs, and clearcut stumpage values were varied. The optimum regimes expressed varying degrees of sensitivity to changes in the economic parameters.
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Effects of Alternative Silvicultural Treatments on Regeneration in the Southern Appalachians
… the southern Appalachians have moved away from clearcutting in favor of variable retention harvesting systems. A study was initiated in 1995-8 to investigate the effects of retaining varying numbers of residual trees on regeneration in seven silvicultural treatments. A second study specifically …
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Estimates of above-ground phytomass and nutrients in the understory vegetation in an Appalachian oak forest in Virginia
… four non-contiguous compartments which are to be clearcut and whole-tree harvested in the near future. A partial random sampling scheme was utilized to select 20 x 20m study areas, within which 48 1 x 1 m and 16 5 x 5 m herb and shrub stratum plots were nested respectively. Statistical tests …
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