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 28 for “"even-aged"”.
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Prescribing optimal harvests in forests containing even-aged and uneven-aged stands
… basal area or residual stand structure for uneven-aged stands, and 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 …
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Economic Comparisons Between an Even-Aged and an Uneven-Aged Loblolly Pine Silvicultural System
This study compares financially optimal uneven-aged and even-aged silvicultural regimes of loblolly pine (Pinus Taeda). Uneven-aged regimes which maximize net present value (NPV) are found by quantifying the effects of diameter distribution (Q factor), maximum diameter, cutting cycle, and residual …
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Even-aged regeneration alternatives for low quality oak hardwood forests in the Virginia Piedmont
… dormant and growing season harvests, and four even-aged regeneration treatments on natural hardwood and planted loblolly pine (Pinus taeda L.) are examined three years after clear felling and whole-tree harvesting upland hardwood stands in the Virginia Piedmont. Natural hardwood regeneration …
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Evaluating the Potential for Estimating Age of Even-aged Loblolly Pine Stands Using Active and Passive Remote Sensing Data
… Landsat were evaluated for estimating ages of even-aged loblolly pine stands in Appomattox-Buckingham State Forest, Virginia, U.S.A. The DBInSAR data were acquired using the GeoSAR sensor in summer, 2008 in both the P- and X-bands. The LiDAR data were acquired in the same summer using a …
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Site quality factors affecting Acer saccharum, Quercus rubra and Quercus alba abundance and height growth rates in young even-aged stands located in central Missouri
… maple, white oak, and northern red oak in young even-aged, 5-29-year old, forests of central and east central Missouri in the lower Missouri and lower Osage River valleys. Relationships were examined in plots samples in 44 stands through examination of the soil profile, individual tree …
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Effect of season of harvest and site quality on hardwood regeneration on the Virginia Piedmont
… red maple and sourwood. In stands under even-aged silviculture, season of harvest can be used as an effective management tool to favor different species compositions. If oak or other hardwood production is the management objective a dormant season harvest will result in increased sprout …
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Fire, climate, and forest structure in ponderosa pine forests of the Black Hills
… resulted in large landscapes of dense, even-aged forest. I examined this alternative model for the Black Hills using fire-sear and tree-age data. Fire chronologies from over 1000 trees collected at over 50 locations span the past four to six centuries. Compared to other ponderosa pine …
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Overstory density and its effect on oak regeneration abundance and oak understory height growth in the Missouri Ozark Highlands
… treatment types, no harvest management, uneven-aged management, and even-aged management. The probability of obtaining regeneration that met height and abundance thresholds decreased with increasing overstory density for white oaks, red oaks, and non-oaks. A relatively small increase in …
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Effects of riparian buffer width on stream salamander populations in the southern Appalachian Mountains
… North Carolina to determine the impacts of even-aged timber harvest on salamander populations and to assess the efficacy of riparian buffers in ameliorating these effects. My data show that larval two-lined salamanders are negatively impacted by increased stream sedimentation following …
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Acacia karoo and its effects on the succession of dune forests in the Eastern Shores, Kwazulu-Natal
… The present paradigm holds that the A. karoo is even aged and will senesce after 25 years, while recruitment does not occur in the patches. I find no evidence of canopy senescence and microhabitats within which recruitment of A. karoo occurred were identified. Further the introduction of other …
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Analysis of timber harvest scheduling under alternative levels of land aggregation: an application to a hypothetical Mexican forest ownership
… finely distinguished planning unit areas of an even-aged ponderosa pine forest in Northwestern Mexico. Factor analysis was applied to eighteen timber inventory variables to produce four independent and meaningful constructs that explained 87% of the total variable set’s variation. Next, each …
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Essays in applied microeconomics: Public policies and their impacts on health
… model. The policy expanded to every even-aged woman in their 30s, which was originally provided only to even-aged women who are primary subscribers of employer-based national health insurance. The findings indicate an increase in cervical cancer screening by 4.4 percentage points …
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Effects of Infanticide Risk and Timber Harvest on American Black Bear Space Use
… some gender and seasonal differences. Bears used even-aged stands more than uneven-aged stands and stands > 6 years old more than younger stands. However, bear use did not differ between deciduous stands and coniferous stands, or among land cover types except that grass/pasture and open water were …
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Nest-site selection by Sharp-shinned Hawks in Kentucky
… nests were in stands of young (~25-50 years), even-aged conifers about 18 to 25 m in height, with the dense cover provided by the conifers likely providing protection from predators. Nest sites were also close to edges where stands of dense pines transitioned into areas with more, shorter …
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Effects of Low-Input Vegetation Management on Pine-Hardwood Mixed Stands in the Northern Piedmont
… competing vegetation during the study. The four even-aged regeneration treatments applied to loblolly pine and mixed hardwood stands of this study had a significant effect on their growth. Loblolly pine growth increased and mixed hardwood growth decreased as the intensity of herbicide treatment …
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The impact of group selection silviculture on timber harvesting cost in the southern Appalachians
… Appalachians is changing from traditional even-aged management and clearcutting to uneven-aged management and group selection silviculture. Group selection, with its small 1/2-to-2-acre patch cuts widely dispersed throughout a timber stand, has the potential to substantially increase timber …
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Applications of ecological modeling in managing Central Appalachian upland oak stands for old-growth characteristics
… stand area by utilizing neighboring younger, managed stands allows private landowners to meet management needs and enables government agencies and private conservation organizations to meet old-growth forest objectives. Seven old-growth upland oak stands and seven adjacent younger, managed stands …
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Clearcut Solutions? An Evaluation of Partial Harvesting in the Black Spruce Boreal Forest
… forest where fire cycles 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 …
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