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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 30 for “"hardwood stands"”.
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Interference interactions in experimental pine-hardwood stands
… often limits the productivity of pine and pine-hardwood forest stands in the southern United States. However, forest researchers have yet to fully quantify the effect of this interference on forest tree yield and there is an incomplete understanding of the biological mechanisms of interference. …
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Predicting Regeneration in Appalachian Hardwood Stands Using the REGEN Expert System
… variation in species composition in regenerating stands. The species compositions of 41 of the paired stands on the Appalachian Plateau in West Virginia were further analyzed to compare species composition. Species composition was compared between the mature and regenerating stands in the subxeric …
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Effects of European Gypsy Moth Defoliation in Mixed Pine-Hardwood Stands in the Atlantic Coastal Plain
… and possible tree mortality in mixed pine-hardwood stands. This dissertation describes a field study that was initiated to determine the susceptibility and vulnerability of pure and mixed stands of loblolly pine, oaks and sweetgum in pine-oak and pine-sweetgum cover types in the Atlantic …
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The biology of Sassafras albidum (Nutt.) nees in regenerating upland hardwood stands in southwest Virginia following clear felling
… biology of Sassafras albidum growing on upland hardwood sites in the Ridge and Valley Physiographic Province of Virginia ln an attempt to better understand how this common understory species becomes a dominant vegetative component following clear-felling. Biomass and leaf area regressions were …
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Using economic factors in managing Appalachian hardwoods for high quality
… the extremely wide range in product values from hardwood stands, harvest decisions must consider a multiplicity of factors, many of them economic. Among these are species, tree size, tree quality, logging costs, and market alternatives. This study demonstrates how to incorporate these, using a …
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Effect of season of harvest and site quality on hardwood regeneration on the Virginia Piedmont
Many existing Piedmont hardwood stands are composed of trees that are largely under 45 cm in diameter and contain a desirable oak component, as well as large amounts of undesirable red maple and sourwood. In stands under even-aged silviculture, season of harvest can be used as an effective …
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Effects of Low-Input Vegetation Management on Pine-Hardwood Mixed Stands in the Northern Piedmont
… low-input alternatives for regenerating pine-hardwood mixtures, this study examined several mechanisms that influence the growth of pine-hardwood stands. The Regeneration Alternatives Study is an ongoing experiment that was designed to gain biological and economical information concerning the …
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Harvested log damage and value loss associated with two ground-based harvesting systems in central Appalachia
… when conducting partial harvests in hardwood stands, as excessive damage to residual trees will significantly reduce the potential value of the residual stand. Damage to harvested logs, especially hardwood saw and veneer logs can be an even more important concern relative to value …
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FACTORS INFLUENCING THE SPATIAL AND TEMPORAL STRUCTURE OF A CARNIVORE GUILD IN THE CENTRAL HARDWOOD REGION
… (overall point = 0.58 ± 0.03) was higher in hardwood forest stands with open understories than in other habitats. Similar to coyotes, gray foxes were more likely to be photographed in cold weather and after a previous detection had occurred. However, gray fox occupancy was much lower (point = …
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Even-aged regeneration alternatives for low quality oak hardwood forests in the Virginia Piedmont
… 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 was dominated by stump sprouts, with seedlings …
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The long-run timber output potential in eastern Virginia
… in the long run, apparently conversion of hardwood stands to pine, not more intensive management of existing stands, will be the means.
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Overwinter survival of wild turkeys on central Virginia's industrial forests
… the influence from trapping had subsided. While hardwoods composed 38% of the primary treatment area, 65% of turkeys died in hardwood stands; predation accounted for 81% of the turkey mortality (N =42). Field evidence and necropsy results plus scent station data indicated that gray foxes (Urocyon …
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Potential Silvicultural Effects on Bald Eagle Nesting Substrate and Economic Yields at a Navy Installation in the Chesapeake Bay: An Approach Using the Forest Vegetation Simulator and Mahalanobis Distance
… as well as favorable economic yields in hardwood stands. Results also stress the importance of thinning in providing future nesting substrate and maintaining preferred substrate late in the rotation. Economic and habitat tradeoffs varied by treatment, suggesting that optimum prescriptions …
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Harvesting impacts on steep slopes in Virginia
… was to assess ground disturbance from harvesting hardwood stands with conventional rubber-tired skidders on slopes greater than 30 percent in Virginia. Special emphasis was placed on erosion, compaction and soil movement. Ten randomly selected study areas were clear-cut between September 1988 and …
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Influence of Woody Vegetation Composition and Structure on Fuels and Prescribed Fire in Mountain Longleaf Restoration
… purpose, is poorly characterized in mixed pine-hardwood stands with mesophyte encroachment. This study aimed to identify mechanisms by which tree composition, structure, and fuels contribute to fire behavior, focusing on the understudied mountain longleaf pine (MLLP) ecoregion in northwest …
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Evaluating the feasibility of improvement thinnings for fuelwood for private non-industrial landowners in Virginia
… thinnings for fuelwood in Appalachian hardwood stands. 2. determine direct net energy values from energy inputs and outputs for fuelwood harvesting in Appalachian hardwoods. The landowners decision on whether or not to thin was greatly influenced by haul distance and his opportunity …
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The impact of group selection silviculture on timber harvesting cost in the southern Appalachians
… on timber harvest productivity and cost in hardwood stands of the southern Appalachians. This was accomplished by collecting and analyzing field production and cost data from typical Appalachian loggers operating on group-selection timber sales. Three logging systems were chosen for the …
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Wildland fuel loading estimates along a gradient of forest cover types and landscape factors in Harpers Ferry National Historic Park, West Virginia and Rock Creek Park, Virginia, USA
… exhibited the most influence, with mesic mixed-hardwood stands having the least fuel mass and higher fuel mass in xeric oak/hickory stands, pine stands, and floodplain stands, respectively. The National Park Service may be aided in their management of these parks through this knowledge, and …
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