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 42 for “"canopy closure"”.
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Prescribed Fire Effects on Woodland Structure, Light Levels and Understory Plant Communities in Missouri Oak-Hickory Woodlands
… unburned woodlands. This study also examined if canopy closure provides a representative measure of the light available to understory plant populations because canopy closure measured with a concave spherical densiometer is often used as a surrogate for light measures. There was a significant …
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Canopy Characteristics Affecting Avian Reproductive Success: The Golden-cheeked Warbler
… success and habitat characteristics, including canopy closure and tree species composition, at the study site and territory scale. My study took place within Kickapoo Cavern State Park and surrounding private properties in Kinney and Edwards counties in the southwest corner of the golden-cheeked …
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Forest Composition, Regeneration, and Tree Quality in the Southern Appalachian Mountains of Virginia: Selective Cutting vs. Shelterwood
… and size; (4) sapling crown class; and (5) canopy closure. Seedlings, saplings, and overstory trees were sampled at 22 SC and 28 SW sites. Significant differences identified between the two harvest types included: biodiversity of overstory and seedling layers; species densities for …
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Vegetational change resulting from forest conversion in the central Piedmont of Virginia and their implications for wildlife
… by a decline from 5 to 15 years, at Which point canopy closure was complete and these variables were relatively stable for the next seven years. Evenness over time was fairly constant, except for three-rear-old stands where a decline occurred due to predominance by <u>Andropogon virginicus</u>. …
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Assessment Of Natural Roost Availability And Artificial Roost Preference By Indiana Bats In Scott County, Kentucky
… of reproductive condition on roost type and canopy closure selection. I also characterized the forest overstory composition and determined the quantity and quality of Indiana bat roosting habitat across the landscape. My field site was Veterans Memorial Wildlife Management Area (VMWMA) in …
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Impacts of Elevated Carbon Dioxide and Tropospheric Ozone on the Growth and Productivity of Trees
… under open-air conditions from planting through canopy closure. Extensive measurements taken at PopFACE detailing photosynthesis, canopy leaf area development and microclimate created an unparalleled opportunity to provide the first estimates the gross primary productivity (GPP) of trees grown …
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Discerning Differences in the Plant Traits of the Floral Communities of Mt. Washington, NH, by Incorporating Intraspecific Variability Analysis
… sites’ trait differences associated with canopy closure (light availability). Comparing plant traits along this elevational gradient, from alpine to sub-alpine using measures of intraspecific variability, allows us to investigate any underlying effects. These include differences in air …
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Between-row mower design for weed control in organically grown no-till soybeans
… were 4 in (10.2 cm) and repeated as needed until canopy closure. Broadleaf and grass biomass was collected between-row and in the row of organic soybeans to evaluate the efficacy of the weed treatment. Weed biomass was not significantly different at either testing locations. Yield from mowing with …
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The photoprotective role of thermonastic leaf movements in Rhododendron maximum: potential implications to early spring carbon gain
Rhododendron maximum L. is a dominant subcanopy species in the southern Appalachian Mountains. R. maximum undergo distinct thermonastic leaf movements (TLM). The purpose of these movements has not yet been determined. Previous studies have suggested TLM are a photoprotective mechanism for the …
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Modeling winter habitat for white-tailed deer in southwestern Virginia
… mean distance to a gated gravel road, and mean canopy closure. Spearman's rank correlations were used to compare the model outputs with estimated pellet group densities. All of the models had correlation coefficients ≥ 0.60, four had correlation coefficients > 0.80. The models need to be …
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Limnological And Landscape Factors Affecting Use Of Manufactured Ponds By The Invasive Cuban Treefrog (Osteopilus Septentrionalis)
… and area) and seven landscape characteristics (% canopy closure over ponds, building density, distance to nearest building, road density, distance to nearest road, distance to nearest forest stand, and % forest cover), plus five biotic factors (native amphibian richness and abundance, fish …
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Diversity, Invasibility, and Stability of Appalachian Forests across an Experimental Disturbance Gradient
… to be more easily invaded following intense canopy disturbance. Interestingly, none of the sites in this study were dominated by invasive plants, which led me to ask whether dominant tree species in forests provided resistance to nonnative plant establishment and growth through the quality of …
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Efficacy Of Constructed Wetlands Of Various Depths For Natural Amphibian Community Conservation
… and emergent vegetation were greater, whereas canopy closure was lower compared to natural wetlands. These data have influenced DBNF land managers to revise wetland construction methods and renovate older deep constructed wetlands to attempt to replicate the hydrology of natural ridge-top …
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Breeding bird populations in relation to the vegetation structure of abandoned contour mines in Southwest Virginia
… decreases in bird populations were observed when canopy closure apparently affected a reduction in understory vegetation. Bird populations of the marginal areas decreased with the reforestation of the disturbed areas, apparently reflecting a decrease in the edge effect. Several sets of equations …
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The Ecology of the Endangered Dusky Gopher Frog (Rana Sevosa) and a Common Congener, the Southern Leopard Frog (Rana Sphenocephala)
… I found that habitat change in the form of canopy closure over breeding ponds negatively affects both species, making them smaller as tadpoles and at metamorphosis. The magnitude of size differences was greater for R. sevosa and this species was less likely to survive in closed canopy ponds. …
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Browse Availability, Bite Size, and Effects of Stand Age on Species Composition and Browse Density for Moose in Northeastern Minnesota
… browse species. These relationships varied by canopy closure and were used to estimate biomass consumed on foraging paths. We also measured browse availability and use along foraging paths of GPS radio-collared moose and within randomly selected regenerating stands in northeastern Minnesota. We …
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Recreating a functioning forest soil in reclaimed oil sands in northern Alberta
… but declined as reclaimed sites approached canopy closure. Grass and forb leaf litters decomposed faster than aspen or pine in the first year, but decomposition on one reclamation treatment fell below the natural range of variability. Development of an organic layer appeared to be …
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High Throughput Phenotypic Evaluation of Drought-related Traits in Soybean
… of increasing severity (deficit 1, and 2). After canopy closure, aerial infrared images were taken to determine the relative canopy temperature. Soybean leaves sampled at late R5 and seed at harvest were collected to measure Δ13C (leaf and seed) and δ18O (seed) as surrogate measurements for water …
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Genetic Analysis of the Resistance of Soybean Genotypes to Sclerotinia Sclerotiorum
… associated with short plant height and reduced canopy closure at flowering, which may be escape mechanisms, lines from this population may be a good source of sclerotinia stem rot resistance for breeders to use in cultivar development programs. There was significant genetic variation in the PI …
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