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 24 for “"deciduous trees"”.
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Spatial, temporal and dendrochronological comparisons of mercury in Ontario deciduous trees
… attention. This study focuses on the role of trees as a source and/or sink of Hg to the environment and the ap- plicability of deciduous trees as biomonitors for Hg. Leaf, bark and wood core samples were taken from a variety of deciduous species including Acer spp. (sugar, silver and red …
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Urban Rainfall Interception of Evergreen and Deciduous Trees for the Southeastern United States
… understanding of differences in evergreen and deciduous trees. Parallel experiments at six sites were compared for evergreen and deciduous trees during 235 total rains for the first hypothesis. Paired T-tests revealed that mean throughfall for evergreens was significantly less (greater …
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Multi-scale Remote Assessment of Phenology of Photosynthesis and Productivity of Northern Forests
Northern trees undergo seasonal regulation of photosynthetic activity in response to environmental conditions. Remote sensing provides a powerful tool to assess photosynthetic phenology at the global scale. However, traditional “greenness” based vegetation indices, like the normalized difference …
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The Residential Urban Forest: Linking structure, function and management
… associated with decisions to plant or remove trees and how these management actions have altered and will continue to transform the forest structure over time, and (3) estimate the current and future carbon storage benefits based on reported management actions and considerations. I use two …
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Vegetation community development eight years after harvesting in small streams buffers at the Malcolm Knapp Research Forest
… than in the 30m buffer and control. Shrubs and deciduous trees dominate the 0m and 10m buffer treatments. Proximity to the stream does not affect the composition and abundance of species with the exception of herbs and mosses. In the 10m and 30m buffer treatments, up to 15% overstory trees were …
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Estimating Plot-Level Forest Biophysical Parameters Using Small-Footprint Airborne Lidar Measurements
… biophysical parameters measuring individual trees identifiable on the three-dimensional lidar surface. This study derived the digital terrain model from lidar data using an iterative slope-based algorithm and developed processing methods for directly measuring tree height, crown diameter, and …
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Measuring the Momentum of Throughfall Drops and Raindrops
… produced by commercially planted loblolly pine trees and indigenous deciduous trees. The substitution of the loblolly pine for the deciduous trees represents a human induced change of the vegetation which could have an impact on the drainage basin's erosional characteristics. The purpose of the …
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Mammal Damage and Movements of Deer Mice in South Dakota Shelterbelts
… tree species encountered in this study. Of the trees examined, 398 (8. 9%) sustained animal damage over the winter. Dogwood (Cornus stolonifera Michx.), received significantly more damage than the other species. Conifer trees received significantly less damage than deciduous trees. Branch damage …
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A comparative Study of the Population Densities of Various Tardigrada Species
… samples were collected from 12 species of deciduous trees from 12 locations in Polk County, Iowa. The regions varied in particulate count, measured in tons of dust fall per month, and traffic flow density, measured in number of cars per year. Tardigrades were collected from samples, mounted …
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Nest-site selection by Sharp-shinned Hawks in Kentucky
… Nests were at a mean height of 18.6 ± 1.4 m in trees with a mean height of 23.7 m and mean dbh of 38.2 cm. Nests were in mixed coniferous/deciduous forests, with a mean canopy cover of 77.6%. Comparison of the characteristics of nest sites and randomly selected unused sites revealed significant …
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Signatures of natural selection and local adaptation in Populus trichocarpa and Populus deltoides along latitudinal clines
Trees, like many other organisms, decrease their rate of metabolic activities to cope up with harsh environments. This stage of "dormancy" is marked by shedding of leaves and bud-set in deciduous trees. Recent studies have revealed the role of the circadian clock in synchronizing the timing of …
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What to plant and where to plant it; Modeling the biophysical effects of North America temperate forests on climate using the Community Earth System Model
… afforestation with either needle leaf evergreen trees (NET) or broadleaf deciduous trees (BDT) and between forests with high and low leaf-area indices (LAI). Afforestation from crops to forests resulted in lower albedo and higher sensible heat flux but no consistent difference in latent heat …
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Leaf nutrient draw back as a strategy for tree grass co-existence in the savanna biome
As there is still a major debate on how trees and grasses manage to coexist in the savanna biome, the niche separation by phenology hypothesis (Scholes and Archer 1997) was tested by observing the seasonal variation in carbon and nitrogen concentrations in leaves and young twigs of two deciduous …
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The Asian Tiger Mosquito (Aedes albopictus): Spatial, Ecological, and Human Implications in Southeast Virginia
… hold water, and yards that contain coniferous trees versus deciduous trees. The primary socio-economic variables that can signify an environment with high A. albopictus activity are: lower house value and median rent value, lower levels of education, and a lower median income level. Other …
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The impact of past land-use change on floristic diversity in southern Sweden : a quantitative approach based on high-resolution pollen data
… coniferous woods and fewer habitats related to deciduous trees and open land taxa, which may not be sustainable to preserve floristic diversity in the future. This thesis provides some examples of long-term (decadal to millennial scale) impacts of land-use changes on floristic diversity at …
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Premigratory movements of a long-distance migratory species: the Wood Thrush (Hylocichla mustelina)
… [52%], (2) gypsy moth (Lymantria dispar) damaged deciduous forest [21.8%], (3)Virginia pine (Pinus virginianus) forest that had a heavy understory of young deciduous trees and an open canopy [15.6%], and (4) mature mixed forest [10.6%]. Most fledglings(73%) left the Marine Base in September at the …
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Aspects of American Bittern Ecology in Northwest Minnesota
… to abundance (P < 0.005). Cattail, deciduous trees, and willow/grassland were avoided while open water was preferred (P < 0.10). Small sample size (n = 5) likely produced spurious habitat use results.</p> <p>No refinements were made to marking techniques. I; is recommended that the …
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Novel studies of the dynamics of mineral N species transformations and their mobilities relevant to assessing risks to drainage water.
… brief preliminary investigation of the idea that deciduous trees have evolved naturally to provide a close match between the dynamics of N release by litter decomposition and the dynamics of plant N requirement. The experiment showed that initially the fresh litter with a high C/N ratio …
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Microlepidoptera of Illinois hill prairies
… component of species that feed as larvae on deciduous trees that surround the prairie. This agrees with the finding of high beta diversity of moths between the sites, which reflects a high level of larval hostplant specificity in most species of Pyraloidea and Tortricidae. Based on published …
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