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 65 for “"Vegetation Composition"”.
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Initial Wetland Hydrology and Vegetation Composition in Predicted Wetlands Adjacent to Lake Naconiche, Nacogdoches County, Texas
… around the lake and establish a benchmark of vegetation composition and condition for future comparison. Eight locations, placed where the majority of wetlands were expected to form, were chosen for monitoring from the shoreline at 348 feet above mean sea level (ft MSL) to the county fee take …
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Influence of Woody Vegetation Composition and Structure on Fuels and Prescribed Fire in Mountain Longleaf Restoration
… 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 Georgia. I hypothesized that woody vegetation composition and structure indirectly influence fire …
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Vegetation Community Changes in Two National Forests in the Pineywoods, East Texas
… unclear and further research into terrestrial vegetation and an accounting of drivers in specific ecosystem types is required. This study addresses change in plant communities from five ecosystem types in two east Texas National Forests over a 20-year period. An analysis of 30 sample stands …
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The macro-charcoal signature in Bwabwata National park, north-east, Namibia: Calibrating surface macro-charcoal with environmental variables
Fire is a major driver of vegetation patterns in the savanna biome of southern Africa and is hypothesized to allow for the tree-grass co-existence. However, to better understand the drivers of the savanna vegetation structure, more research is required. Furthermore, fire management can benefit …
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Hydrologic Regime and Soil Property Interactions in a Forested Peatland
… fire vulnerability, soil oxidation, and altered vegetation composition. Peatland function is largely dependent on hydrologic regimes and their influences on the accumulation and properties of peat soil. Therefore, an understanding of soil-hydrology interactions is needed to inform management in …
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Characterization Of Arctic Soils: Interrelationships With Site And Vegetation
… the inherent regularity of site conditions and vegetation composition.;Differences between horizons were found to be characterized by organics (notably the sum of soluble and insoluble fractions determined using Kononova's (1966) technique), with pH, "free" iron (Fed), bulk density, and certain …
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Lowland savanna of southeastern Iowa: historical and modern vegetation patterns and implications for management
… which lack quantitative data on their structure, composition, and restoration. The purpose of this thesis was to assess both historical and modern vegetation composition and structure of lowland savannas and to determine the success of recent management of a lowland savanna remnant. Lowland …
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Characterization of urban wetland vegetation and management practices
… flooding risks and improve water quality. Vegetation is a key component of urban wetlands; plants promote sedimentation, play critical roles in biogeochemical cycling, and provide food and habitats for other organisms. My research focuses on the standing vegetation and seed banks of urban …
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Investigating population status, habitat, and ecological interactions for the Sand Mountain blue butterfly, one of North America's most geographically restricted butterflies
… and adult life stages? 3) to what extent has the vegetation composition changed over the years at Sand Mountain? and 4) which insects at Sand Mountain are using and potentially pollinating E. nummulare? To address the population question, adult butterfly counts were conducted in the years 2006, …
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Stormy records from peat bogs in south-west Sweden : implications for regional climatic variability and vegetation changes during the past 6500 years
… explain variations in storm activity, humidity, vegetation composition and land cover in south-west Sweden during the past 6500 years. Two ombrotrophic bogs, Store Mosse and Undarsmosse, situated on the coastal plain of Halland, were selected for this purpose. The coastal plain of Halland is …
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SPATIO-TEMPORAL DYNAMICS OF BIOMES IN THE NORTHWESTERN UNITED STATES (9000 YBP TO THE PRESENT)
… study was to quantitatively analyze and map the vegetation composition of forest, grassland, and steppe ecosystems in the northwestern United States in the present and through the last 9,000 years. The modern analysis used canonical correspondence analysis (CCA) on pollen percentages from recent …
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SPATIO-TEMPORAL DYNAMICS OF BIOMES IN THE NORTHWESTERN UNITED STATES (9000 YBP TO THE PRESENT)
… study was to quantitatively analyze and map the vegetation composition of forest, grassland, and steppe ecosystems in the northwestern United States in the present and through the last 9,000 years. The modern analysis used canonical correspondence analysis (CCA) on pollen percentages from recent …
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Long-term vegetation change in the Succulent Karoo, South Africa following 67 years of rest from grazing
Changes in species richness and vegetation composition in the diverse semi arid Succulent Karoo vegetation of South Africa were investigated after 67 • (1937-2004) years of rest from grazing at the Worcester Veld Reserve. Vegetation change in 70 plots at this 75 ha site was assessed using multi …
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Long-term vegetation change in the Succulent Karoo, South Africa following 67 years of rest from grazing
Changes in species richness and vegetation composition in the diverse semi arid Succulent Karoo vegetation of South Africa were investigated after 67 • (1937-2004) years of rest from grazing at the Worcester Veld Reserve. Vegetation change in 70 plots at this 75 ha site was assessed using multi …
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Feeding facilitation, the hidden interaction in mammalian herbivore assemblages?: a case-study on rabbits (Oryctolagus cuniculus L.) and large grazers
… (medium-sized herbivores) by modification of the vegetation. This modification involves creating short swards, creating denser (more productive) swards, creating swards that have a high food quality for rabbits and influencing vegetation composition. By conducting field observation, …
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Past precipitation, watershed characteristics, and drought: interactive effects on watersheds of Northern California.
… such as aspect, elevation, soil type, vegetation composition, and stand age, are known to impact runoff through differences in evapotranspiration and storage. Drought may further change the hydrological function, or precipitation-runoff relationship of a watershed. In this study, I …
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The dynamics of the Afromontane forest remnants in the Southwestern Cape
… the floristic and structural changes in vegetation composition across the indigenous forest ecotone. The dynamics of forest-fynbos boundaries of differing post-fire age are compared and patterns of vegetation change from forest to fynbos are related to environmental constraints and …
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Assessing The Impacts Of Grazing By Piney Woods Cattle And Controlled Burning On The Herbaceous Layer In An East Gulf Coastal Plain Longleaf Pine Woodland
… and grazing are two disturbances which influence vegetation composition and diversity in many ecosystems. In the southeastern United States, longleaf pine plant communities are adapted to frequent fires and are likely to have been grazed by bison in the past. Though bison have been extirpated from …
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NEW INSIGHTS INTO THE PALEOVEGETATION OF THE ANCIENT UNDERWATER FOREST LOCATED IN THE NORTHERN GULF OF MEXICO
… climate conditions and sea levels changed, the vegetation of this glacial refuge shifted from bald cypress forests to open marshes, altering the vegetation dynamics. The present research analyzed four new cores (21DF-5A, 21DF-5B, 15DF-6, and 16DF-3A), which provided additional insights into the …
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Analysis of Fossil Pollen from a Pleistocene Cypress Forest Preserved on the Northern Gulf of Mexico Continental Shelf
… Forest or DF). This research aims to establish vegetation composition on a continental shelf glacial refuge and provide a better understanding of vegetation response to sea-level rise. Two cores (15DF1 and 15DF3B) located at different locations within the forest were recovered and analyzed. …
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