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 51 for “"Vegetation Changes"”.
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Monitoring Regional Vegetation Changes in Seward Peninsula, Alaska, Using Remote Sensing Technique
Arctic vegetation has been undergoing various transitions depending on its regional characteristics and numerous contributors to these changes include direct human impact and natural changes in the earth’s climate system. The commonest causes of the vegetation change over a large arctic area are …
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Mapping and Modelling of Vegetation Changes in the Southern Gadarif Region, Sudan, Using Remote Sensing
… and its rapid expansion on the natural vegetation in the southern Gadarif Region. To achieve these objectives the study utilized a series of techniques. Beside the intensive use of remote sensing imagery, interviews with key informants and farmers as well as detailed field surveys were …
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The Effect of Seasonal Vegetation Changes on Habitat Suitability and Predation Risk of the Vancouver Island Marmot
… sinks for the species. Tree encroachment and vegetation shifts in these habitats are likely affecting seasonal vegetation cover and reducing the ability of marmots to visually detect predators, thereby increasing their risk of predation. Most marmot mortalities occur during the late summer, …
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Late glacial to Holocene climate and vegetation changes on the Tibetan Plateau inferred from fossil pollen records in lacustrine sediments
… summer monsoon intensities. New climate and vegetation sequences were then established using improved quantitative methods, focusing on fossil pollen records recovered from Tibetan lakes and also incorporating new modern datasets. The pollen-vegetation and vegetation-climate relationships on …
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Fossil C 4 plant signals in Southeast Atlantic Ocean continental margin sediments indicate climate-dependent vegetation changes on the adjacent continent
… be suitable proxies to trace climate dependent changes in the predominance of C4 or C3 land plants. Leaf waxes of 35 C4 grasses and three C3 grasses were analysed. These investigations revealed that C4 grass waxes have significantly higher compound-specific delta13C values, high contents of …
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Using a multiproxy analysis of springbok fossils to track 2 million years of vegetation changes experienced by hominins in southern Africa.
A causal link between climatic changes and hominin evolution is an established one, yet the exact dynamics of this relationship is debated. Key climatic changes, such as the intensification of the Northern Hemisphere Glaciation, the onset of the Walker Circulation and the Mid-Pleistocene …
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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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Living in a changing world: an integrated approach to documenting and understanding medium to long-term vegetation changes in three contrasting land use systems in a mesic savanna, Nothern Zululand, South Africa
… three contrasting land use systems on long-term vegetation dynamics in a mesic savanna. I aimed to determine if land m;e practices alone could account for the changes in vegetation cover evident at the study sites between 1937 and 2004. An alternative explanation for the changes could be linked …
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Modeling the potential impacts of vegetation change on the future climate of Southern Africa
… without including the influence of on - going vegetation changes in the region. This study investigates how the vegetation changes may alter the projected warming. For the study, two regional climate models (RegCM and WRF) were applied to simulate the present day (1970 - 2005) and the future …
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Studies in the holocene vegetation history of Wensleydale
… as the basis for a discussion of the Holocene vegetation history of Wensleydale. The palynological, radiocarbon, humification, chemical and archaeological/historical evidence is drawn together to provide a comprehensive study of the vegetation changes which have occurred over the approximately …
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A Dendrochronological Analysis of Vegetation Change and Climate History in Two Southern Appalachian Balds, Craggy Gardens and Big Bald, NC
… disturbances have had a profound impact on vegetation dynamics in these systems. With the use of dendrochronology and GIS, this research project was aimed at 1) reconstructing the temporal and spatial patterns of tree encroachment into Craggy Gardens, a grass/heath bald, and determining the …
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Atmosphere-vegetation interactions over South Africa
… sensitivity of the atmospheric circulation to vegetation change over South Africa in the context of the portended global warming. This is achieved using a vegetation model driven by climate change information and subsequently incorporated within a general circulation model (GCM). The …
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The Analysis of Palaeobotanical Remains from Native American Sites in the Tennessee Region of the Upper Cumberland Plateau.
… analyzed for the presence of pollen to determine vegetation changes that may accompany the use of controlled burns and to determine the onset of horticulture. The Upper Cumberland Plateau is often considered a marginal area used only seasonally by Native Americans; however, management practices …
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Dynamics of two South African floodplain forests
… processes may lead to subtle or significant vegetation changes that will affect the understanding, management and conservation of these systems. This is particularly true in semi-arid environments where a functioning river is a vital source of water and nutrients for the maintenance of …
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The Use of Biomarker and Stable Isotope Analyses in Palaeopedology / Reconstruction of Middle and Late Quaternary Environmental and Climate History, with examples from Mt. Kilimanjaro, NE Siberia and NE Argentina
… from these archives about sedimentation, vegetation and climate history, various methods and proxies are traditionally applied, e.g. texture analysis, numeric dating methods and mineral analysis. The aim of this dissertation is to evaluate the potential of biomarker and stable isotope …
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DEFINING POSTMORTEM CHANGES IN WESTERN MONTANA: A LONGITUDINAL STUDY OF THE RATE AND SEQUENCE OF SURFACE AND BURIAL DECOMPOSITION
… internal temperature, relative humidity, vegetation changes, pH levels, animal patterns, and insects. The results from this study indicate that regardless of whether a body is deposited on the surface or buried, mummification of external tissues occurs and is persistent for at least …
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DEFINING POSTMORTEM CHANGES IN WESTERN MONTANA: A LONGITUDINAL STUDY OF THE RATE AND SEQUENCE OF SURFACE AND BURIAL DECOMPOSITION
… internal temperature, relative humidity, vegetation changes, pH levels, animal patterns, and insects. The results from this study indicate that regardless of whether a body is deposited on the surface or buried, mummification of external tissues occurs and is persistent for at least …
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Ground water-surface water interaction of Rio Grande Biopark area, Albuquerque, New Mexico
… ground water levels and observations of vegetation densities adjacent to the Biopark wetlands. Numerical models were developed of the influence of the river stage on ground water levels near the wetlands and of the interaction between the wetlands and the ground water. Model results were …
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Remote Sensing Methods for Environmental Monitoring of Human Impact on sub-Arctic Ecosystems in Europe
… In this context, the dynamics of boreal vegetation, and of the forest/tundra interface (the treeline), is the most representative indicator of environmental changes in the sub-Arctic. For some time now, monitoring land cover and vegetation changes using remote sensing techniques have been …
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Plant Community Development of Isle Royale's Moose-Spruce Savannas
… and another 20% were starting to break-up. The changes in understory vegetation brought about by savanna formation have received little attention, even though the future of moose and wolf populations on Isle Royale are tied to these vegetation changes. This study examined the vegetation of …
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