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 86 for “"Vegetation Change"”.
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Land use and vegetation change on the Long Mynd
… of these communities to respond to directional change is well known, indeed the traditional mode of heathland management, burning, depends on the regenerative capacity of the target species, generally heather (Calluna vulgaris), for its success. However, changes in post WW2 stocking practice; …
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Factors affecting recent vegetation change in north-east Libya
… warming and human intervention have led to changes and deterioration in natural vegetation across the world. The Al Jabal Al Akhdar, in north east Libya, is one of those areas that have experienced changes in land cover. This region has environmental and economic importance in providing …
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Studies of herbivory and vegetation change in Karoo shrublands
… how grazing by domestic livestock brings about vegetation change, why such changes are sometimes irreversible, and whether existing conceptual models of vegetation dynamics adequately explain the impact of domestic livestock on Karoo vegetation. Three interrelated aspects of plant-animal …
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Time Series Analysis of Vegetation Change using Hyperspectral and Multispectral Data
… 2007 and QuickBird from 2006 and 2009) to create vegetation classification maps using both library spectra and regions of interest. Two sets of classification maps were produced using Mixture-Tuned Matched Filtering. The results were assessed visually and mathematically. Through visual inspection …
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Vegetation change in response to climate extremes in Limpopo Province, South Africa
… floods, and droughts. In addition, a small change in the variance and mean of climate parameters might result in a strong shift in the intensity and frequency of extreme climatic events. The climatic conditions over southern Africa are highly variable and, and as such, southern Africa region …
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Investigating ecological drivers and impacts of vegetation change in sub Antarctic tundra
Understanding the impact of environmental change on vegetation dynamics requires considering the individualistic responses of plant species, which are influenced by their specific habitat requirements and biotic interactions. For instance, habitat generalist species often have broad environmental …
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Successive Land Surveys as Indicators of Vegetation Change in an Agricultural Landscape
… disturbance conditions have altered the vegetation of the southern Appalachians during the past 200-years. The objective of this research was to identify the nature and timing of these vegetation changes in order to better understand the underlying causes. A total of 304 land surveys were …
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Remote Sensing of Vegetation Change Across a Latitudinal Gradient in the Canadian Arctic
… or local scales. We can apply remote sensing vegetation indices such as the Normalized Difference Vegetation Index (NDVI) to map and monitor vegetation change (e.g., phenology, greening, percent cover, and biomass) over time. It is important to document how Arctic vegetation is changing, as it …
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Fire and Fuels: Vegetation Change Over Time in the Zuni Mountains, New Mexico
… are a region that has been dramatically changed by human interference. Anthropogenically, fire suppression practices have allowed a buildup of fuels and caused a change in the fire-adapted ponderosa pine ecosystem such that the new ecosystem now incorporates many fire-intolerant species. …
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Landscape analysis of vegetation change in coastal Louisiana following hurricanes Katrina and Rita
… resulting in measurable physicochemical changes. This research used remote sensing and field investigations to regionally assess (1) porewater salinity and sulfide impacts to and recovery of coastal Louisiana vegetation communities, and (2) the importance of mineral sediment deposition on …
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Woody vegetation change in response to browsing in Ithala Game Reserve, South Africa
… the impacts of elephants and other browsers on vegetation in large, open areas, less is known of their effects in restricted areas. The woody vegetation in Ithala Game Reserve, a fenced conservation area of almost 30 000 ha, was monitored annually from 1992 to 2000 to assess the impact of …
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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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Vegetation change and vegetation type stability in the Cape of Good Hope Nature Reserve 1966 - 2010
Vegetation stability was investigated within the Cape of Good Hope Nature Reserve by incorporating three vegetation surveys spanning a 44 year time period. The goals of this study were to investigate changes in overall species diversity within the reserve, stability of community composition within …
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The Use of Remote Sensing to Map and Monitor Coastal Dune Vegetation Change at Southampton, Ontario, Canada
… complex provides habitat for a diverse range of vegetation species, some of which are endemic, rare, and threatened. This research mapped and monitored dune vegetation change at the Chantry Dune system from 2005-2012 using multi-temporal normalized difference vegetation index (NDVI) images …
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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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Spatio-Temporal Vegetation Change as related to terrain factors at two Glacier Forefronts, Glacier National Park, Montana
… is considered a clear sign of global climate change. Although a rich body of work has documented glacial response to climate warming trends, comparatively little research has assessed vegetation change in recently deglaciated areas. In this study, we assess vegetation change at two glacier …
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