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 16 of 16 for “"vegetation distribution"”.
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Vegetation distribution and site relationships in an Appalachian oak forest in southwest Virginia
… The objective was to determine the present distribution patterns of tree species and community types and to relate their occurrence to site factors. Of the 52 tree species recorded, the dominants in order of decreasing importance were Acer rubrum, Quercus rubra, Liriodendron tulipifera, …
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Modelling vegetation dynamics and their feedbacks over Southern Africa in response to climate change forcing
The importance of vegetation feedbacks to the atmosphere has been highlighted in many recent research studies. The influence of climate on vegetation has long been established, and climate has regularly been used to predict vegetation distribution. However, the influence of vegetation on climate is …
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Spatial and temporal dynamics of the terrestrial carbon cycle : assimilation of two decades of optical satellite data into a process-based global vegetation model
This PhD thesis presents the spatio-temporal distribution of terrestrial carbon fluxes for the time period of 1982 to 2002 simulated by a combination of the process-based dynamic global vegetation model LPJ and a 21-year time series of global AVHRR-fPAR data (fPAR – fraction of photosynthetically …
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Vegetation cover change on Tindfjöll mountains, Iceland, assessed by aerial photographs, topography, and climate
… understand the relationship between climate and vegetation cover, which is playing an important role, as a carbon sink, for biodiversity, and for protecting against natural hazards. Less studied but equally important is to understand how mountain areas are responding to climate warming and how …
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A wetland vulnerability assessment : consequences for the avian communities of saltmarshes
… objectives: to classify saltmarsh and reed bed vegetation distribution; to assess the vulnerability of these habitats to sea level rise; to determine the impacts of sea level rise on nesting avifauna; and to derive recommendations for conservation practice.Vegetation classification methods using …
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The late holocene vegetation history of Lake Farm, South Eastern Cape Province, South Africa
… (34°S,25°30'E) has provided a high- resolution vegetation history of the area for the last 2200 years. Detailed identification and counting of the fossil pollen resulted in the generation of a pollen diagram. Changing frequencies in fossil pollen over time are represented, and inferences are …
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Simulating and quantifying land-surface biogeochemical, hydrological, and biogeophysical processes using the Community Land Model version 4
… Carbon and nitrogen cycle from the atmosphere to vegetation communities and soil micro-organisms through their transformation in inorganic and organic pools. Ecosystem equilibrium, which is usually disturbed by extreme events (e.g., fires or drought), depends on the speeds of carbon and nitrogen …
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Assessing the Utility of Imaging Radar for Identifying White Sand Vegetation Structure
<p>White sand vegetation communities are wide spread across South America; found in Peru, Venezuela, Brazilian Amazon and Guyana. They are distributed in patches ranging from <1 km2 to greater than tens of square kilometers and their origins and locations are still not well understood. The …
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Relationships of piñon juniper woodland expansion and climate trends in the Walker Basin, Nevada
Landscapes are in constant flux. Vegetation distributions have changed inconjunction with climate, driven by factors such as Milankovitch cycles and atmosphericcomposition. Until recently, these changes have occurred gradually. Human populationsare altering Earth's systems, including atmospheric …
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Social Demands and Geospatial Distributions of Urban Green Spaces and Blue Spaces
… to explore their spatial and functional distribution at different spatial scales. By integrating Geographic Information Systems (GIS), remote sensing, and LiDAR data, I adopted a multidimensional exploration of blue and green spaces in central Texas that addresses three key issues: the …
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River - Riparian Vegetation Interactions
… attention will be focused on plants. Riparian vegetation is of great interest because of its double role, passive and active. In the first role (i.e. the passive one) the biological activity is not considered and only the effect of vegetation morphological and mechanical characteristics on …
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Climate-driven growth of croplands and grasslands: analysis and modeling at regional scale
… of the interactions between climate and vegetation is a key issue in environmental sciences, and especially for researchers studying climate change impacts on terrestrial ecosystems. Indeed in order to better predict changes in ecosystems productivity, scientists are investing time and e …
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Bio-physical controls on tidal network geomorphology
… associated landforms and biotic components (e.g. vegetation), to eventually guarantee the success of current and future restoration practices. Accordingly, this research aims to bring further insights into the bio-physical controls on the geomorphology of tidal networks. To this end, a combination …
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Firestorms in a mesic savanna-forest mosaic
… the bistability of savanna and forest vegetation and present evidence for catastrophic regime shifts in these mosaic systems. What sets it apart from previous research is the boundary between vegetation types is naturally occurring, not the result of logging within forests and the …