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 152 for “"Vegetation Structure"”.
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Characterizing vegetation structure using waveform LiDAR
The structure of light penetration through the canopy plays an important role in water, carbon, and energy fluxes between the biosphere and the atmosphere. Total foliage and foliage distribution are major aspects of canopy structure that significantly influence light and vegetation interaction. …
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A Comparison of Vegetation Structure and Composition in Modified and Natural Chaparral
<p>Type conversion of a 12 acre plot of chamise chaparral to grassland in the Mud Flat region of the San Bernardino National Forest, San Gorgonio District, California, was completed in 1967.</p> <p>The conversion was accomplished following standard type conversion techniques for chaparral in …
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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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Influence of vegetation structure and landscape context on the occupancy of shrubland birds
Limited Restriction Lifted for Item 109948 on 2021-02-09T10:15:34Z.
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Breeding bird populations in relation to the vegetation structure of abandoned contour mines in Southwest Virginia
… and structural aspects of the disturbed area vegetation. The territorial mapping method was employed to census bird populations. The number of breeding species, number of breeding pairs, bird species diversity, and number of observed species (breeding or visiting) were determined for each …
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Impacts of meteorology-driven seed dispersal on plant migration : implications for future vegetation structure under changing climates
… the capability of simulating the dynamics of vegetation structure across the global landscape as accurately as possible. In order to serve these needs, Dynamic Global Vegetation Models (DGVMs) are used to describe the current status of vegetation structure and biogeography as well as estimate …
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Development and Application of a Classification System for Undisturbed and Disturbed Tropical Montane Forests Based on Vegetation Structure
Classification of the vegetation was a central part of a DFG-financed analysis of undisturbed and disturbed montane rain forest ecosystems in Southern Ecuador. The aim of the study presented here was the development and application of a classification system based on structural characters for …
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Influence of Vegetation Structure on Density of Northern Bobwhites (Colinus Virginianus) on a Tallgrass Prairie in Southwestern Missouri
… on density of quail estimates relative to vegetation structural responses. Treatments between pastures did not indicate a significant difference in quail density; however, weather impeded scheduled management treatments, potentially influencing vegetation and quail responses. Quail density …
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Vegetation structure and inferred patterns of functional group attrition in a shrub encroached old field and tallgrass prairie mosaic
… present in the seed bank and the standing vegetation. To determine if prairie remnants were responsible for the recolonization of the site after agricultural disturbance, species data were examined on a distance gradient to the nearest remnant. Overall species richness, proportion of …
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Identifying long term patterns and drivers of vegetation structure in an African savanna using stable carbon and nitrogen isotopes
… interactions and feedbacks with one another and vegetation are poorly resolved. Increasing the spatial and temporal scope of studies will help to improve this situation, as demonstrated in recent studies in the spatial dimension in particular. This study aims to investigate vegetation and …
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Bryophyte and macrolichen diversity of the Purdiaea nutans forest in southern Ecuador and its relationship to soil, climate and vegetation structure
… Francisco in southern Ecuador is an azonal ridge vegetation type. Our assumption that the mass occurrence of Purdiaea may be caused by extremely poor soils was not confirmed. From our point of view the development of this monodominant forest was more likely triggered by historical fire events and …
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Long-term effects of prescribed fire on vegetation structure, dynamics, and tree growth in red pine (Pinus resinosa Ait.) forests in north central Minnesota.
… the long-term (>10 years) effects on forest structure and development have not been quantified. We describe the persistence of prescribed fire effects in a mature red pine (Pinus resinosa Ait.)-dominated forest in northern Minnesota, USA over a ~50 year period, as well as the relative roles …
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Role of the thermodynamic regime in ecosystem self-organization and its response to human perturbations
… activities increase throughout the world, the structure and function of Earth systems are consequently altered. Human-induced direct and indirect perturbations, such as changes in atmospheric temperature or the burning or logging of vegetation, alter the thermodynamic environment in which …
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Burning for birds : the response of bird communities to recent fire history in the Serengeti ecosystem
… communities, particularly through its impact on vegetation structure. We mapped fire activity from remote sensing data (2000-2013) and extracted mean rainfall and nitrogen estimates from interpolated maps. We conducted field sampling of bird community composition and vegetation structure at 207 …
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Investigating the efficiency of reforestation approaches in restoring rainforest biodiversity and function
… is often the assumption that once a degree of vegetation recovery occurs, diversity will increase, which equates with restoration of ecosystem functions. Since very few studies have investigated the interaction between the recovery of habitat structure, biodiversity and ecosystem functioning, …
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Abundance and Nesting Success of Acadian Flycatchers (Empidonax Virescens) at Different Scales of Fragmentation in Illinois, United States of America
I also tested the alternative hypothesis that vegetation structure and composition rather than fragmentation may influence nesting success and populations. I measured nest concealment, complexity and heterogeneity of vegetation in the vicinity of the nest, and the plant communities in which the …
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Measures of stand structure and its relationship to site in the south-central Ridge and Valley Province of Virginia
… Mountain in Craig County, Virginia to assess vegetation structure and its relationship to differences in site. A number of structural parameters were measured by height strata to determine vertical stratification patterns. Foliage density was used in subordinate strata (< 5.0 m) as a …
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