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 61 for “"Plant community composition"”.
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Grazing Management and Plant Community Composition on Bodmin Moor
… It also examines the spatial distribution of the plant communities in relation to environmental gradients and grazing management. Bodmin Moor was dominated by acid grassland and mire with some small heathland fragments. It lacked the cover of ericaceous dwarf-shrubs that define heathland in the …
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Environmental, spatial and temporal drivers of plant community composition in British forest habitat
… functions and as a refuge for many rare plant species in human-modified landscapes. It is however, threatened by global change drivers such as deforestation and the associated fragmentation of remaining habitat areas, along with increased disturbance and exposure to nutrient inputs from …
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Factors affecting plant community composition and dynamics in the Ossipee Pine Barrens, New Hampshire
… Pine Barrens to identify and describe tree community types and investigate factors controlling forest composition and dynamics. Every site had three site-time assemblages (STA's) representing past, present, and future trees. Past (1952) vegetation was calculated based on reverse growth …
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Ecological Drivers of Plant Community Composition in a Patterned Fen at Seney National Wildlife Refuge, Michigan
… Seney National Wildlife Refuge. Percent cover of plant species and environmental variables were measured at 298 relevé style plots across 6 landform types: triangular swamp forests, featureless water tracks, peripheral water tracks, strings, flarks, and ponded sedge lawns. Additionally, several …
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The impacts of seven silvicultural alternatives on vascular plant community composition, structure, and diversity in the southern Appalachians
… The effects of each treatment on the vascular plant community were characterized by changes in species diversity, species composition, exotic species richness, Raunkiaer's life-forms, and growth-forms. Pre-treatment, baseline data, and a randomized block design ensured the precision of …
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Monitoring changes in plant community composition and landscape structure as a result of prescribed burning at Big Oaks National Wildlife Refuge
… study were to produce a baseline description of plant community structure and composition and to describe the landscape-level impacts of fire management within the refuge. These grassland communities are important for managing rare grassland wildlife species, especially Henslow's sparrows. …
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Effects of Landscape Age and Salinity on Plant Community Composition and Productivity in Opportunistic and Constructed Wetlands in the Athabasca Oil Sands Region, Alberta
… how salinity and age influence the vegetation community composition, and the biomass of six dominant wetland plant species (Carex aquatilis, Calamagrostis canadensis, Carex atherodes, Carex utriculata, Schoenoplectus tabernaemontani, and Typha latifolia) found on reclaimed and reference …
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Tracing the New Carbon Cycle From Plant Inputs to Microbial Outputs Across an Arctic Permafrost Thaw Gradient
… C stocks to thaw and become available for decomposition. Since these systems store approximately 1.7 times the amount of C currently in the atmosphere, its decomposition and release as CO2 and CH4 could have profound effects as a positive feedback to climate change. However, the net effect of …
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Relative influence of temperature and disturbance on vegetation dynamics in the Low Arctic : an investigation at multiple scales.
Climate change will affect Arctic plant communities directly, by altering growth and recruitment, and indirectly, by increasing the frequency of natural disturbance. Since the structure of northern vegetation influences global climate, understanding both temperature and disturbance effects on …
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Responses of a Louisiana oligohaline marsh plant community to nutrient loading and disturbance
Aboveground plant community dynamics in the oligohaline marsh at Big Branch Marsh National Wildlife Refuge, Louisiana, USA, were assessed in response to nutrient loading (3 N x 3 P treatments) and disturbance (both planned lethal disturbance and stochastic tropical storm/hurricane disturbance). …
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Avian habitat relationships in the Mojave Desert
The relationship between bird community composition and plant community composition and structure was studied over three years (1994-1996) in a variety of Mojave Desert habitat types. This study addressed two fundamental questions: what plant community characteristics are statistically related to …
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The Effects of Simulated <i> Spermophilus Franklinii </i> Burrowing on Prairie Soil Invertebrate Communities
… squirrel burrows have on soil invertebrate composition, abundance, and diversity by comparing effects of the presence/exclusion of burrows, animals, and their interactions. Through experimental plot manipulation we discovered that simulated burrowing has limited effects on soil invertebrate …
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Establishment of native plant species for livestock forage in silvopasture systems
… each treatment affect establishment of native plant species. The experiment was a Randomized Complete Block Design replicated in 2020 and 2021. Treatment establishment (3 treatments, 3 replications each) began each fall preceding the growing season by no-till drilling the cool season grasses. …
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Algal Biomass Accrual in Relation to Nutrient Availability along a Longitudinal Gradient in the Upper Green River, Kentucky
… Biotic factors include vascular and nonvascular plant community composition. Abiotic factors include underlying bedrock and land-use activities (e.g. agriculture, septic systems). Nutrient availability directly affects growth, productivity, and community structure of primary producers. The …
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Human-Managed vs. Natural Grazing Systems: Exploring Effects of Livestock and Wildlife Grazing at Multiple Scales
… assessing differences across management type in plant community composition following a relaxation of grazing. Results reveal that livestock and wildlife grazers may not be functionally different, but rather exhibit different effects due to the way they are managed (free-ranging vs. herded, etc. …
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The Ecology of Land Managers in Riparian Restoration
… about science and/or nature. The resulting plant community after restoration (as measured by four PCA vectors) was associated with the governing agency or organization and the manner in which each manager prioritized management goals. Finally, managers' attitude toward nature was related to …
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RESTORATION OF NATIVE PLANT COMMUNITIES AFTER ROAD DECOMMISSIONING: EFFECT OF SEED MIX AND SOIL PROPERTIES ON VEGETATIVE ESTABLISHMENT
… 1) short-term effects of road decommissioning on plant community composition, 2) effects of seed-mix seed origin (native vs. nonnative), species diversity, and seeding density on vegetative establishment, and 3) impact of overstory canopy and coarse woody debris on revegetation success on recently …
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RESTORATION OF NATIVE PLANT COMMUNITIES AFTER ROAD DECOMMISSIONING: EFFECT OF SEED MIX AND SOIL PROPERTIES ON VEGETATIVE ESTABLISHMENT
… 1) short-term effects of road decommissioning on plant community composition, 2) effects of seed-mix seed origin (native vs. nonnative), species diversity, and seeding density on vegetative establishment, and 3) impact of overstory canopy and coarse woody debris on revegetation success on recently …
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Trapped? Evidence of changes in relative plant abundance after long-term grazing exclosure across the Tundra.
Herbivores alter plant communities through the effects of selective grazing based on plant palatability. There has also been a perceived link between the relative palatability of plants and ecosystem functions. By changing the relative abundance of certain plant species, prolonged or intense …
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Understanding the complex relationships between climate, vegetation, and foraging behavior of a climate-sensitive alpine mammal in order to explain patterns of persistence
… impacts on mountain mammals. Certain aspects of plant community composition and structure can function as predictors of pika distribution, but understanding the links between climate, forage quality, and foraging behavior is necessary to identify the mediating mechanism. Pika foraging pressure …
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