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 26 for “"legacy effects"”.
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Legacy Effects of Long-term Manure Applications on Soil-derived Nitrous Oxide Emissions
… long-term manure applications would produce a legacy (or priming) effect that would result in enhanced N2O emissions following the changeover to a more readily available nitrogen source and that this effect would be relatively short-lived. The impacts of long-term manure application and change …
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Legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting
… secondary factors arise, which have multifaceted effects on soil microbial communities. Of these, alterations to soil moisture are among the most crucial to understanding how microbial functions will change in the face of climate change. As living organisms, microbes must adapt to their …
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Seventy years of changes in riverine woodland cover: Responses to elephants and human legacy effects in Gonarezhou National Park, Zimbabwe
As global biodiversity decreases, the importance of protected areas for protecting biodiversity and ecosystem complexity, is rising. Increasing development and land use change means that protected areas must restrict species to their boundaries to avoid human-wildlife conflict. Populations of …
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A damming history: an analysis on the legacy effects of beaver dams on the composition and structure of a montane riparian ecosystem
… dominated by herbaceous species. Finally, the effects of river incision reduced shrub cover within the valley, restricting communities to the river corridor. This study demonstrated that off-channel, historic beaver ponds function as a refuge for wetland plant species in disturbed riparian …
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Legacy effects of cover crop monocultures and mixtures on soil inorganic nitrogen, total phenolic content, and microbial communities on two organic farms in Illinois
Cover crops can leave behind legacy effects on their soil environments by influencing soil inorganic nitrogen (N) pools, total phenolic content through the release of secondary compounds, and by altering soil microbial communities. I analyzed soils collected during a two-year field study and aimed …
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Historical and contemporary drivers of greenhouse gas emissions from upland soils
… dioxide (CO2). In addition to the contemporary effects of ponding on soil O2 concentrations, repeated ponding of soils in depressional areas can alter soil biotic and biotic properties, establishing soil drainage legacy effects associated with microtopography that may control variation in soil …
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Environmental Planning, Urban Development, and the Making of Environmental Injustice in Minneapolis
… in the construction of racialized space, 2) the legacy effects of racial discrimination and implications for planners, and 3) the role of planners in producing and maintaining environmental injustices.
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THE EFFECTS OF HISTORICAL AND CURRENT LAND USE ON THE HABITAT USE AND COMMUNITIES OF URBAN WILDLIFE IN THE WASHINGTON, D.C. METROPOLITAN AREA
… valuation in Washington, D.C. to identify any legacy effects of racist and discriminatory urban planning on mammal communities. While I did not find any relationship, I did find similar mammal communities across the city regardless of neighborhood categorization and I derive management …
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Statistical and process-based models for understanding species distributions in changing environments
… (site accessibility) as well as the continuing effects of past events, e.g. disturbances (site legacy). Existing approaches to predict species distributions either (i) correlate observed species occurrences with environmental variables describing abiotic limitations, thus ignoring biotic …
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Ecological legacies from grasslands to agroecosystems : microbial ecology, plant community assembly, and resource allocation
… expansion of municipal infrastructure and the legacy effects of agriculture play key roles in the continued alteration of the soil profile. The response of the soil physical, chemical, and biological properties along with the plant community composition in response to land-use changes is poorly …
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Toward a More Integrative Approach to Quantifying the Ecological Impacts of Invasive Plants
… ecological impact, I examine the potential for legacy and temporal effects in newly established and recently managed invasions, and I measure ecological impact of co-invaded ecosystems. Through these studies, I find that magnitude, and not direction, of impact better represents actual ecosystem …
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Floristics, Conservation, and Restoration of Virginia's Piedmont Grasslands
… regeneration is limited by post-agricultural legacy effects. Finally, an evalu- ation of 30 years of management in Shenandoah National Park revealed that longer intervals between prescribed burns were associated with increases in woody plants and decreases in forbs, indicating that frequent …
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The Training, Use, and Water Quality Effects of Riparian Proper Functioning Condition Assessment in Nevada
… Management of these systems is complicated by legacy effects of historic management, contrasting and often conflicting perspectives among stakeholders, and differing philosophies and mandates among the various land management agencies charged with their care. Recently, there has been interest …
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Lower Scotts Creek Floodplain and Habitat Enhancement Project
… limiting, especially during drought years. The legacy effects of historic land use practices, including dredging, wood removal, and the construction of levees, continued to limit refuge and rearing opportunities. A restoration project was implemented to improve refuge and rearing opportunities …
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Interactive effects of chronic nitrogen addition and pulsed deluge events on community structure and function of the shortgrass steppe
… and pulsed deluge events can generate unexpected effects on ecosystem function. The third and final chapter of this dissertation assessed the legacy effects of deluge pulse amid ongoing nitrogen press. We monitored post-deluge plots and found unexpected production legacies that were not predicted …
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Using patchy plant invasions to understand how diffuse interactions modify facilitation and competition
… <i>Centaurea</i> growth through shade and litter effects and attenuated the competitive effects of <i>Centaurea</i>. While <i>Pinus</i> litter strongly suppressed <i>Centaurea</i> establishment, <i>Festuca</i> and <i>Bromus</i> where much less effected. The native plant community and <i>Bromus</i> …
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Using patchy plant invasions to understand how diffuse interactions modify facilitation and competition
… <i>Centaurea</i> growth through shade and litter effects and attenuated the competitive effects of <i>Centaurea</i>. While <i>Pinus</i> litter strongly suppressed <i>Centaurea</i> establishment, <i>Festuca</i> and <i>Bromus</i> where much less effected. The native plant community and <i>Bromus</i> …
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Assessing the effects of trampling and bait-collecting on population, morphological and reproductive metrics of a key ecosystem engineer in Langebaan Lagoon
… reproductive biology of sandprawns. Adverse effects on sandprawn reproductive outputs are a cause of great concern, as chronic legacy effects of recreational disturbance may lead to population-level consequences, and thus compromise the vital ecological functions that these crustaceans …
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