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 23 for “"landscape position"”.
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Environmental and Digital Data Analysis of the National Wetlands Inventory (NWI) Landscape Position Classification System
… production and efficiency. This study assigned landscape position descriptor codes to NWI wetland polygons and correlated polygon environmental properties with public domain terrain, soils, hydrology, and vegetation data within the Coastal Plain of Virginia. Environmental properties were applied …
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Impacts of Landscape Position and Nitrogen Fertilizer on Soils, Carbon and Nitrogen Leaching, and Greenhouse Gas Fluxes from Switchgrass Production in South Dakota
… of nitrogen fertilization rate (N rate) and landscape position on soil pH, soil organic carbon (SOC), total nitrogen (TN), bulk density (ρb), and phosphorus (P) in switchgrass field; (ii) assess the impacts of the N rate and landscape position on dissolved organic carbon (DOC) leaching in …
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Evaluation of pre-taxonomy soil surveys
… Ten random transects were chosen to study soil landscape units which formed the basis for the evaluation of soil boundary placement. The soil landscape units were determined by evaluating slope, parent material, and landscape position for each traversed delineation. Based on a binomial …
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Spatial Drivers of Ecosystem Structure and Function in a Floodplain Riverscape: Springbrook Nutrient Dynamics
… and maintains a mosaic of aquatic and riparian landscape elements across a biophysical gradient of disturbance and succession. I hypothesized that ecosystem processes in spring brooks would differ spatially across biophysical zones because landscape position dictates severity of flood …
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Spatial Drivers of Ecosystem Structure and Function in a Floodplain Riverscape: Springbrook Nutrient Dynamics
… and maintains a mosaic of aquatic and riparian landscape elements across a biophysical gradient of disturbance and succession. I hypothesized that ecosystem processes in spring brooks would differ spatially across biophysical zones because landscape position dictates severity of flood …
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Restoration of Eroded Lands with Biochar as Soil Amendment in South Dakota
… physical and hydrological properties of two landscape positions under a corn (Zea mays L.)-soybean (Glycine max L.) rotation. Three types of biochar including corn stover, ponderosa pine (Pinus ponderosa Lawson and C. Lawson) wood residue, and switchgrass (Panicum virgatum L.) were applied in …
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Site quality factors affecting Acer saccharum, Quercus rubra and Quercus alba abundance and height growth rates in young even-aged stands located in central Missouri
… the effects that soil water, soil nutrients, and landscape position have upon the abundance and height growth rates of sugar maple, white oak, and northern red oak in young even-aged, 5-29-year old, forests of central and east central Missouri in the lower Missouri and lower Osage River valleys. …
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Spatial Variability of Corn Response to Nitrogen Fertilizer: Implications for Variable Rate Fertilization
… catchment area, a terrain attribute related to landscape position, was the most consistent topographic characteristic that affected corn yield and response to nitrogen fertilizer. Prescription maps for variable rate nitrogen fertilization were developed based on the profit maximization of the …
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Multifunctional woody polycultures and their influence on soil organic carbon
… mineralizable N [PMN]), inherent soil and landscape factors were quantified on samples collected using plot- and grid-based approaches to understand their influence on soil organic carbon (SOC) change. Baseline soil samples were collected in the spring of 2015 from land that was managed for …
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Interactive effects of fire and grazing on soil and forage nitrogen dynamics in a tallgrass prairie
… and links to forage quality across heterogeneous landscapes remain incompletely resolved. This thesis examined how fire frequency, grazing, and landscape position interact to regulate N cycling, N retention, and plant–soil feedbacks in tallgrass prairie systems. Using long-term experimental …
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Infiltration controls in a tallgrass prairie at a hillslope scale
… of land use, land cover, soil texture, slope position, slope gradient and slope aspect are a few of the variables influencing infiltration capacity within a uniform soil type. The goals of the thesis are to (1) quantify the spatial distribution of soil hydraulic properties at the surface of a …
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A study of the groundwater travel time distribution at a rural watershed in Iowa: A systems theory approach to groundwater flow analysis
… applied to a tile-drained, agricultural landscape at the watershed scale. Specifically, we examined the two dimensional, steady state groundwater flow characterizing a shallow, unconfined aquifer at a representative watershed. A groundwater flow model of the aquifer was constructed using …
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An approach to studying soil-landscape relationships in Virginia
… methods and techniques were used to examine soil-landscape relationships for residual and colluvial soils of Virginia. Soil micromorphology indicated that although some BC and C horizons in the field appeared structureless, evidence of pedogenic process was observed. These were designated as …
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Extent And Distribution Of Montane Riparian Zone Vegetation And Representation In Protected Areas In The Sky Island Region Of The Southwestern United States
… aridity, temperature, water availability, landscape position, and disturbances. The model can be used with other information to augment understanding of the integrity, connectivity, and vulnerability of riparian zone vegetation in this unique and important region. To analyze the …
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Bat Boxes as Mitigation Tools: Factors Impacting Microclimate and Myotis sodalis Roost Selection
… design. Though during the cool spring months, landscape position and design had little effect on roost suitability, though further investigation is warranted. To promote warm roosting conditions and access to cover upon emergence, we recommend deploying boxes on solar-exposed tree-lined edges. …
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Survival and space use of riparian muskrats (Ondatra zibethicus) within an agroecosystem
… in drainage of most natural wetlands within the landscape. Semi-aquatic species that are associated with these habitats have shifted much of their distribution to riparian habitats that have unstable flow regimes and inundation times that could be related to position within watersheds. Muskrats …
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Tracing carbon flows through Arctic and alpine watersheds
… routing of water and DOM across Arctic landscapes. We traced the mobilization potential of DOM at two landscape positions (hillslope and riparian) and from two soil horizons (organic and mineral) using bromide, and characterized the chemical composition of DOM using solution state 1H-NMR …
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Travertine from Egypt's Western Desert: a terrestrial record of North African paleohydrology and paleoclimate during the late Pleistocene
… head controlled voluminous travertine deposition and dictated its landscape position, and that major depositional episodes were largely synchronous across the Western Desert, suggesting a regional signal. We confirm previous findings that large volume deposition occurred across oasis …
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Deposition and Fate of Atmospheric Mercury in Forested Landscapes of the Adirondack Park, NY
<p>In this dissertation, I investigated the deposition and fate of atmospheric mercury (Hg) to forested landscapes of the Adirondack region in Upstate New York. Despite the fact that forests are the dominant land cover in North America, there has been relatively little research on the deposition, …
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Hydrochemical Dynamics Under Differing Winter Climate Regimes at the Hubbard Brook Experiment Forest
… acidification of stream runoff. Trends varied by landscape position, but the analysis generally revealed slow increases in the pH and acid neutralizing capacity (ANC) in stream water that were associated with decreases in atmospheric deposition of acid anions, sulfate (SO42-) and nitrate (NO3-). …
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