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 44 for “"soil disturbance"”.
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The impact of soil disturbance on nitrogen partitioning and carbon secuestration in Mediterranean soils
Los incendios forestales pueden ser considerados como uno de los factores más influyentes en la degradación de los suelos en la cuenca Mediterránea. El fuego puede modificar las propiedades físicas y químicas del suelo, y, en particular, alterar la calidad y cantidad de la materia orgánica del …
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Logging in the Streamside Management Zone: Effects of Harvesting System and Intensity on Visual Soil Disturbance
… systems and harvesting intensities on visual soil disturbance were evaluated throughout Virginia and eastern West Virginia. The harvesting systems were a chainsaw/cable-skidder system (manual) and a feller-buncher/grapple-skidder system (mechanized). A total of 118 unique SMZ plots were …
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Investigation of the relationships between biomass reduction, soil disturbance, soil nutrients and weed invasion in basalt plains native grassland remnants in Victoria, Australia
… between biomass reduction (burning and mowing), soil disturbance, soil nutrient levels (N, P and K) and weed invasion in native grassland remnants in Victoria, Australia. The study was carried out at three native grassland remnant sites, Derrimut grassland reserve, Laverton grassland reserve and …
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Timber Harvesting and Site Preparation Effects on Soil Quality for Loblolly Pine Growing on the Lower Coastal Plain of South Carolina
… of nearly-level topography, poorly-drained soils, and high rainfall, which results in a perched water table in some soils that inundates the surface several times each year. Harvesting timber under wet site conditions often results in extensive soil compaction, rutting, soil displacement, …
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Estimating Sources of Valley Fever Pathogen Propagation in Southern Arizona: A Remote Sensing Approach
… spp. The fungi reside in arid and semi-arid soils of the Americas. The disease has increased epidemically in Arizona and other areas within the last two decades. Despite this increase, the ecology of the fungi remains obscure, and environmental antecedents of the disease are largely …
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Reproductive Biology of Alligator Snapping Turtles: Behavior, Reproductive Investment, and Nest Predation
… studied, and I investigated the role of soil disturbance and turtle olfactory stimuli in raccoon responses to artificially constructed alligator snapping turtle nests. Raccoons primarily used soil disturbance cues to detect artificial nests; however, after being detected nests with soil …
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Quantifying Long-Term Hydrologic and NPS Pollutant Response in an Urbanizing Watershed
… Cub Run are identified with periods of increased soil disturbance from urban land development and significantly increased storm volumes resulting from higher mean impervious cover. Long-term summaries of nutrient flux are consistent with literature documenting increased ratios of particulate to …
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A quantitative study of the vegetation of dry and dry-mesic sand prairies in Central and Northwestern Illinois
… Rivers. When compared to typical Illinois blacksoil prairies, these sand prairies are characterized by short vegetation and many species which are more common on prairies further west. Although the greatest amount of remaining high quality prairie in Illinois is in the form of dry and dry-mesic …
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Immediate and Long-Term Behavior of the Evanston Tunnel in Chicago Clay
… settlement is primarily a function of the soil disturbance, OCR, and the volume of groundwater that infiltrates the tunnel.
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An assessment of conservation agriculture adaption by smallholder farmers : a case of Goromanzi, Zimbabwe
… its benefits of promoting better crop yields and soil fertility in a sustainable way as a climate adaptation strategy. This study assesses factors influencing the adoption of conservation agriculture by smallholder farmers in Goromonzi District, Zimbabwe. The study focuses on the following …
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A Comparison of Chipper Productivity, Chip Characteristics, and Nutrient Removals from Two Woody Biomass Harvesting Treatments
… productivity, nutrient removals, and site disturbance. The first biomass harvesting treatment was an integrated harvest where roundwood was merchandized and hauled to the appropriate mill and limbs, tops, and small stems (residues) were chipped for hog fuel. The second biomass harvesting …
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Forest Harvesting Disturbance and Site Preparation Effects on Soil Processes and Vegetation in a Young Pine Plantation
… the beneficial effects of non-crop vegetation on soil quality, nutrient cycling, and biodiversity have not been thoroughly explored. A study was conducted to determine the effects of harvesting-induced soil disturbance, bedding and chemical vegetation control on soil processes and productivity, …
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Pressuremeter testing in miocene stiff clays
… it has proven difficult to obtain reliable soil parameters for stiff clays. Laboratory testing results are often scattering due to the fissures and slickensides in these soils. Alternatively, in situ techniques offer a means to test the soils in place. This study focuses on in situ testing …
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Enhancement of diversity via disturbance and seed addition in two sand prairies dominated by different grasses
… the extent to which the dominant is affected by disturbance. Disturbances that reduce dominant species may enhance community structure due to competitive release, but non-dominant species may require additional types of disturbance that create regeneration microsites, such as reduced litter and …
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Brush packing as a restoration technology to restore grazing capacity after bush control in the North West Province
… function, which involves covering the degraded soil surface with woody branches and/or other organic material, mostly collected after the control of bush encroachment. This treatment on degraded and denuded soil surfaces simulates the protective cover effect of vegetation, along with various …
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The etiology of the decline of eastern white pine (Pinus strobus L.) on Virginia landscapes: a survey of stress factors
… Site quality indicators centered around the soils with soil pH, clay content, amounts of compaction and soil disturbance as the most prominent factors derived from the study. Soil pH averaged 6.95 with a range of 5.9-8.1 for decline habitats; while the pH averaged 5.50 with a range of 5.0-6.0 …
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Harvesting effects on the hydrology of wet pine flats
… causes extensive rutting and churning of the soil surface and may alter the subsurface flow of soil water. An operational-scale experiment was established in 20-year-old loblolly pine (Pinus taeda) plantations to determine the hydrologic response of wet pine flats to wet- and dry-weather …
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Post-Fire Sedimentation and the Risk to Sierra Nevada Water Supply
… fires facilitate sediment transport by removing soil’s vegetative and organic matter layers, changing soil properties, and inducing soil water repellency. Erosion and sedimentation are inevitable post-fire processes, and the predicted increase in large, severe fires and subsequent sedimentation …
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Population genetics of Michaux's sumac, smooth sumac, and their hybrids
… property, Deepwater. Michaux's sumac requires soil disturbance and fire to maintain healthy populations. Before being added to the endangered species list, 47% of populations were extirpated due to habitat loss, fire suppression, and hybridization with smooth sumac (Rhus glabra). Concerns with …
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Harvesting impacts on steep slopes in Virginia
This purpose of this study was to assess ground disturbance from harvesting hardwood stands with conventional rubber-tired skidders on slopes greater than 30 percent in Virginia. Special emphasis was placed on erosion, compaction and soil movement. Ten randomly selected study areas were clear-cut …
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