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 15 of 15 for “"Loss of soil"”.
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Análise espacial das perdas de solo no Estado da Paraíba
This study aimed to analyze the soil losses in the state of Paraiba. To study soil loss equation was used to Universal Soil Loss - USLE coupled to an Information System GIS geographically. By multiplying factors K, R, LS, C and P, were necessary data such as time series of rainfall, soil map, …
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Aspectos físicos e o uso do solo na microbacia do rio da ribeira, município de Santa rita – PB.
… natural resources, has been revealed the source of many problems in the environment, which has been reflected directly decreasing natural resources and quality of life. The erosion and loss of soil are part of these degenerative processes of the natural landscape. The Rio Ribeira’s watershed, …
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Agro-Climatic And Land Suitability Mapping For Switchgrass Grown As A Bioenergy Crop In North Dakota
… for bioenergy production such as corn, soybeans, often results in loss of soil organic matter and release of soil carbon, whereas perennial crops like switchgrass can help build soil organic matter and store more soil carbon due to the large amount of underground biomass they produce. </p> …
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Evaluating post-fire woody mulch effects on soil and stream nitrogen
Severe wildfires often increase nitrogen (N) loss from burned watersheds, impacting downstream water quality, water treatability, and aquatic habitat. Woody mulch is commonly applied to mitigate soil erosion and enhance revegetation post-fire, but it also provides a source of labile carbon (C) that …
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Modeling the Impacts of Rangeland Management Practices on Flow and Sediment Using SWAT
<p>Soil erosion has negative effects including: 1) loss of soil productivity, 2) water quality degradation, and 3) reducing capacity of reservoirs by deposition. For this research, the Soil and Water Assessment Tool (SWAT) model was used in the estimation of flow and sediment yield on a daily time …
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Effects of acidification on the crayfish Cambarus bartonii bartonii in southern Appalachian streams
Population biology and acid tolerance of the crayfish Cambarus bartonii bartonii (Fabricius) from southern Appalachian Mountain streams were investigated. Field studies were conducted primarily from May through October, 1985 at Coweeta Hydrologic Laboratory (U. S. Forest Service Southeastern …
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Population ecology of Pinus pungens in pine-oak forests of southwestern Virginia
I studied aspects of the population ecology of table mountain pine, <i>Pinus pungens</i>, in pine-oak forests on Brush Mountain, Montgomery County, Virginia. The objective of this study was to examine the age structure and recruitment dynamics of <i>P. pungens</i>, a fire-adapted conifer, and to …
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Hunger in the Gwembe valley: A case study of Mweemba chieftaincy, 1905-1987
This dissertation reconstructs a history of hunger in the Gwembe Valley Chieftaincy of Mweemba. It covers the period between 19O5 and 1987. Since 1991 - 92, the period in which the study was being worked on, was a drought and hunger year a postscript was written to append to the main text.The first …
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Soil chemistry and ecology on a restoration trajectory of a coastal sandplain forest, Punakaiki, New Zealand
… order to better understand the interactive role of vegetation and soil biogeochemistry on an ecological restoration trajectory on the West Coast of New Zealand. The Punakaiki Coastal Restoration Project (PCRP) was developed to restore degraded land to a more natural vegetation, resembling the …
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Rapid Phytate Quantification in Manures and Runoff Sediments using HPIC
Accurate quantification of phosphorus (P) fractions in manures and agricultural runoff is vital to understanding P dynamics in the environment. Phytate is an organic form of P, with 6 phosphate groups, which is found in manures, but is difficult to quantify due to its affinity for complex formation …
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Studies of genera cytophaga-flavobacterium in context of the soil carbon cycle
… cycle; with specific interest in the cycling of soil carbon. This need is two-fold and interconnected. The global climate change is in-part due to the loss of soil organic carbon and the reduced ability of soils to sequester carbon. Also, to maintain sustainable, high yielding agriculture, …
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Sources of sediments accumulating in the lower Black and Vygekraal Rivers, Cape Town, South Africa
Soil erosion within the catchment areas of the Black, Vygekraal and Elsieskraal Rivers (Cape Town, South Africa) results in sediment transport by these rivers, their tributaries, and the stormwater drainage systems which flow into these rivers. This sedimentary material is subsequently deposited in …
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Climate finance instruments and Kenyan agriculture
Human activities lead to the emission of carbon and carbon equivalents into the atmosphere which leads to climate change. Some of the negative impacts of climate change include increased frequency of flooding and drought. These lead to loss of soil and crucial soil nutrients which affects …
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Modeling the interactions of forest cutting and climate change on the hydrology, biomass and biogeochemistry of a northeastern forest
… Understanding both short- and long-term impacts of harvesting practices (e.g., cutting rotation length, intensity) on forest dynamics is a key factor in developing criteria and guidelines for sustainable forest management practices. Process ecosystem models are useful tools to improve predictive …
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Belowground Carbon and Nitrogen Cycling in a Loblolly Pine Forest Managed for Bioenergy Production
… for forest-based bioenergy feedstocks. Millions of acres of privately and industrially owned pine plantations exist across the southeastern US, representing a vast area of land that could be utilized to produce bioenergy without significant land-use change or diversion of agricultural resources …