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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 13 of 13 for “"Changes in soil properties"”.
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Changes in soil properties under experimental tree plots on the Isle of Rum
The ecological importance of native woodland in the Scottish Highlands and Islands is widely acknowledged and many calls for its expansion have been made. Much research into the effects of such an expansion on the above-ground ecosystem has been undertaken, but little is known about the impact it …
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Changes in soil properties and their effects on maize productivity following sesbania and pigeon pea improved fallow system in Eastern Zambia
Soil degradation is a major constraint in most sub-Saharan African countries. short fallow rotations of 1-3 years have a potential to increase maize yield without additional inorganic nitrogen fertilizers. The mechanisms responsible for improved maize yield are partially understood. therefore the …
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Compost Application Practices for Revegetating Disturbed Soils
… development alters the physical and chemical properties of soil which presents challenges for vegetation establishment. Compost, when applied as a soil amendment, can help to ameliorate these challenges. In field trials, we evaluated the effect of surface-applied composts and standard …
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Compaction of soil by a vibratory roller: a theoretical description
This study models the compaction of soil by a vibratory roller compactor and examines changes to current designs that may provide more efficient compaction. The modeling of the soil differs from previous analyses of the compaction process in its use of a distributed-parameter characterization of …
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Determination of Seismic Earth Pressures on Retaining Walls Through Finite Element Analysis
<p>Seismic pressures on displacing or rigid retaining or basement walls have been derived based on the original work of Mononobe and Okabe, who used a shake table to calculate dynamic pressures of displacing retaining walls existing in cohesionless soils. Since this original work was done over …
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Successive Land Surveys as Indicators of Vegetation Change in an Agricultural Landscape
… the vegetation of the southern Appalachians during the past 200-years. The objective of this research was to identify the nature and timing of these vegetation changes in order to better understand the underlying causes. A total of 304 land surveys were collected for a small agricultural …
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Vegetation patterns and plant reproductive processes in the succulent Karoo
… Karoo Research Centre (33°1 0'S, 22°17'E) in the semi-arid southern Succulent Karoo, South Africa. It begins with an investigation into the roles of soil properties and competition in explaining variation in species distributions. The aim was to investigate changes in soil properties …
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Regenerative agriculture and soil carbon storage in the Upper Corn Belt
… conversion, agricultural mismanagement, and topsoil erosion have depleted global soil organic carbon (SOC) stocks in the top two meters of soil by an estimated 133 petagrams (Pg), resulting in a significant SOC debt. Regenerative cropping practices, such as no-till and cover cropping, are …
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Changes in Streambank Erodibility and Critical Shear Stress Due to Surface Subaerial Processes
Previous studies have shown that soil erodibility and critical shear stress are highly influenced by weathering processes such as freeze-thaw cycling and wet-dry cycling. Despite over forty years of research attributing changes in soil properties over time to climate-dependent variables, little …
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Modeling recession flow and tracking the fate and transport of nitrate and water from hillslope to stream
… forested watersheds with similar nitrogen loading, geology, and vegetation, which suggests the importance of understanding differing internal retention mechanisms. Transport should be studied at the hillslope scale because the hillslope is the smallest unit with spatial and temporal resolution …
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Using palm-mat geotextiles for soil conservation on arable loamy sands in the United Kingdom
… studies on the effectiveness of geotextiles on soil erosion rates were conducted in laboratory experiments for <1 h. Hence, at Hilton, East Shropshire, UK, this study investigated the effectiveness of palm-mat geotextiles (Borassus and Buriti mats) in reducing rainsplash erosion, runoff and soil …
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Closing the loop: Assessing the viability and environmental risks of human excreta-derived fertilizers in sustainable food systems
There is a need to increase food security and sustainability in food systems to ensure food production for generations to come. Currently, most food production is done through conventional agriculture which relies on synthetic fertilizers. While synthetic fertilizers help to sustain food …