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 45 for “"Nutrient pollution"”.
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Understanding morphological responses of <em>Typha</em> (cattail) species to nutrient pollution
1 PDF file (vii, 40 pages)
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A systems approach to managing nutrient pollution in Cape Cod's coastal waters
… the world severely impaired. Excessive nutrient enrichment in water bodies, also known as nutrient pollution, is one of the leading impairments in coastal waters. Algal blooms, dead zones, and fish kills are spreading because of the nutrient pollution. This thesis presents a systems …
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The Effects of Multiple Stressors on Stream Communities: The Convergence of Drought, Nutrient Pollution, and Invasive Species
… common stressors in these systems, drought, nutrient pollution, and invasive species, have wide-ranging effects on stream population- community- and ecosystem dynamics. We have a broad understanding of how each of these stressors works to influence stream systems independently. However, we …
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All it takes is a nudge: pushing environmental federalism to tackle the massive non-point source pollution problem
Controlling the massive problem of excess nutrient pollution in America's most prominent waters through the Clean Water Act continues to challenge administrators both on the ground and in the courts. Widespread hypoxia in the Gulf of Mexico, impaired waterways in Florida, and a declining fishing …
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Projecting agroforestry adoption and agroforestry water quality trading in the headwaters of the Chesapeake Bay, Virginia, USA
Agricultural nonpoint source nutrient pollution is the leading cause of water quality impairment in the Chesapeake Bay. Agroforestry, the integration of trees with crops or livestock production, or both, achieves production and conservation objectives on a single plot of land. Agroforestry is …
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Streamside Management Zone effectiveness for protecting water quality following forestland application of biosolids
… are surface applied to forest soils to increase nutrient availability. Retaining streamside management zones (SMZs) can limit nutrient pollution of streams. We delineated 15 m SMZs along three intermittent streams in an 18-year-old Pinus taeda L. plantation. We applied biosolids outside the SMZ …
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Three essays on the spatial analysis of sustainable dairy farming in New Zealand
… with farm-level management practices on nutrient pollution, the interactions between farmers, and the impact of farmer choice on the environment. Spatial spillover effects, which are considered as important issues at either the regional level or farm-level decision-making, are addressed …
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Litter Conditioning is Differentially Affected by Leaf Species, Phosphorus Enrichment, and Light Availability
… basal food resources, such as leaves, nutrient pollution can result in altered food quality and decreased carbon (C) standing stocks. However, the magnitude and mechanisms of this change in quality are poorly understood. Laboratory microcosm studies were conducted to 1) quantify the …
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Nutrient and Bacterial Transport From Agricultural Lands Fertlized With Different Animal Manures
… application of manure is responsible for nutrient and bacterial pollution of downstream waterbodies. Manure application based on the crop phosphorus (P) requirements has been recommended as a viable method to reduce nutrient pollution. A plot scale study was conducted to measure the loss …
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Modeling farmer decision-making using an agent-based model for studying best management practice adoption rates: A typological approach
Nutrient pollution is a significant water quality issue causing algal blooms and hypoxia in watersheds, impacting local aquatic life, industries, and the health and safety of people. The Mississippi watershed and the northern Gulf of Mexico are examples where this is a particular problem. …
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Groundwater contamination at a landfill: a case study of coastal park landfill, Cape Town
The extent of groundwater pollution from landfills varies throughout the year. Studies have shown that rainfall is the greatest contributor to nutrient pollution in groundwater. Therefore, groundwater monitoring that is based on predetermined schedules and fails to consider the effects of rainfall, …
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Regulating farm nutrient runoff : Maryland's experience with the Water Quality Improvement Act
… designed to address nonpoint agricultural nutrient pollution rely almost exclusively on voluntary programs and financial incentives to encourage farmers to adopt nutrient management plans and other best management practices. In 1998, after highly publicized fish kills highlighted …
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Post-implementation re-assessment of agricultural best management practices on watersheds of Conesus Lake: Effects on stream water chemistry and aquatic macroinvertebrate communities
Nutrient pollution is the third largest source of impairment of water quality in rivers and second largest in lakes in the US according to the Environmental Protection Agency (EPA). Agricultural best management practices (BMPs) are intended to improve water quality, reduce sediment and nutrient …
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Assessing the microbial community structure’s diversity associated with nutrients concentration in the natural wetland systems
… soil microbial ecology associated with nutrients concentration. Such knowledge may enhance the improvement in the management and protection of wetland systems, as nutrients are essential for wetland plant growth. Despite their usefulness, they promote toxin-producing cyanobacteria and …
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The threat to South African water security posed by wastewater-driven eutrophication: a proposal for a new regulatory approach
… is severely impacted by eutrophication (nutrient enrichment). As much as two-thirds of the reservoir impounded resource may be affected. Wastewater effluents and/or the integration of wastewater return flows as part of the water balances of many reservoirs constitute the primary source of …
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Application of multi-state financial data for use with the USDA Agricultural Conservation Planning Framework
… Belt region, specifically with regards to excess nutrient pollution. Agriculturally dominated landscapes are one of the major contributors to impairments in waterways at both local and regional scales. As Iowa and other US Corn Belt states continue to navigate water quality issues, spatially …
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Enhanced Biological Phosphorus Removal from Dairy Manure to Meet Nitrogen:Phosphorus Crop Nutrient Requirements
… This has led to greater amounts of excess manure nutrients on farms, increasing the potential for nutrient pollution of water bodies from runoff. The purpose of this study was to determine if enhanced biological phosphorus removal (EBPR) is a viable alternative for managing excess manure nutrients …
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Cumulative Impacts of Stream Restoration on Watershed-Scale Flood Attenuation, Floodplain Inundation, and Nitrate Removal
Severe flooding and excess nutrient pollution, exacerbated by heightened anthropogenic pressures (e.g., climate change, urbanization, land use change, unsustainable agricultural practices), have been detrimental to riverine systems and their estuaries. The degradation of riverine systems can …
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Impact of Stream Restoration on Flood Attenuation and Channel-Floodplain Exchange During Small Recurrence Interval Storms
Extreme flooding and excess nutrient pollution have been detrimental to river health under increased environmental stress from human activities (e.g., agriculture, urbanization). Riverine flooding can be detrimental to human life and infrastructure yet provides important habitat and ecosystem …
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Understanding gully process in two Kansas landscapes
… safety hazards, soil loss, and sediment and nutrient pollution downstream. Across the globe, researchers have found a wide variety of gully growth rates and drivers (Poesen, Nachtergaele, Verstraeten, & Valentin, 2003), but after the late 1900s, very few published gully studies have been done …
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