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 14 of 14 for “"Phosphorus dynamics"”.
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An introduction to the study of phosphorus dynamics in Rondevlei
Phosphorus is one of the most important nutrients in aquatic environments because of the role that it plays in eutrophication. Increased amounts of phosphorus stimulate excessive growth of nuisance plants, which have negative impacts on waterbodies. Urban runoff and sediment fall under various …
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Water Column Productivity, Calcite Precipitation, and Phosphorus Dynamics in Freshwater Marshes
… calcite (CaCO3) other chemical species such as phosphorus (P) can sorb onto the newly forming crystals and thus be removed from thewater column. While calcite precipitation and subsequent P removal have been studied extensively in lakes, rivers, and streams, they have not been studied in …
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Organic Phosphorus Dynamics and Contributions to Eutrophication in a Shallow, Freshwater Bay
Phosphorus (P) is essential for aquatic life; cycling between both inorganic and organic forms to maintain an ecological balance. Its addition into P-scarce freshwaters, either through terrestrial (external) or sedimentary (internal) loading, may disrupt this balance causing blooms of phytoplankton …
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An Improved Understanding Of Phosphorus Dynamics And Fertility Management In Forage Production Systems
… understanding of forage fertility, especially phosphorus (P), is crucial to optimize profit and reduce environmental nutrient losses. This thesis explores how forage fertility affects productivity in two scenarios. First, a 14-week controlled environment study with Italian ryegrass (Lolium …
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Exploring Phosphorus Dynamics in Mid-Atlantic Soils: A Multi-Scale Analysis Integrating Soil Fertility and Land Management for Environmental Sustainability
The legacy phosphorus (P) in the Eastern Shore of Virginia poses significant challenges for crop nutrition and water quality. Nutrient losses from row crop agriculture and poultry litter applications have potential to cause water quality impairments affecting the environment, aquaculture, and …
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Insights Into Particulate Phosphorus Dynamics and toxic Algal Bloom Events From A 13-Year Sediment Trap Study In Santa Barbara Basin (CA)
… the marine environment, the bioavailability of phosphorus (P) can impact ocean fertility as well as the structure and distribution of phytoplankton communities. Particulate P is of special interest because it is the major mechanism for the transport of P to deep waters and is a source of P to …
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Characterizing water quality, nutrients, and dissolved oxygen dynamics in four Lake Ontario coastal wetlands
… Frenchman’s Bay) vary as net sinks or sources of phosphorus to Lake Ontario. This thesis aimed to improve our understanding of phosphorus dynamics in these wetlands. Continuous multiparameter sondes (dissolved oxygen, conductivity, turbidity, pH) were deployed above sediments, collecting data …
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Impact of Cover Crops on Phosphorus Biochemical Cycling and Dynamics in Texas Agricultural Soils
Phosphorus (P) is a critical yet often limiting nutrient in agricultural systems. This thesis investigates how different soil management practices and preservation methods influence phosphorus dynamics, focusing on phosphatase activity and phosphorus availability in Texas soils. The research is …
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The Role of Nitrogen Availability, Hydroperiod and Litter Quality in Root Decomposition Along a Barrier Island Chronosequence
… Effects on rates of mass loss and nitrogen and phosphorus dynamics during decomposition of a common root type (Spartina patens) and native roots are discussed.</p> <p>Spartina patens roots decayed slower and lost more phosphorus in seasonally saturated swale soils than in well drained dune …
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Legacy Nutrient Management and Remediation in Diverse Agricultural Watersheds
… due to the accumulation of legacy nutrients—phosphorus (P) stored in soils and nitrogen (N) stored in groundwater—that continue to be mobilized long after management changes are implemented. This dissertation evaluates the magnitude, persistence, uncertainty, and mitigation potential of …
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Characterizing phosphate desorption kinetics from soil : an approach to predicting plant available phosphorus
… and economically viable option to study the P dynamics of soils especially for soils where the P pool acting as a source in replenishing the labile portion of P is already identified. The method employed here therefore could act as an analytical tool to approximate successive cropping …