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 91 for “"Nutrient dynamics"”.
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Nutrient dynamics in shallow tidally-dominated estuaries
… insight in the short temporal variability in nutrient concentrations, 24-hourly measurements of dissolved nutrients were conducted over four periods (winter, summer, start of spring, and end of spring) within one year in Te Puna and Waikareao estuaries. The nitrate and ammonium concentrations …
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Temporal Nutrient Dynamics in Cool-Season Pasture
Understanding the nutrient dynamics of pastures is essential to their profitable and sustainable management. Tall fescue [Schendonorus phoenix (Scop.) Holub.] is the predominant forage species in Virginia pasturelands. Although tall fescue pasture is common, little research has attempted to …
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Nutrient Dynamics of Forest Communities in Central Illinois
Four separate investigations of nutrient cycling in forests were conducted at Robert Allerton Park, 7 km southwest of Monticello in east central Illinois. Research was conducted in the two dominant forest types of the region: (1) a floodplain community (Acer saccharinum dominant), and (2) an upland …
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Nutrient dynamics in the Lake Manassas (Virginia) watershed
… suggested phosphorus to be the limiting nutrient. The Vollenweider model was applied to illucidate the relative impacts of South Run and Broad Run on the lake. While Broad Run contributed the vast majority of flow to the reservoir, higher concentrations of algal nutrients, nitrogen and …
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Algal Succession and Nutrient Dynamics in Elephant Butte Reservoir
… Butte Reservoir, New Mexico to understand nutrient dynamics and algal response during a three year period. The model chosen for this study was CE-QUAL-W2 because of its proven ability to represent hydrodynamics and the ability to represent multiple algal groups. Elephant Butte has been …
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Periphyton-nutrient dynamics in a gradient-dominated freshwater marsh ecosystem.
… the factors influencing the development of a nutrient availability gradient in a wetland ecosystem and the subsequent controls to, and feedbacks from, the structure and function of the periphyton community were investigated. Field surveys, field experiments, and a laboratory experiments were …
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Nutrient Dynamics in Stormwater Runoff from Green Roofs with Varying Substrate
… varying treatments, and (3) study the release of nutrients over time from the green roofs with added compost. Our results show that after an initial flush of nutrients from green roofs with added compost, many nutrient concentrations, such as total organic carbon (TOC), total nitrogen (TN), …
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Microbial and metazoan effects on nutrient dynamics during leaf decomposition in streams
I investigated the drivers of nutrient cycling by heterotrophic microbes during leaf decomposition in streams. My research addressed two overarching questions: 1) how do exogenous and endogenous factors interact to drive microbial nitrogen (N) cycling during organic matter decomposition in stream …
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Influences of Mountainside Residential Development to Nutrient Dynamics in a Stream Network
… system but also aquatic systems by changing the nutrient input from the terrestrial to aquatic. However, the impacts of mountainside residential development on stream ecosystems are complex because interactions between in- stream process and hillslope soils control in-stream nutrient dynamics, …
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Spatial Drivers of Ecosystem Structure and Function in a Floodplain Riverscape: Springbrook Nutrient Dynamics
On riverine floodplains, reorganization by fluvial processes creates and maintains a mosaic of aquatic and riparian landscape elements across a biophysical gradient of disturbance and succession. I hypothesized that ecosystem processes in spring brooks would differ spatially across biophysical …
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Spatial Drivers of Ecosystem Structure and Function in a Floodplain Riverscape: Springbrook Nutrient Dynamics
On riverine floodplains, reorganization by fluvial processes creates and maintains a mosaic of aquatic and riparian landscape elements across a biophysical gradient of disturbance and succession. I hypothesized that ecosystem processes in spring brooks would differ spatially across biophysical …
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The role of zooplankton - phytoplankton community interactions in the nutrient dynamics of Lake Chapala, Mexico.
I investigated ammonia nitrogen (NH^-N) regeneration and grazing by zooplankton and their effects on phytoplankton production and biomass. Two sets of experiments were conducted on samples from Lake Chapala, Mexico from September through December, 1983. One set of experiments was designed to …
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Assessing Respiration Rates and Nutrient Dynamics of Aritifical Reef Biofilms and Bacterioplankton in the Mississippi Sound
… bacterial growth, community respiration, and nutrient dynamics at four artificial reef habitats in the Mississippi Sound. Biofilm samples were also collected from settlement plates deployed at each site and were analyzed for 813C and 81sN stable isotope content. Respiration rates were always …
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Nutrient dynamics and their control in land use systems of forest margins in Central Sulawesi, Indonesia
In dieser Studie wurden Veränderungen von Bodenparametern nach Brandrodung des Regenwaldes in Zentral-Sulawesi, Indonesien, untersucht. Zusätzlich wurde die Nachhaltigkeit verschiedener Landnutzungssysteme in Bezug auf Bodenfruchtbarkeit bewertet. Das Untersuchungsgebiet ist durch fortschreitende …
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The influence of sediment nutrient dynamics on the response of lake ecosystems to restoration and climate change
… a direct influence on lake water temperature, nutrient loads, phytoplankton abundance and chemistry. However, little is known about the potential effects of future climate change on lake water quality. Understanding the dynamics, abundance and availability of nutrient pools in lake bottom …
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Computational modeling of tumor cell growth as a function of nutrient dynamics guided by time-resolved microscopy
The varying and extreme nutrient conditions found in the tumor microenvironment force reprogramming of metabolism in tumor cells. This metabolic reprogramming has been identified as a hallmark of cancer. This dissertation focuses on the development and validation of an experimental-mathematical …
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EFFECT OF COVER CROPS ON NUTRIENT DYNAMICS AND SOIL PROPERTIES IN CORN-SOYBEAN ROTATION IN SOUTHERN ILLINOIS
… in the Midwest US can result in significant nutrient leaching to groundwater and surface waters, which contributes to eutrophication and hypoxia in the Gulf of Mexico. A promising strategy to control nutrient leaching and sediment runoff loss during winter fallow period is the use of cover …
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Methane and nutrient dynamics in a tidal flat area of the Southern North Sea: time-series and budgets
Um die biogeochemische Dynamik von Methan und der Nährstoffe Si(OH)4, PO4, NO2 und NO3 im Watt der Südlichen Nordsee zu untersuchen und zu bilanzieren wurde ein System zur kontinuierlichen Messung dieser Parameter entwickelt und auf einer permanenten Messplattform bei Spiekeroog installiert. Die …
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Soil-plant-herbivore interactions and nutrient dynamics in semi-arid grazing systems in northeastern Brazil and western USA
Nutrient cycling, availability, and use efficiency are key issues of sustainability and control important aspects of ecosystem function. In the series of studies in this dissertation, we evaluate how human-induced disturbances and interactions between soil, plants, and herbivores influence nutrient …
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Nutrient dynamics of the forest floor in an Appalachian oak forest stand following clearcutting and whole-tree removal
Experiments were conducted to monitor nutrient dynamics in the forest floor of an upland Appalachian oak forest stands following clearcutting and whole-tree removal. Samples from the L, F, H, and A₁ layers were collected during June, August, and November of 1979 and 1980. Monthly litterfall was …
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