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 37 for “"Nutrient Addition"”.
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Grass invasion in urban lowland fynbos fragments on the Cape Flats : does nutrient addition play a role?
… The observation in other parts of the world that nutrient additions from deposition of airborne pollutants were responsible for increased dominance of grass in natural ecosystems led us to test whether this was the case on the Cape flats. Phytometers were used to gauge the favourability for growth …
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Consequences of nutrient enrichment for soil organic matter cycling in grasslands
… activities have increased the availability of nutrients, such as nitrogen (N), phosphorus (P), and potassium (K), worldwide. Since alterations to nutrient cycles influence carbon (C) fixation and decomposition processes, nutrient enrichment affects global C stocks -- such as soil C. Carbon in …
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Investigating petroleum oil bioremediation strategies for crude oil contaminated mining sites in Mpumalanga, South Africa
… great toxic dangers. Bioremediation, involving nutrient addition, being an economical and eco-friendly approach, has emerged as the most advantageous water clean-up technique for contaminated sites containing toxic metals and organic pollutants. This study investigated the effectiveness of …
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Chemical reduction and oxidation combined with biodegradation for the treatment of a textile dye wastewater
… was inhibitory to biological degradation. Additional tests were conducted with sodium hydrosulfite. These included reductions followed by pH adjustment, nutrient addition, pH adjustment and nutrient addition, and lime addition. These tests were also successful in reducing the color but were …
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The ecophysiological significance of insectivory as well as nitrogen and phosphorus availability to sundew nutrient cycling, growth, and success
The impact of nutrient addition on growth and nutrient accumulation in insectivorous plants was studied in field populations and greenhouse plantings. Drosera rotundifolia was studied in the field, and D. binata var. multifida and D. capensis were studied in long-established plantings in the …
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Effects of Elevation and Nutrient Availability On the Primary Production of Spartina Alterniflora and the Stability of Southeastern Coastal Salt Marshes Relative to Sea Level Rise
… elevation. This study looked at the impact of nutrient availability and location in the tidal frame on plant primary production and growth range. Nutrient addition (nitrogen and phosphorus) and manipulation of the growth elevation were used to determine their effects on S. alterniflora above …
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Microbial responses to plant functional types and historical resources additions in the shortgrass steppe
Nutrient addition in rangelands is an appealing way to increase plant biomass and quality, but little is known about the long-term effects of these additions on soil microbial activity and nutrient cycling. In addition, microbial activity may be affected by plant functional types (PFT) through …
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The response of grassland carbon cycling to drought events and changes in nutrient availability
… agricultural production, carbon (C) storage and nutrient cycling. In particular, climate change is likely to increase the frequency and severity of extreme climate events, such as drought and the subsequent rewetting event. Yet the effect of drought events will not be consistent across grassland …
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An assessment of factors controlling the biodegradation of benzene in the subsurface environment
… soil properties, and to investigate the role of nutrients on benzene biodegradation in soil. Benzene disappearance over time was measured in aerobic active and control (autoclaved) microcosms prepared with previously-uncontaminated subsurface soils. Soil microcosm experiments were prepared with …
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The effect of biostimulation on geochemical and microbiological conditions in an isolated dolostone fracture
… trial was conducted to determine the effect of nutrient addition on microbial populations in a fractured rock environment. The ultimate goal of this research is to induce bioclogging in rock fractures as a method of in situ containment and remediation of contaminated groundwater. This trial …
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Characterization of TPH biodegradation patterns in weathered contaminated soil
… under all bioreactor configurations using both a nutrient amended water and a water lacking nutrients. Controls were also used to evaluate abiotic losses. Biodegradation rates generally followed a biphasic pattern, initially rapid then followed by a slow or stagnant period. Degradation rates …
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Solid Waste Degradation, Compaction and Water Holding Capacity
… rate and process are refuse shredding, nutrient addition, pH buffering, and temperature control along with moisture enhancement. Municipal Solid Waste (MSW) settlement and field capacity are of significant beneficial interest to achieve maximum utility of landfill volume and compute …
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A computer simulation model for investigating the effect of land application of sludge on runoff water quality
… the nitrogen (N) transformations and subsequent nutrient transport processes which occur in the soil following organic waste applications. CREAMS-NT accounts for nutrient addition through fertilization and rainfall and losses of N by volatilization, denitrification, plant uptake, leaching, and …
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Microcosms and field bioremediation studies of Perchloroethene (PCE) contaminated soil and groundwater
… combinations and concentrations of the following nutrients: soy oil methyl esters (SOME), yeast extract (YE), glucose, lactate, methanol and cheese whey. Bioaugmentation studies used KB-1 bacterial consortium (commercially available culture containing Dehalococcoides). This culture is known to …
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The Investigation of the Soil Seedbank in a Long-term Mowing and Fertilization Experiment
… have shown that fire suppression, anthropogenic nutrient addition, and human-altered hydrology can all have negative effects on aboveground vegetation, such as a decrease in biodiversity. However, little is known about the effects of these factors on seedbanks. Here I investigated how …
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Biological Iron Limitation within Lake Superior's Watershed: Oligotrophic Algal Blooms Along a Land to Lake Gradient
… and stream. Four-day long, trace metal clean, nutrient addition bioassays with iron chelator (EDTA), phosphorus, and iron treatments using whole water were performed to measure growth differences among sites, times, and treatments with concurrent, environmental, elemental characterization. …
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The effect of soil nutrient availability on resource allocation in tropical tree species
… functional variation among tropical trees in nutrient use, and the implications of this functional diversity of tropical forest nutrient and carbon cycling. Through a comparison forest litterfall patterns along a natural fertility gradient and experimental nutrient addition, I show that …
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The response of dune vegetation to human trampling and grazing
… allowed the contemporaneous examination of nutrient addition to these treatments. Multivariate analysis indicated that grazing and trampling each produced distinct changes in species composition. The balance of a competitive interaction between the major grass species is influenced by either …
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Biodegradation of benzene in soil systems
… to investigate the effect of soil properties, nutrient addition and benzene concentration on the biodegradation of benzene in soil systems. More specifically, a primary objective was to correlate measurable soil properties with benzene biodegradation characteristics in the soil. Benzene …
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Nutrient Foraging in Ten Southeast Coastal Plain Plant Species
Plant root system response to nutrient heterogeneity was tested in ten plant species of varying life form and successional status. All plants tested are native to the South Carolina coastal plain. Morphological responses of the root system (scale, precision and discrimination) and overall plant …
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