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 21 for “"base cations"”.
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Effects of Freshwater Salinization and Associated Base Cations on Bacterial Ecology and Water Quality
… in water with elevated Mg2+ relative to other base cations, suggesting that different salt sources and ion profiles can have varied effects in FIB survival. Thus, freshwater salinization could cause accumulating concentrations of FIB even without increased loading, increasing the risk of …
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Acidification and eutrophication of forests on sandy soil: effects of forest type and deposition load
… nitrate and sulphate, and also more so-called base cations and aluminium are seeped to the groundwater. Besides a higher pollution of ground and surface water with nitrate and sulphate, the related higher seepage of so-called base cations and aluminium furthermore accounts for a higher …
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Vegetative Potential to Reduce Total Dissolved Solid Nutrient Ions Generated from Reclaimed Mine Lands in Central Appalachia
… ratios of common TDS contributing ions [i.e., base cations Ca2+, Mg2+, Na+, K+ (RBC), sulfate (RSO42-), and total Ca2+, Mg2+, Na+, K+, SO42- (Rtotal)] between un-vegetated and vegetated plots. Strong Spearman correlations were found between RTotal, RBC, and RSO42- during the peak growing …
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Enhancing Economic and Environmental Value in Soybean Production through Value-Added Innovation
… affecting fatty acid profiles. A metabolite-based genome-wide association study identified 20 single nucleotide polymorphisms (SNPs) significantly associated with 21 fatty acid ratios. These SNPs were linked to genes involved in phytohormone-mediated stress responses and offer potential …
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Sulfate Dynamics and Base Cation Release in a High Elevation Appalachian Forest Soil
… to water leaching as the preliminary step to a base release study in which each soil will be placed under simulated acid rain and evaluated for base cation release and subsequent changes in soil chemistry. Experiments with SO₄²⁻ adsorption and desorption divide the soils into two categories: (i) …
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Environmental geochemistry of soils and stream sediments from Anka and Birnin-Gwari artisanal gold mining areas, NW Nigeria
… in silica, zirconium and markedly depleted in base cations due to intense tropical weathering. The results further show that artisanal mining has only caused severe contamination, especially with respect to Pb and Cu, in the Anka area, highlighting the importance of mineralogical differences in …
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Carbon and nitrogen cycling in watersheds of contrasting vegetation types in the Fernow Experimental Forest, West Virginia
… with planted forests have important implications for sustainable forest management and associated water quality. The purpose of the research for this dissertation was to explore how N deposition will affect the long-term health, productivity, and carbon (C) and N sequestration of conifer …
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Catchment Structure Regulates Hydrodynamic Drivers of Chemical Weathering in Shallow Forest Soils
… of dissolved organic carbon (DOC) and base cations to explain spatial patterns in chemical weathering in a forested headwater catchment. In the first chapter, relationships between hydrologic behavior, fluxes of weathered elements, and the extent of soil elemental loss across landscape …
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Oligotrophication of downwind boreal lakes caused by oil sands-derived enhanced nutrient deposition
… such as reactive nitrogen (Nr) species and base cations, which can fertilize downwind lakes in the boreal forest of Saskatchewan. However, to address the potential impacts of nutrient deposition on these algal communities, interpretations must occur in the context of ongoing regional climate …
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Regional Nutrient Budgets in Forest Soils in a Policy Perspective
… of the results in a policy context. Estimates of base cation budgets showed that the pools of exchangeable base cations are decreasing and that the stores are being depleted at rates that could lead to negative effects within the period of one forest rotation. The whole-tree harvesting scenario …
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BIOCHAR AMENDMENT TO IMPROVE SOIL PRODUCTIVITY WITH PARTICULAR EMPHASIS ON THE INFLUENCE OF SOIL TYPE
… mainly positively, especially pH, CEC, base cations, field capacity, saturated hydraulic conductivity and some micronutrients. Positive yield responses appeared to be predominantly due to the influence of biochar on soil hydrology, increasing water-holding capacity on sandy soils in dry …
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Impact of pine plantations on the form and mobility of nitrogen in soils of the eastern escarpment region of South Africa
… electrical conductivity (EC) and pH. Extractable base cations, acidity and inorganic nitrogen (NH₄+ and NO₃-) were also analysed after extraction with NH₄OAc or KCl solutions. The laboratory experiments, intended to investigate the apparent differences in soil N transformations and mobility …
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Fly ash impact in forest ecosystems in Northeastern Germany – an assessment and regionalization approach
… the spatial assessment design and the hereon based approaches for up-scaling and correlation of magnetic susceptibility with selected chemical characteristics. • Chapter 5 “Results” presents results of the spatial modeling and linear regression based approach to use ferrimagnetic …
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The geochemistry of fossil termite nests in Calitzdorp, Western Cape, South Africa
… the host soils. The enrichment of exchangeable bases derived from organic matter, including termite frass, and upward groundwater movement frequently leads to post-construction carbonate precipitation within termitaria. Fossil termitaria near Calitzdorp, Western Cape, South Africa, were …
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Multiple ecosystem services in smallholder agriculture
… into the ecological origins and social implications of ecosystem services, the benefits ecosystems provide to society, is predicated on the downward trends observed for many services. Current work increasingly emphasizes how interactions among ecosystem services (synergies and trade-offs) …
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A spatial and temporal study of the carbon cycle; the role of carbonates in buffering Earth’s climate
… given the residence time of carbon and base cations in the ocean. Therefore, a Cenozoic palaeo-record of stable Mg isotopes in seawater is presented, and potential drivers of carbon redistribution between the OA-system are assessed.
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Effects of Acid Deposition and Changing Climate on the Hydrochemistry and Critical Loads of Watersheds in the Adirondack Region of New York
… primarily due to the depletion of exchangeable base cations, net mineralization of organic sulfur and nitrogen and release of previously retained SO42- and NO3-, and increases in concentrations of naturally occurring organic acids from soil. The future recovery of stream chemistry from acidic …
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Nutrient fluxes and soil microbial processes
… organic matter, pH, cation exchange capacity, base saturation, exchangeable cations), soil microbial activities (net N mineralization, potential nitrification, basal respiration) and microbial biomass (microbial biomass C and N) were measured under broadleaves and spruce. Soil chemistry of this …
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Modeling the interactions of forest cutting and climate change on the hydrology, biomass and biogeochemistry of a northeastern forest
… resulting in an accelerated decline in soil base saturation, to values lower than those anticipated from the effects of acid atmospheric deposition alone, and a slower recovery pattern during forest regrowth by the end of the simulation period (2100). A first-order sensitivity analyis showed …
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Nitrogen deposition and nitrification in coniferous forests’
… in the soil and leached, causing loss of base cations or mobilisation of phytotoxic aluminium. Nutrient imbalances due to high soil solution NH4/cation ratios or damaged root systems may also occur. The fate of the incoming NH4 is central to determining the effects on the ecosystem, and is …
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