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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 25 for “"Wetland soils"”.
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Biodegradability of dicamba and 2,4-D in riparian wetland soils
A general review of soils in Virginia counties bordering the Chesapeake Bay reveals that coastal plain soils, especially those most agriculturally productive, are dominantly sandy texture in the subsurface horizon, and have shallow water tables. Considering the high amounts of pesticides used in …
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Salt retention in wetland soils and effects on dissolved organic carbon export
… salt runoff has negative effects on ecosystems. Wetland ecosystems can act as important filters for runoff pollution (e.g., nutrients), mitigating damage to plants and microbes. Wetlands are important sinks for nutrients and pollutants (e.g., road salt) and transformation spots for many nutrients …
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Assessing restoration potential in relict wetland soils: investigating the effect of wetland hydrology on soil microbial community composition and denitrification potential
… influence rates of biogeochemical cycling in wetland ecosystems; specifically, they are strong determinants of rates of denitrification typically observed. Human induced land use changes have significantly reduced the acreage of wetland habitats, with dam building in the eastern United States …
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Dissolved Organic Matter Sources from Soil Horizons with Varying Hydrology and Distance from Wetland Edge
… and export within geographically isolated wetlands (GIW) has implications for the success of wetland restoration efforts intended to produce carbon sinks. However, little is known about how hydrologic connectivity along the aquatic-terrestrial interface in GIW catchments influences carbon …
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Flow and transport in wetland deposits
… that control flow and transport through wetland deposits. Therefore, the objective of this research was to investigate the factors that influenced flow in wetland soils. To accomplish this, Column Experiments, run on a specialized permeameter, were conducted on both re-sedimented and …
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Biogeochemistry of Organotin and Organolead compounds in a Forested Catchment in NE-Bavaria, Germany
… OTC, TML, Sntotal and Pbtotal in the atmosphere, soils, precipitation, and runoff in a forested ecosystem in NE-Bavaria, Germany were investigatedand the inputs and outputs in the solute phase determined. In addition, their ad-desorption and transformation (degradation) in forest soils was studied …
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The Influence of Flooding on Contributions of Spartina Alterniflora Roots to Salt Marsh Soil Volume in a Field Setting
Rapid rates of coastal wetland loss in Louisiana are widely recognized. One important question of wetland sustainability is how volumetric contributions of roots to wetland soils vary under the influence of different hydrologic regimes. The research presented here specifically investigates the …
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A wetland trafficability hazard index based on soil physical properties and site hydrology evaluations
Harvesting of forested wetlands in the Atlantic and Gulf lower coastal plains has the potential to cause intense site disturbance. Often, as a result of poor pre-harvest planning, silvicultural activities are performed on wetland soils highly susceptible to rutting and puddling. Potential decreases …
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Hydrologic Variations Within Created and Natural Wetlands in Southeastern Virginia
<p>The hydrology of wetlands, particularly how wetland soils collect, store, and redistribute water strongly affects how wetland systems function. In created wetlands, construction processes and materials influence the hydrology and consequently, the potential for successful reestablishment of …
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Do wetland characteristics, specifically plant communities, surface water, and soils play a significant role in whooping crane (<i>grus americana</i>) site selection?
… (<em>Grus americana</em>) nest site selection; wetland soils, plant community structure and surface water quality were analyzed throughout nineteen established nest sites and twenty non-nesting wetland sites. Due to past fire management throughout the refuge, the effects of fire history were …
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Oligohaline wetland response and recovery following storm-driven saltwater intrusion in coastal Louisiana
… immediate and long-lasting changes to coastal wetland plant communities and soils by changing the environmental conditions in which they exist. Here I examined the impacts of storm-induced saltwater intrusion and post-intrusion conditions on the structure and growth of an oligohaline wetland …
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Biodegradation of pesticide and indolic compounds under methanogenic conditions
… using serum bottle microcosms containing wetland soil inocula obtained from three different sites. Pesticides were monitored by high-performance liquid chromatography (HPLC) and the production of methane was measured with a gas chromatograph (GC). Dicamba was the most susceptible to …
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Fate of metals in presence of minerals and mineral-organic assemblages
… fate of trace metals added in dissolved form to soils and sediments collected from three different natural aquatic systems, (iii) to determine the role of available Cu in a biogeochemical process in natural aquatic systems, and (iv) to understand the mobility behavior of trace metals from wetland …
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Denitrification and greenhouse gas emissions from cultivated and wetland alluvial soils
… practices (BMPs) to reduce NO3 loss and wetlands restoration to remove NO3 through denitrification are critically needed. The objectives of this research were to determine factors controlling denitrification potential of different landscape units in an agricultural watershed and quantify …
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Linking nitrogen biogeochemistry to different stages of wetland soil development in the Mississippi River Delta, Louisiana
Extensive wetland loss and nutrient-enhanced eutrophication occur across the Mississippi River delta and include newly emergent landscapes, in the early stages of ecological succession, and older landscape formations, with fully developed ecological communities. Here I tested how the anthropogenic …
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Quantifying biophysical and biogeochemical influence on northern high latitudes greenhouse gases dynamics
… the distribution of CH4 emissions and sinks from wetlands (including freshwater and coastal wetlands) and non-wetland (including wet and dry soils) with a newly-developed vertically-resolved soil CH4 model, integrated into ISAM. I calibrated and tested this integrated model with CH4 observations …
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The contribution of manganese oxides to redox buffering in selected soils of the South African Highveld
The definition of a wetland places great importance on inundation and saturated soil conditions. The use of redoximorphic features as a soil wetness indicator is widely practiced. The reduction of Fe3+ to Fe2+, resulting in the formation of these features, is particularly diagnostic for wetland …
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The effects of hydrology and vegetation on microbial community structure and soil function in the sediments of freshwater wetlands
In wetland soils, hydrology is considered to be one of the primary factors shaping wetland function and microbial community structure, but plant-soil interactions are also important mechanisms affecting microbial nutrient transformations. The research presented here considered the interactive …
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Influence of natural organic matter on the mobility of arsenic in aquatic systems, soils and sediments
… studied As behaviour in columns experiments and wetland soils rich in organic matter. Arsenic mobility strongly depends on its redox state. Dissolved organic matter was previously found to be redox active but its redox properties are only poorly understood. In laboratory experiments we therefore …
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