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 11 of 11 for “"O horizon"”.
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Long-term Effects of Prescribed Fire and Fire Surrogate Treatments on Southern Appalachian Mountain Forest Soil Chemistry
… to determine potential treatment impacts for: O horizon and mineral soil (0-10 cm depth) carbon (C), nitrogen (N), carbon:nitrogen (C:N) and mineral soil calcium (Ca), magnesium (Mg), phosphorus (P), potassium (K), and pH. Results suggested slight, but statistically significant changes in O …
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Impacts of Fertilization on Soil Properties in Loblolly Pine Plantations in the Southeastern United States
… phosphorus (P) fertilizer applications on the O horizon and mineral soil in loblolly pine (Pinus taeda L.) plantations over a 12-year period. To accomplish this, we used 9 experimental sites located across the south, which were grouped using the CRIFF Classification System. Group 1—CRIFF A, B …
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Catchment Structure Regulates Hydrodynamic Drivers of Chemical Weathering in Shallow Forest Soils
… in the upper reaches of the catchment, where O horizon saturation frequency and DOC concentrations are highest. Annual base cation fluxes, which were also greatest in these positions, could indicate where weathering is likely still enhanced. Additionally, while O horizon saturation occurred …
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Evaluating dNBR and CBI for Fire Severity Estimation in Fennoscandian Boreal Surface Fires
… field measurements—tree mortality, O-horizon (including litter and humus layers) thickness loss, and mass loss. This enables direct evaluation of how accurately dNBR reflects fire effects on both canopy and soil strata. Additionally, I also evaluate the level of alignment between dNBR …
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Detecting Change in Belowground Carbon Stocks: Statistical Feasibility and Future Opportunities from Loblolly Pine Forests
… C subpools (i.e., coarse woody material, O horizon, mineral soil, detritus, fine roots) in planted loblolly pine stands by compiling statistical distributions from existing databases. We performed power analyses to quantify minimum detectable change in each subpool given current sample …
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Integrating basic remote sensing, terrain analysis and geostatistical methods to generate spatially explicate continuous soil attribute maps for Fraser Experimental Forest
… of soil properties (Total soil depth, A-horizon and O-horizon thickness) at a fine scale (0.001 ha). These spatial models can be used as inputs to hydrological and ecological models to further evaluate the soil's influence on water chemistry and vegetation distributions, and to provide an …
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Building a better burn: Fuel characterization and fire effects in silvicultural systems in the southern United States
… elevated relative abundance of carbon in the O horizon and mineral soil. For forest managers, fuel loading estimates are useful for predicting fire behavior and effects, such as smoke emissions and fuel consumption, which can help determine optimal timing and locations for prescribed fire. …
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The Lasting Effects of Prescribed Fire and Harvesting on Forest Floor and Soil Nutrients in the Eastern Sierra Nevada Mountains
… were showing signs of decomposition in that O horizon mass had decreased and C: N ratios had declined in mineral soil in the thinned, unburned plots. This site also experienced an influx of post-fire nitrogen fixing vegetation; most abundant is Ceanonthus velutinus Dougl. The data showed a …
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The Effects of Prescribed Burning on Soil Water Infiltration Rates and Other Select Soil Physical and Chemical Properties in East Texas
… particle density, pore space, soil strength, O-horizon weight and depth (organic matter), water stable aggregates, and soil fertility. This project was conducted on two different burn intervals. The National Forests and Grasslands of Texas (NFGT) of the United States Forest Service burns, …
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Carbon and Nitrogen Dynamics of a Lagoon Salt Marsh in Davenport, California
… to note that our study did not include the O horizon of the soils and the soils are not saturated year-round. There is a clear need for further study of the dynamics of <em>Typha</em> invasion and its effects on salt marsh C and N dynamics.</p> <p>Hydrology, which controls oxidized versus …
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Gross N turnover and soil solution chemistry as influenced by fluctuations of soil water potential and water table in a Podzol and a fen soil
… Homogenized soil samples of the Oi+Oe, Oa and EA horizons were taken and adjusted to 6 different water potentials in the laboratory. In the field experiment, throughfall exclusion and irrigation plots were established to simulate different precipitation patterns of a dry and wet growing season. …