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The mechanisms underlying the resistance and resilience of soil carbon and nitrogen cycling to environmental stressesShu, Xin January 2018 (has links)
Cycling of nutrients, such as Carbon (C) and Nitrogen (N), is one of the most important soil functions and is strongly related to the composition of the soil microbial community. However, soil is increasingly under environmental pressures that threaten its ecological functions and sustainability. To maintain soil functional sustainability, it is important to understand how soil withstands environmental stresses (subsequently referred to as resistance) and recovers from stresses (subsequently referred to as resilience). This study focused on the resistance and resilience of C and N processes and the underpinning microbial communities to a persistent Cu stress or a transient heat stress. The main advances and novel findings of this thesis are: (1) C mineralization is more resistant and resilient than ammonia oxidation and denitrification, and thus the combination of C and N processes are more informative than measuring a single process to interpret the overall resistance and resilience; (2) microbial composition and microbial physiological evolution play important roles in affecting resistance and resilience; (3) soil physico-chemical properties (e.g. organic matter, soil water and soil pH) are critically important in conferring resistance and resilience. The outcome of this study advances the understanding of the mechanisms of soil resistance and resilience of C and N cycling to environmental changes. The results generated here are an essential step for improving soil sustainability and promoting agricultural productivity under future environmental challenges.
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Ecological aspects of viruses in soilsWilliamson, Kurt Elliott. January 2007 (has links)
Thesis (Ph.D.)--University of Delaware, 2006. / Principal faculty advisors: Karl E. Wommack, Dept. of Plant & Soil Sciences, University of Delaware; Mark Radosevich, Dept. of Biosystems Engineering and Soil Science, University of Tennessee. Includes bibliographical references.
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The effects of compaction on hydrologic properties of forest soils in the Sierra Nevada /Cafferata, Peter Herman Louis. January 1980 (has links)
Thesis (M.S.)--Oregon State University, 1981. / Typescript (photocopy). Includes bibliographical references (leaves 125-132). Also available on the World Wide Web.
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Chronological variation in soil density and vegetative cover of compacated skid trails in clearcuts of the western Oregon Cascades /Vanderheyden, Jon. January 1980 (has links)
Thesis (M.S.)--Oregon State University, 1981. / Typescript (photocopy). Includes bibliographical references (leaves 105-113). Also available on the World Wide Web.
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Determination of soil properties from earthquake dataHuerta López, Carlos Isidro. January 2002 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.
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Numerical formulation for a dynamic analysis of the plastic behavior in saturated granular soilsSong, Chi-Yong, January 2003 (has links)
Thesis (Ph. D.)--Ohio State University, 2003. / Title from first page of PDF file. Document formatted into pages; contains xix, 246 p.; also includes graphics. Includes abstract and vita. Advisor: William E. Wolfe, Dept. of Civil Engineering. Includes bibliographical references (p. 137-142).
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Spatial variation of soil hydrologic parametersStockton, J. G. January 1971 (has links) (PDF)
Thesis (M.S. - Agricultural Chemistry and Soils)--University of Arizona, 1971. / Includes bibliographical references.
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Effect of sulfuric acid on water movement in calcareous soilsYahia, Taher Ahmed, January 1974 (has links) (PDF)
Thesis (M.S. - Soils, Water and Engineering)--University of Arizona. / Includes bibliographical references.
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Thermal gradients and water transfer in unsaturated soilTromble, John Merrill, January 1973 (has links) (PDF)
Thesis (Ph. D. - Watershed Management)--University of Arizona. / Includes bibliographical references.
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The effects of selected nitrogen and sulfur applications on soil pH, water soluble sulfate, DTPA extractable iron, manganese, copper and zinc on selected Arizona soilsDickey, Juliana Sloan. January 1985 (has links) (PDF)
Thesis (M.S. - Soils, Water and Engineering)--University of Arizona, 1985. / Includes bibliographical references (leaves 46-47).
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