The response of soil arylsulfatase enzymes to natural and artificial substrates was evaluated. An immobilized arylsulfatase reactor was used to hydrolyse ester sulfate compounds in two soils with different morphological properties and management schemes. Hydrolysable ester sulfates cleaved by the immobilized arylsulfatase reactor constituted 35 to 55% of the HI-reducible S in these soils. Naturally occurring low molecular weight (LMW) ester sulfate compounds were found to accumulate in soil and persist during storage. These compounds were examined as the naturally occurring substrate for soil arylsulfatase enzymes. / Arylsulfatase activity was evaluated using artificial (p-nitrophenol sulfate) and natural (LMW ester sulfates) substrates. The response of arylsulfatase activity in soil and humic-arylsulfatase complexes to p-nitrophenol sulfate did not reflect the ability of these complexes to hydrolyse natural soil substrates. / A preliminary experiment was conducted to examine arylsulfatase activity and soil sulfur in relation to sulfur in plant tissue and grain from wheat. Tissue sulfur was more strongly associated with soil sulfur than wheat grain.

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Thesis (Ph.D.)--University of Missouri-Columbia, 2004. / (tm) after EM in title is for Trademark symbol. Typescript. Vita. Includes bibliographical references (leaves 120-142). Also available on the Internet.

Thesis (Ph.D.)--University of Missouri-Columbia, 2004. / (tm) after EM in title is for Trademark symbol. Typescript. Vita. Includes bibliographical references (leaves 120-142). Also available on the Internet.

Graduation date: 1997

Reclaimed roads on the Little Missouri National Grasslands of southwestern North Dakota have not returned to pre-disturbance conditions. Phospholipid fatty acid analysis was performed on soil samples collected from reclaimed roads and adjacent prairie to assess reclamation effects on the microbial community. Additionally, nutrient cycling capacity was measured by four enzyme assays. Ordination analysis of PLFA data identified a distance gradient indicating microbial communities of reclaimed roads were different from the prairie. Specifically, Gram-negative bacteria and arbuscular mycorrhizal fungi are associated with roads; soil organic matter was associated with prairie sites. Soil enzyme activities associated with prairie sites indicate greater nutrient cycling. The soils of reclaimed roads have not accumulated sufficient organic matter to sustain both plant and microbial communities characteristic of the surrounding prairie.

Thesis (M.S.)--Oregon State University, 2008. / Printout. Includes bibliographical references (leaves 69-72). Also available on the World Wide Web.

Thesis (M.S. in Soil Science)--Washington State University. / Includes bibliographical references.

Thesis (Ph. D.)--Oregon State University, 2008. / Printout. Includes bibliographical references (leaves 125-136). Also available on the World Wide Web.

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