Importance of organic and inorganic sulfur to mineralization processes in a forest soil |
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Authors: | M.B. David S.C. Schindler M.J. Mitchell J.E. Strick |
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Affiliation: | Department of Environmental and Forest Biology, State University of New York, College of Environmental Science and Forestry, Syracuse, NY 13210, U.S.A. |
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Abstract: | Sulfur mineralization rates, changes in organic and inorganic S constituents and arylsulfatase activity were determined in four soil horizons (O2, B21h, B22hir and B23) which represent the major portion of a forest Spodosol (Becket). Biweekly, for 20 weeks, soil subsamples were leached with deionized water and analyzed for S constituents. Rates of water-soluble sulfate release were 123, 39, 34 and 18 nmol S g?1 dry mass week?1 for O2, B22hir, B23 and B21h horizons, respectively. Only in the organic O2 horizon did non-sulfate inorganic S (Zn-HCl-S) increase (15 nmol S g?1) while phosphate extractable S decreased in all the mineral horizons (13, 19 and 28 nmol S g?1 week?1, B21h, B22hir and B23, respectively) due to desorption. Ester sulfate was mineralized in the B22hir and B23 horizons (?66 and ?22 nmol S g?1 week?1) and increased in the O2 (174 nmol S g?1 week?1). Arylsulfatase activity varied among horizons and decreased with time. Carbon-bonded S decreased in all horizons, especially those with high respiration rates (i.e. O2 and B21h), but changes were not significant. Only the B22hir horizon exhibited a significant loss of total S (128 nmol S g?1 week?1). The interrelationships among inorganic and organic S dynamics were outlined. |
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