Seasonal distribution of sulfur fractions in Louisiana salt marsh soils |
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Authors: | Nawarat Krairapanond Ronald D DeLaune William H Patrick |
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Institution: | 1. Laboratory for Wetland Soils and Sediments Center for Wetland Resources, Louisiana State University, 70803-7511, Baton Rouge, Louisiana
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Abstract: | The profile distributions of specific sulfur forms were examined at a site in a Louisiana salt marsh over a 1-yr period. Soil samples were fractionated into acid-volatile sulfides, HCl-soluble sulfur, elemental sulfur, pyrite sulfur, ester-sulfate sulfur, carbon-bonded sulfur, and total sulfur. Inorganic sulfur constituted 16% to 36% of total sulfur, with pyrite sulfur representing <2%. Pyrite sulfur content in marsh soil was relatively high in winter. Pyrite sulfur and elemental sulfur together accounted for 4% to 24% of the inorganic sulfur fraction. Between 74% and 95% of inorganic sulfur was present as the HCl-soluble sulfur form. A significant negative correlation between acid-volatile sulfides and elemental sulfur observed in summer suggested the transformation of fulfides to elemental sulfur. Organic sulfur, in the forms of ester-sulfate sulfur and carbon-bonded sulfur, predominated in all sampling periods, comprising 64% to 84% of total sulfur. The conversion of ester-sulfate sulfur into carbon-bonded sulfur was more likely to occur in winter than in other seasons. Carbon-bonded sulfur accounted for 53% to 89% of the organic sulfur. Organic sulfur was the major contributor to the variation of total sulfur in all seasons studied. Total sulfur concentration showed a statistically significant increase with depth. |
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