Inorganic and Organic Sulfur Cycling in Salt-Marsh Pore Waters

Sulfur species in pore waters of the Great Marsh, Delaware, were analyzed seasonally by polarographic methods. The species determined (and their concentrations in micromoles per liter) included inorganic sulfides ($\leq $3360), polysulfides ($\leq $326), thiosulfate ($\leq $104), tetrathionate ($\le...

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Published in:Science (American Association for the Advancement of Science) 1986-05, Vol.232 (4751), p.746-749
Main Authors: Luther, George W., Church, Thomas M., Scudlark, Joseph R., Cosman, Monique
Format: Article
Language:English
Subjects:
Brackish
Chemistry
Marine biology
Marshes
Organic sulfur compounds
Oxidation
Polysulfides
Pyrites
Salt marsh ecology
Salt marshes
Sediments
Soils
Sulfides
Sulfur
Sulfur compounds
Thiols
Tidal marsh ecology
Tidal marshes
Water
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creator Luther, George W.
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description Sulfur species in pore waters of the Great Marsh, Delaware, were analyzed seasonally by polarographic methods. The species determined (and their concentrations in micromoles per liter) included inorganic sulfides ($\leq $3360), polysulfides ($\leq $326), thiosulfate ($\leq $104), tetrathionate ($\leq $302), organic thiols ($\leq $2411), and organic disulfides ($\leq $139). Anticipated were bisulfide increases with depth due to sulfate reduction and subsurface sulfate excesses and pH minima, the result of a seasonal redox cycle. Unanticipated was the pervasive presence of thiols (for example, glutathione), particularly during periods of biological production. Salt marshes appear to be unique among marine systems in producing high concentrations of thiols. Polysulfides, thiosulfate, and tetrathionate also exhibited seasonal subsurface maxima. These results suggest a dynamic seasonal cycling of sulfur in salt marshes involving abiological and biological reactions and dissolved and solid sulfur species. The chemosynthetic turnover of pyrite to organic sulfur is a likely pathway for this sulfur cycling. Thus, material, chemical, and energy cycles in wetlands appear to be optimally synergistic.
doi_str_mv 10.1126/science.232.4751.746
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The species determined (and their concentrations in micromoles per liter) included inorganic sulfides ($\leq $3360), polysulfides ($\leq $326), thiosulfate ($\leq $104), tetrathionate ($\leq $302), organic thiols ($\leq $2411), and organic disulfides ($\leq $139). Anticipated were bisulfide increases with depth due to sulfate reduction and subsurface sulfate excesses and pH minima, the result of a seasonal redox cycle. Unanticipated was the pervasive presence of thiols (for example, glutathione), particularly during periods of biological production. Salt marshes appear to be unique among marine systems in producing high concentrations of thiols. Polysulfides, thiosulfate, and tetrathionate also exhibited seasonal subsurface maxima. These results suggest a dynamic seasonal cycling of sulfur in salt marshes involving abiological and biological reactions and dissolved and solid sulfur species. 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The chemosynthetic turnover of pyrite to organic sulfur is a likely pathway for this sulfur cycling. 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The chemosynthetic turnover of pyrite to organic sulfur is a likely pathway for this sulfur cycling. Thus, material, chemical, and energy cycles in wetlands appear to be optimally synergistic.</abstract><cop>United States</cop><pub>The American Association for the Advancement of Science</pub><pmid>17769570</pmid><doi>10.1126/science.232.4751.746</doi><tpages>4</tpages></addata></record>
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identifier ISSN: 0036-8075
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subjects Brackish
Chemistry
Marine biology
Marshes
Organic sulfur compounds
Oxidation
Polysulfides
Pyrites
Salt marsh ecology
Salt marshes
Sediments
Soils
Sulfides
Sulfur
Sulfur compounds
Thiols
Tidal marsh ecology
Tidal marshes
Water
title Inorganic and Organic Sulfur Cycling in Salt-Marsh Pore Waters
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