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Sulfur cycling in a forested Sphagnum bog in northern Minnesota

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Abstract

The mass balance and internal cycle of sulfur within a small forested,Sphagnum bog in northern Minnesota are presented here based on a 4-year record of hydrologic inputs and outputs (precipitation, throughfall, streamflow, upland runoff) and a 3-year measurement of plant growth and sulfur uptake. Concentrations and accumulation rates of inorganic and organic sulfur species were measured in porewater. The bog is a large sink for sulfur, retaining 37% of the total sulfur input. Because of the relatively large export of organic S (21% of inputs), retention efficiency for total-S (organic S + SO =4 ; 37%) is less than that for SO =4 (58%). There is a dynamic cycle of oxidation and reduction within the bog. Annual oxidation and recycling of S is equal to total inputs in the center of the bog. Plants receive 47% of their uptake requirement from atmospheric deposition, 5% from retranslocation from foliage, and the remainder from sulfur remineralized from peat. Mineralization is most intense in the aerobic zone above the water table. Inorganic sulfur species comprise <5% of the total sulfur burden within the peat.

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  1. Dept. of Civil & Mineral Engineering, University of Minnesota, Minneapolis, MN, 55455, USA

    N. R. Urban & S. J. Eisenreich

  2. Dept. of Soil Science, University of Minnesota, St. Paul, MN, 55108, USA

    D. F. Grigal

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  1. N. R. Urban
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  2. S. J. Eisenreich
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  3. D. F. Grigal
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Urban, N.R., Eisenreich, S.J. & Grigal, D.F. Sulfur cycling in a forested Sphagnum bog in northern Minnesota. Biogeochemistry 7, 81–109 (1989). https://doi.org/10.1007/BF00004123

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