Model for the distribution of sulfate reduction and methanogenesis in freshwater sediments

Details Model for the distribution of sulfate reduction and methanogenesis in freshwater sediments Model for the distribution of sulfate reduction and methanogenesis in freshwater sediments

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50...11l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 1, pp.11-18

Mathematics

Logic

9

Scientific paper

A model, based on the in situ physiological characteristics of methanogens and sulfate reducers, was developed to describe the distribution of methanogenesis and sulfate reduction in freshwater sediments. The model predicted the relative importance of methane production and sulfate reduction in lakes of various trophic status and generated profiles of sulfate, acetate, methanogenesis, and sulfate reduction comparable to the profiles that are expected based on field studies. The model indicated that at sulfate concentrations greater than 30 M a sulfate-reducing zone develops because sulfate reducers maintain acetate concentrations too low for methanogens to grow. At lower sulfate concentrations a methanogenic zone develops because the dual limitations of low sulfate concentrations and acetate consumption by methanogens prevents sulfate reducers from growing. The model and a compilation of previously published field data indicate that, within the reported range of sulfate concentrations, the relative importance of methanogenesis and sulfate reduction in freshwater sediments is primarily dependent upon the rates of organic matter decomposition.

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