Abstract
The redox cycle of iron and manganese is a major geochemical process at the boundary layers of lake sediments. Lake Aha, which lies in the suburbs of Guiyang City, Guizhou Province, China, is a medium-sized artificial reservoir with seasonally anoxic hypolimnion. Long-term sedimentary accumulation of iron and manganese resulted in their enrichment in the upper sediments. In the anoxic season, Fe2+ and Mn2+, formed by biological oxidation, would diffuse up to overlying waters from sediments. However, the concentration of Fe2+ increased later and decreased earlier than that of Mn2+. Generally, sulfate reduction occurred at 6 cm below the sediment-water interface. Whereas, in the anoxic season, the reduction reached upper sediments, inhibiting the release of Fe2+. The Fe concentration of anoxic water is quickly decreased from high to low as a result of reduction of the sulphur system.
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The project was financially supported by the National Natural Science Foundation of China(49333040).
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Wan, G., Huang, R., Pu, Y. et al. Screening effect of the diffusive boundary layer in sediments of Lake Aha in the suburbs of Guiyang city, Guizhou Province. Chin. J. Geochem. 16, 347–352 (1997). https://doi.org/10.1007/BF02870919
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DOI: https://doi.org/10.1007/BF02870919