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Chinese Journal of Geochemistry

, Volume 16, Issue 4, pp 347–352 | Cite as

Screening effect of the diffusive boundary layer in sediments of Lake Aha in the suburbs of Guiyang city, Guizhou Province

  • Wan Guojiang 
  • Huang Ronggui 
  • Pu Yong 
  • Wan Xi 
Article

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.

Key words

Fe-Mn cycle diffusive boundary layer screening effect Lake Aha Guizhou 

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Copyright information

© Institute of Geochemistry, Chinese Academy of Sciences 1997

Authors and Affiliations

  • Wan Guojiang 
    • 1
  • Huang Ronggui 
    • 1
  • Pu Yong 
    • 1
  • Wan Xi 
    • 2
  1. 1.State Key Lab. of Environmental Geochemistry, Institute of GeochemistryChinese Academy of SciencesGuiyang
  2. 2.Institute of Soil and FertilizerChinese Academy of Agricultural SciencesBeijing

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