| Screening Effect of the Diffusive Boundary Layer in Sediments of Lake Aha in the Suburbs of Guiyang City,Guizhou Province |
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| 作者姓名： | 万国江 万曦 |
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| 作者单位： | StateKeyLab.ofEnvironmentalGeochemistry,InstituteofGeochemistry,ChineseAcademyofSciences,Guiyang,5500 |
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| 摘 要： | The redox cycle of iron and manganese is a major geochemica 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,Fe^2 and Mn^2 ,formed by diological oxidation,would diffuse up to overlying waters from sediments.However,the concentration of oxidation,would diffuse up to overlying waters from sediments,However,the concentration of Fe^2 increased later and decreased earlier than that of Mn^2 .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 Fe^2 ,The Fe concentration of anoxic water is quickly decreased from high to low as a result of reduction of the suplhur system.
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| 关 键 词： | 铁 锰 贵州 贵阳市 氧化还原作用 沉积物 地球化学 边界层 |
Screening effect of the diffusive boundary layer in sediments of Lake Aha in the suburbs of Guiyang city, Guizhou Province |
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| Guojiang Wan,Ronggui Huang,Yong Pu,Xi Wan.Screening Effect of the Diffusive Boundary Layer in Sediments of Lake Aha in the Suburbs of Guiyang City,Guizhou Province[J].Chinese Journal of Geochemistry,1997,16(4):347-352. |
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| Authors: | Guojiang Wan Ronggui Huang Yong Pu Xi Wan |
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| Institution: | (1) State Key Lab. of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang;(2) Institute of Soil and Fertilizer, Chinese Academy of Agricultural Sciences, 100081 Beijing |
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| 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.
The project was financially supported by the National Natural Science Foundation of China(49333040). |
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| Keywords: | Fe-Mn cycle diffusive boundary layer screening effect Lake Aha Guizhou |
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