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引用本文:万曦,万国江,黄荣贵,普勇.阿哈湖Fe、Mn沉积后再迁移的生物地球化学机理.湖泊科学,1997,9(2):129-134. DOI:10.18307/1997.0206
Wan Xi,Wan Guojiang,Huang Ronggui,Pu Yong.Biogeochemical Effect on Postdepositional Remobilization of Fe-Mn in Lake Aha, Guizhou Province. J. Lake Sci.1997,9(2):129-134. DOI:10.18307/1997.0206
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阿哈湖Fe、Mn沉积后再迁移的生物地球化学机理
万曦1, 万国江2, 黄荣贵2, 普勇2
1.中国农业科学院土壤肥料研究所, 北京 100081;2.中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550002
摘要:
贵州阿哈湖是一底层滞水带季节性缺氧的中型人工湖.由于长期积累.沉积物顶部微粒悬浮层出现了Fe、Mn富集.湖底缺氧时,经生物氧化作用形成的Fe2+、Mn2+自沉积物向上覆水体扩散,水体Fe2+浓度增高比Mn2+滞后出现且超过前结束.沉积物中硫酸盐还原作用一般在沉积物-水界面以下6cm深度内进行,但在缺氧季节上移至沉积物顶部,并抑制了Fe2+的释放.还原态Mn2+的氧化作用需分子氧参与.缺氧导致Mn的扩散迁移.基于天然水体中存在聚集Mn的生物效应,可寻求一条通过Mn细菌凝聚作用来控制Mn二次释放的途径.
关键词:  Fe-Mn沉积后迁移  生物地球化学  贵州阿哈湖
DOI:10.18307/1997.0206
分类号:
基金项目:国家自然科学基金49333040;49503049
Biogeochemical Effect on Postdepositional Remobilization of Fe-Mn in Lake Aha, Guizhou Province
Wan Xi1, Wan Guojiang2, Huang Ronggui2, Pu Yong2
1.institute of Soil and Fertilizer, Chiese Academy of Agricultural Sciences, Beijing 100081;2.State Key Lab.of Environmental Geochemistry, institute of Geochemistry, CAS, Guiyang 550002
Abstract:
Lake Aha, located in the suburb of Guiyang? Guizhou Province, is a medium artificial reservoir with seasonally anoxic hypolimina. After a long-term accumulation, iron and manganese are enriched in the upper sediments. When waters of oplimnion and hypolimnion are anoxic in late summer and early autumn, Fe2+and Mn2+ formed by biological respiration, are diffused upto the overlying waters from the sediments. However, the concentration of Fez+increases later and se-creases earlier than that of Mn2+. Generally, sulphate reduction takes place within 6cm depth of the sediments. Whereas in the anoxic season, the reduction reaches the upper sediment, inhibiting the diffusion of Fe2+. Meanwhile? manganese oxidation needing molecular oxygen as catalyst, causes the violent diffusion of Mn2+. Because manganese can be accumulated by microorganism in natural fresh water, it is important to seek method to control manganese remobilization through manganese accumulated action.
Key words:  Postdepositional remobilizaton of Fe-Mn  biogeochemical effect  Lake Aha
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