%0 Journal Article
%T 阿哈湖Fe、Mn沉积后再迁移的生物地球化学机理
%T Biogeochemical Effect on Postdepositional Remobilization of Fe-Mn in Lake Aha, Guizhou Province
%A 万曦
%A 万国江
%A 黄荣贵
%A 普勇
%A Wan Xi
%A Wan Guojiang
%A Huang Ronggui
%A Pu Yong
%J 湖泊科学
%J Journal of Lake Sciences
%@ 1003-5427
%V 9
%N 2
%D 1997
%P 129-134
%K Fe-Mn沉积后迁移;生物地球化学;贵州阿哈湖
%K Postdepositional remobilizaton of Fe-Mn;biogeochemical effect;Lake Aha
%X 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.
%X 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.
%R 10.18307/1997.0206
%U http://www.jlakes.org/ch/reader/view_abstract.aspx
%1 JIS Version 3.0.0