云南洱海沉积物──水界面铁、锰的分布和迁移特征

Characteristics of Distribution and Removal of Fe and Mn at the Sediment-water Interface of Erhai Lake,Yunnan Province

洱海是一永久性含氧湖泊。对洱海沉积物中铁、锰的分布特征进行了分析，说明洱海沉积物中铁的循环比锰微弱的多，铁氧化物的还原作用受到了溶解氧和锰氧化物的双重控制。输入沉积物中的铁大部分都保存于沉积物中。锰氧化物的还原虽然也受到溶解氧的制约，但其还原作用仍很激烈，所以锰对环境的敏感程度比铁高，沉积物中的铁具有环境记录意义，而锰不具有环境记录意义。

Erhai is a permanent oxygen containing lake. At the sediment of Erhai Lake,Mn-cycle is more apparent than Fe-cycle. Fe-oxide reduction is controlled by DO and Mn-oxide. Although Mn-oxide reduction is controlled by DO, it's still severe,So Fe can record environmental changes.