湖泊沉积物—水界面的HCO^—3地球化学研究

The study on HCO_3￣- geochemistry at sediment-water interface of lakes

为了解沉积物－水界面作为水体ＨＣＯ＾－３的源还是汇，选择云南洱海和泸沽湖两个湖泊，通过界面精细剖面和平衡计算，揭示了ＨＣＯ＾－在界面的地球化学行为。结果表明，界面作为ＨＣＯ＾－３的源，并非汇，通过沉积物和水相作用可以影响上覆水体的酸碱平衡关系。

In order to understand sediment-water interaction as source or sink of HCO_3￣-,through studying detail profiles of HCO_3￣-and balance budget,the paper chose lake Lugu and Erhai are chosed to describe HCO_3￣- geochemical behavior at the sediment-water interface.The results showed that the interface is the source of HCO_3￣- of the overlying water mass, not the sink,and that it Can affact acid-alkaline balance of the overlying water mass by means of diffusion.