Screening effect of the diffusive boundary layer in sediments of lake aha in the suburbs of Guiyang city, Guizhou province

摘要

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 hy- polimnion. Long-term sedimentary accumulation of iron and manganese resulted in their en- richment in the upper sediments. In the anoxic season, Fe~2+ and Mn~2+, formed by biological oxidation, would diffuse up to overlying waters from sediments.