Abstract
Lake Aha in Guizhou Province, China is a medium-sized artificial reservoir with seasonally anoxic hypolimnion. Long-term sedimentary accumulation of iron and manganese resulted in their enrichment in the upper sediments. In anoxic season, Fe2+ and Mn2+ formed from biological oxidation, would diffuse upto upper water from sediments. However, the concentration of Fe2+ increased later and decreased earlier than that of Mn2+. Generally, sulfate reduction occurred at 6 cm below the sediment-water interface. Whereas, in anoxic season, the reduction reached sediment top, inhibiting the release of Fe2+. As the oxidation of Mn2+ required molecular oxygen as catalyst, serious anoxia caused the violent diffusion of Mn2+. Based on the bio-effects on the accumulation of Mn in natural fresh water, it’s necessary to seek a way to control manganese rerelease through accumulated manganese bacteria action.
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