BIOGEOCHEMICAL MECHANISM OF POSTDEPOSITIONAL MIGRATION OF Fe AND Mn IN LAKE AHA, CHINA
- Received Date: 1997-03-10
- Publish Date: 1997-12-20
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Key words:
- postdepositional migration of Fe and Mn /
- biogeochemical effect /
- Lake Aha
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 bioledcal oxidation, would diffuse upto upper water from sediments. However, the concentration of Fe2+ incrlater and decreased earlier than that of Mn2+. Generally, Sulfate reduction occUrred at 6cm 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.Keywrods: petdeopitional migration of Fe and Mn, biogaxhemical effect, Lake Aha
Citation: | Wan Xi, Wan Guojiang, Huang Ronggui, Pu Yong. BIOGEOCHEMICAL MECHANISM OF POSTDEPOSITIONAL MIGRATION OF Fe AND Mn IN LAKE AHA, CHINA[J]. Chinese Geographical Science, 1997, 7(4): 368-374. |