Seasonal change of iron and manganese in lake Fukami-ike - Occurrence of turbid manganese layer.:-Occurrence of Turbid Manganese Layer-

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This study was undertaken to clarify in detail the dynamics of manganese and iron in a seasonally anoxic lake. Lake Fukami-ike stratified from March to October, and the anoxic condition prevailed below 4-5 m depth. The occurrence of a turbid layer was found in the boundary of the oxic and anoxic layers from June to October. Its thickness ranged from 0.5-1.8 m in depth. This layer was composed of particulate manganese. At the end of October, the turbid layer gradually spread with the progress of circulation and finally disappeared. The dissolved oxygen concentration at the layer where the maximum of particulate manganese concentration in the water column appeared, was always about 0.5 mg·1-1. The highest concentration of particulate manganese (0.55 mg·1-1), was found at 4.0 m depth on 27 August 1979. The release of manganous ion (Mn2+) from the bottom sediment was observed from the end of March. The maximum concentration of manganous ion in the boundary layer (4.0-4.5 m) and hypolimnion reached 0.1 and 1.5 mg·1-1, respectively. The profile of dissolved and particulate manganese would be determined according to the balance among the release from the sediment and the dissolution or deposition of oxidized manganese. The particulate manganese would be produced and maintained in the thermocline where the oxygen concentration is about 0.5 mg·1-1. The concentration of dissolved iron seemed to be controlled by the balance among the supply of allochthonous iron, the deposition or dissolution of particulate iron in the hypolimnion and the FeS fixation at the bottom.
日本陸水学会の論文

Seasonal change of iron and manganese in lake Fukami-ike - Occurrence of turbid manganese layer.:-Occurrence of Turbid Manganese Layer-

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日本陸水学会 | 論文

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