Seasonal Change of Iron and Manganese in Lake Fukami-ike
Seasonal Change of Iron and Manganese in Lake Fukami-ike
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深见池铁、锰的季节变化
DOI：
10.3739/rikusui.47.279
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
Isami Shimodaira
中科院分区：
文献类型：
--
作者：
A. Yagi;Isami Shimodaira
本研究旨在详细阐明季节性缺氧湖泊中锰和铁的动态变化。富上样湖分层发生在3 ~ 10月，4 ~ 5 m以下以缺氧为主。6 ~ 10月在富氧层和贫氧层的交界处出现浑浊层。其厚度为0.5 ~ 1.8 m。这一层是由锰颗粒组成的。10月底，浑浊层随着环流的进展逐渐扩散，最终消失。水柱中颗粒锰浓度最大值出现层的溶解氧浓度始终在0.5 mg·1-1左右。1979年8月27日，在4.0 m深度发现了最高浓度的颗粒锰（0.55 mg·1-1）。从3月底开始，观察了底泥中锰离子（Mn2+）的释放情况。边界层（4.0 ~ 4.5 m）锰离子和低磷离子的最大浓度分别达到0.1和1.5 mg·1-1。根据沉积物中锰的释放与氧化锰的溶解或沉积之间的平衡来确定溶解锰和颗粒锰的剖面。在氧浓度约为0.5 mg·1-1的温跃层中产生并维持颗粒态锰。溶解铁的浓度似乎是由异源铁的供给、低铁离子中颗粒铁的沉积或溶解以及底部的FeS固定三者之间的平衡所控制的。
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.