Abstract
对鄱阳湖地区蚌湖水下沉积物、滩地草甸土柱状样品不同深度土壤的酸度、氧化还原电位进行了现场测定;对剖面各层次的Fe、Mn总量,还原性Fe、Mn含量,以及有机质等进行了分析。实验表明:鄱阳湖湿地土壤中Fe、Mn有其独特的分布规律和迁移特征。元素Fe仅在水土界面轻微富集,Mn则向界面和深层双向富集;还原性Fe、Mn受氧化还原边界层的控制呈垂向分布。另外,元素Fe、Mn的水平迁移与水位变动相关,退水时Fe、Mn具有向湖中心迁移的特征。;Poyang Lake, a special freshwater lake, is an inflow-outflow lake with falling water level.and rich aquatic creature resources.The migratory behavior of Poyang Lake wetland soil elements is more remarkable than that of ordinary soil because of its periodic variation of water level.The typical elements, Fe and Mn, which are sensitive to oxidation-deduction control the geochemical circulation of some other trace elements.In this paper, the acidity (pH) and redox potential(Eh) of the wetland soil cores of Poyang Lake at different depths are observed in the spot.The distribution of the total content of elements, Fe and Mn, reduced Fe and Mn, organic matter etc.at different depths on the section is also studied.The results show that Fe and Mn are of special distribution pattern and migratory characteristics.Fe was only accumulated lightly on the water-land boundary layer, but Mn not only on the boundary layer, but also in deep layers.The distribution and migratory characteristics of reduced Fe and Mn which are controlled by the redox boundary layer occured in the vertical direction.Fe and Mn migrated in the horizontal direction was also found which was related to the change of water level.When tide is on the ebb, Fe and Mn migrate to the lake centre.Results in Dacha Lake, Sha Lake etc.around the Wucheng County showed the same conclusion.Finally we discussed the influence on the environment of Poyang Lake aera owing to the variation of water level caused by the Three-Gorge Project.After the building of the Three -Gorge Project, because discharge amount of the Yangtze River decreases in October caused by storing floodwater, Poyang Lake water level will descend significantly, and wetland of Poyang Lake will emerge earlier, resulting in, the change of soil characteristics.
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