三峡库区消落带淹水后土壤性质变化的动态模拟

目的]为三峡库区消落带生态环境的有效保护提供参考。方法]以三峡库区消落带土壤-水体系统为研究对象,采用模拟试验装置研究消落带土壤淹水后土壤-水体系统中重金属的迁移行为及土壤pH值等理化性质的变化情况。结果]三峡水库蓄水时,江水浸泡对消落区土壤环境具有较大影响,各层（0～10、10～20、20～30cm）土壤中重金属含量及土壤pH值呈现出基本相同的变化趋势。淹水后,各层土壤的pH值均有一定程度的下降,土壤中重金属Zn、Cd、Zn、Cr和Cd均不同程度的溶出而进入江水。结论]三峡库区消落带土壤淹水后,土壤与水体之间发生了一系列复杂的交互作用。

Dynamic Simulation of Change in Soil Property of Flooded-belt in Three Gorges Reservoir Area after Flooding

Objective] The research aimed to provide references for effectively protecting the ecological environment of flooded-belt in three gorges reservoir area.Method] With soil-water body system of flooded-belt in three gorges reservoir area as researched object,the changes of physic and chemical properties including soil pH value and the migratory behavior of heavy metals in soil-water body system of flooded-belt after flooding were researched by using simulation experiment facility.Result] When the three gorges reservoir was storing water,soaking of river water had greater influence on soil environment of flooded-belt and the change trends shown in heavy metal content and pH value in various soil layers(0-10,10-20 and 20-30 cm)were basically same.After flooding,the pH values in various soil layers got some decrement and the heavy metals Zn,Cd,Zn,Cr and Cd in soil were dissolved in different degrees and transferred into river water.Conclusion] After flooding,there was a series of complex interaction occurred between soil and water body of flooded-belt in three gorges reservoir area.