再生水灌溉下重金属在植物-土壤-地下水系统迁移的研究进展

The Impact of Renewable Wastewater on the Distribution of Heavy Metals in Plants,Soil and Underground Water

再生水灌溉作为解决水资源紧缺的重要途径之一日益受到人们的重视。然而其水源中含有的重金属可能会对生态环境造成影响。回顾了国内外再生水灌溉下重金属在植物-土壤-地下水系统中的运移、分布、积累规律的研究现状与问题,在归纳分析的基础上提出了今后的研究方向。短期再生水灌溉一般不会增加植物体内重金属含量,再生水灌溉显著增加植物生物量对重金属所形成的"稀释效应"可能是其原因之一;不同的植物品种对不同重金属在植物、土壤中运移、分布和积累的影响有很大的差异;再生水短期灌溉往往不会降低土壤的环境质量,但长期灌溉再生水有可能会使土壤质量恶化,造成地下水重金属污染。

Using renewable wastewater for crop irrigation is an important way to solve the problem of water shortage,but the heavy metals in renewable wastewater will affect ecological environment.On the basis of reviewing and summarizing the state of heavy metal migration,distribution,accumulation in plants,soil and underground water with renewable wastewater irrigation,some further study of this field is stressed.This paper suggests that：in general,short-term renewable wastewater irrigation doesn’t increase the heavy metal concentrations in plants as irrigation increases plant biomass significantly.Different plant varieties show that great difference in heavy metal migration,distribution,accumulation in plant and soil.Renewable wastewaters with heavy metal contents can be used for irrigation on a short-term basis without sign cant degradation of soil and produces.It also shows that long-term renewable wastewater irrigation may eventually lead to deterioration of soil and water pollution.