摘要
采用室外水稻盆栽试验,研究不同降雨量和植被覆盖与土壤重金属流失的规律。收集降雨后的流失水样和泥沙,分析Pb、Zn、Cd、As这4种重金属的流失总量。结果表明:随着降雨量的增加,流失的水样和泥沙中各重金属的总量都明显增加;而在同一降雨量下,随着植物覆盖程度的增加,流失泥沙逐渐减少,流失各重金属总量也随之减少;4种重金属在水稻环境下的水溶性大小为:Zn>Cd>As>Pb,并且流失泥沙中的重金属含量与本底值相近且明显高于流失水样中的重金属含量。
This paper emphasized on the rules of runoff loss of heavy metals in different rainfall and vegetation coverage,based on an outdoor pot experiment with rice.Collected the runoff loss of water and sediment samples after rainfall,analyzed the amount of heavy metals（Pb,Zn,Cd,As） loss.The results indicated that the amount of heavy metals loss significantly increased,with the increase of rainfall;in the same rainfall,with the increase of vegetation coverage,the sediment loss gradually reduced and the amount of heavy metals loss also reduced;the size of water solubility of heavy metals in rice soil： ZnCdAsPb;heavy metals content in sediment loss was significantly higher than that in water and closed to the background value.
出处
《水土保持学报》
CSCD
北大核心
2011年第1期39-42,46,共5页
Journal of Soil and Water Conservation
基金
国家科技重大专项"水体污染控制与治理"子课题"湘江流域重金属面源污染控制技术"(编号:2008ZX07212-01-05)
关键词
降雨
植被覆盖
重金属
流失
rainfall
vegetation coverage
heavy metals
runoff
