桑树对矿区土壤中重金属的原位去除效应研究
Chinese Agricultural Science Bulletin(2012)
Abstract
为了研究矿区栽培种桑树对4种金属的富集特征和能力,在湖南浏阳七宝山矿区污染土壤上,以‘湖桑一号’为研究材料,分别测定植物各部分和土壤中Cu、Pb、Cd、Zn4种重金属含量。结果表明:桑树各部位单位重量中Cu的含量的趋势为根(33.13mg/kg)>叶(13.38mg/kg)>皮(7.51mg/kg)>骨(4.93mg/kg),Pb的含量的趋势为根(33.13mg/kg)>叶(10.32mg/kg)>皮(3.35mg/kg)>骨(1.73mg/kg),Cd的含量的趋势为根(4.53mg/kg)>叶(1.90mg/kg)>皮(1.57mg/kg)>骨(1.03mg/kg),Zn的含量的趋势为根(317.72mg/kg)>叶(186.53mg/kg)>皮(105.07mg/kg)>骨(89.16mg/kg)。每平方米耕作层土壤上桑树对Cu的迁移总量为12116.1mg,修复年限为2.01年,对Pb的迁移总量为7409.83mg,修复年限为15.45年,对Cd的迁移总量为2056.4mg,修复年限为1.26年,对Zn的迁移总量为254532.8mg,修复年限为0.39年。
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Key words
heavy metal,pollution soil,home position elimination effect,mining area,mulberry
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