苎麻对矿区土壤中重金属的原位去除效应

目的]对苎麻对矿区土壤中重金属的原位去除效应进行研究。方法]以"湘苎三号"、"中苎一号"2个苎麻品种为材料,研究在湖南浏阳七宝山矿区土壤中生长的植株重金属含量以及2个苎麻品种对Cu、Pb、Cd、Zn 4种重金属的富集和转移特征。结果]中一苎麻各部位单位重量中Cu的含量趋势为:根>皮>叶>骨;Pb含量的总体趋势为:根>叶>皮>骨,Cd的含量的总体趋势为:根>皮>骨>叶;Zn含量的总体趋势为:根>叶>皮>骨。重金属含量较低的A田每平方米耕作层土壤上种植的中一对Cu的迁移总量为3 404.44 mg,将土壤修复到国家标准土壤环境质量三级标准水平年限为8.59年;对Pb的迁移总量为3 638.5 mg,修复年限为13.52年;对Cd的迁移总量为720.48 mg,修复年限为1.49年;对Zn的迁移总量为37 324.8 mg,修复年限为0.67年。结论]在污染矿区种植中苎一号可较快修复矿区受Cu、Pb、Cd、Zn污染的土壤。

In-situ Elimination Effect on Heavy Metals in Soil of Orefield by Ramie

Objective] The aim was to study on in-situ elimination effect on heavy metals in soil of orefield by ramie(Boehmeria nivea(L.) Gaud.).Methods] Based on Xiangzhu No.3 and Zhongzhu No.1,we conducted research on heavy metal contents of plants growing in soil of Qibao Mountain orefield in Liuyang,Hunan Province,and on characteristics of enrichment and transfer of heavy metals(Cu,Pb,Cd,Zn) under influence of the two ramie species.Result] It was concluded that trend of Cu content in different parts of ramie was as follows: root>skin>leaf>bone;trend of Pb was bone>leaf>skin>bone;trend of Cd was root>skin>bone>leaf;the trend of Zn was root>leaf>skin>bone.In farmland A(with low content of heavy metal),for per square meter of plough horizon,effect of Zhong 1 on heavy metals transferring volume and the period for restoration of the soil into national standard one(Category Ⅲ of Environmental Quality Standard for Soil) have been concluded.Specifically,for Cu,the corresponding values were 3 404.44 mg and 8.59 y,respectively;for Pb,the values were 3 638.5 mg and 13.52 y;for Cd,the values were 720.48 mg and 1.49 y;for Zn,the values were 37 324.8 mg and 0.67 y.Conclusion] Soil contaminated by Cu,Pb,Cd,and Zn in orefield can be rapidly restored by growing ramie.