不同品种印度芥菜对潮褐土Cd、Pb、Zn富集能力的比较研究

Study on sorption and accumulation for different kinds of Brassica juncea with Cd,Pb and Zn in the soil

通过添加外源Cd、Pb、Zn的模拟试验,研究了7个品种的印度芥菜对潮褐土中Cd、Pb、Zn富集能力的差异。结果表明:在土壤Cd、Pb、Zn复合污染条件下,7个品种地上部对Cd的富集量平均值在2.73～51.23 mg/kg之间,地下部对Cd的富集量平均值为在7.32～101.33 mg/kg之间,地上地下部Cd含量最大值均为品种Ⅵ,品种Ⅳ适合用于修复重度Cd污染,品种Ⅰ适合修复轻度Cd污染。地上部对Pb的富集量平均值在16.87～75.03 mg/kg之间,地下部对Pb的富集量平均值为在28.85～613.36 mg/kg之间,Pb含量最大值地上地下部均为品种Ⅱ,品种Ⅲ适合用于修复不同程度的Pb污染土壤。地上部对Zn的富集量平均值在153.53～7346.59mg/kg之间,地下部对Zn的富集量平均值为在348.91～954.29 mg/kg之间,Zn含量最大值地上地下部均为品种Ⅱ,品种Ⅲ适合用于修复重度Zn污染,品种Ⅱ适合修复轻度Zn污染。总体来讲,3种重金属转移活动能力大小为Zn>Cd>Pb,印度芥菜对不同重金属富集能力大小为:Cd>Zn>Pb。

The soil pot experiment about compound contamination with cadmium,zinc and lead was carried out with meadow cinnamon soil and different species of Brassica juncea.The results showed that the average amount of sorption for the seven species of Brassica juncea on the ground part Cd is 2.73～51.23 mg/kg,Pb is 16.87～75.03 mg/kg,Zn is 153.53～7 346.59 mg/kg.The underground part Cd is 7.32～101.33 mg/kg,Pb is 28.85～613.36 mg/kg,Zn is 348.91～954.29 mg/kg.The content of ground part for Cd is ⅦⅥⅡⅢⅣⅠⅤ,Pb is ⅡⅢⅠⅣⅥⅤⅦ,Zn is ⅥⅣⅦⅢⅡⅠⅤ.The content of underground part for Cd is ⅦⅥⅠⅣⅡⅤⅢ,Pb is ⅡⅦⅣⅠⅥⅢⅤ,Zn is ⅤⅦⅡⅠⅥⅣⅢ.The highest content of Cd is species Ⅵ and the highest content of Pb,Zn is species Ⅱ.In short,the ability of translocation is ZnCdPb,the ability of bioaccumulation is CdZnPb.There is no compound effect between the 3 heavy metals for the sorption of Brassica juncea.