有色冶炼污染区土壤污染及重金属超积累植物的研究

对某省两个有色冶炼污染区进行了土壤和植物采样，并对6个样点土壤和11种植物中的As、Pb、Cd、Zn等重金属含量做了测定分析。结果表明：①该区域土壤已经受到不同程度的重金属污染。其中以As和Cd污染最为严重;②从植物地上部重金属富集系数和体内含量来看．钻形紫苑具备了As-Pb-Cd超积累植物的基本特征。进一步研究的价值很大，白苞蒿地上部As、Pb、Cd及小白酒草地上部Cd富集系数均大于1．也具备了超积累植物的基本特征；③大部分植物富集As、Pb、Cd、Zn均呈现地上部高于地下部的富集规律，是通过根系吸收转移还是叶片吸收还有待实验室内人工栽培确定。

Soil Pollution and Heavy Metals Hyperaccumulators around Two Sites Contaminated by Smelting

In this paper,soils and native plants around two sites contaminated by smelting were investigated.The contents of heavy metals(As,Pb,Cd and Zn) in 6 soil samples and 11 plant samples were measured.The results indicate:(1)the soils were severely contaminated with four heavy metals,especially As and Cd;(2) according to the bioaccumulation factors and contents in the above-ground of plants,Aster subulatus Michx showed hyperaccumulative characteristics for As,Pb and Cd.The bioaccumulation factors in the above-ground of Artemisia lactiflora wall for As-Pb-Cd and Conyza Canadensia(L.) cronq for Cd were>1 respectively and possessed basic characteristics of hyperaccumulators,too;(3) most plants showed the higher contents of four heavy metals in the above-ground than in the below-ground,due to root absorption and transfer or leafage absorption,which needs to be determined by manual cultivation in laboratory.