典型铅锌矿区土壤-农作物体系重金属含量及污染特征分析

目的]研究贵州SQ、DX典型铅锌矿区种植的水稻、玉米与其土壤中重金属的污染状况，为矿区环境保护、农业生产提供参考。方法]以该矿区18个水稻籽、15个玉米样品与其土壤中重金属含量为对照，采用单项污染指数法和综合污染指数（内梅罗指数）法研究铅锌矿区土壤-农作物体系重金属含量间的相关性。结果]研究结果表明，水稻籽、玉米中Cu、As的单因子污染指数小于1，Pb、Cr、Hg、Cd的单因子污染指数大于2，已造成农作物污染。采用综合污染指数评价，该矿区种植的水稻籽、玉米已受重金属污染。结论]除Cu、As、Zn外，水稻籽、玉米中的其他重金属含量与土壤中的相应重金属含量显著相关，说明这些元素较易从土壤向水稻、玉米植物体内迁移积累。

Research on the Content of Heavy Metal in Crop Planting System in Typical Lead-zinc Soil and its Pollution Characteristics

Objective] The reference for the environmental protection and agricultural production in mining area was provided through the study on the rice and corn planted in the typical lead-zinc area of SQ and DX and the pollution of heavy metal in soil in Guizhou. Method] The samples of 18 rice seeds, 15 corns in the mining area and the content of heavy metal in soil being taken as experimental material and the control, respectively, the relevance among the heavy metals in the crop planting system--lead-zinc soil area with evaluation method of single pollution index and integrated pollution index(Nemero Index) was studied. Results] The results showed that the single-factor pollution index of Cu and As in rice seed and corn was less than 1; Pb, Cr, Hg and Cd, more than 2; which resulted in crop contamination. The rice seeds and corn planted in the mining area were affected by heavy metal contamination through the evaluation of integrated pollution index. Conclusion] In addition to Cu, As and Zn, there was significant relationship in the content of other heavy metals in between the rice seeds, corn and the soil, indicating these elements were more easily to be accumulated in the rice and corn plants from the soil.