锡矿区周边玉米植株中重金属分布特征与污染状况

目的]研究云南某锡矿区周边玉米植株中重金属分布特征与污染情况。方法]对云南某锡铅矿区周边污染土壤上种植的玉米植株中重金属含量进行分析。结果]矿区周围不同区域玉米地土壤重金属污染程度不同，各种重金属污染程度为Cd〉Cu〉Pb〉Zn〉Cr，Cd属于重度污染，Cr在各采样点均未受污染。重金属污染程度不同区域采集玉米植株重金属含量差异较大，具体表现为Pb〉Cd〉Cr〉Zn〉Cu，其中除cu大部分样品污染较轻外，Pb、Cd、Cr和Zn均为重度污染。重金属在玉米植株各器官中的分布特征为：叶〉茎〉果实，玉米各器官中重金属富集系数总体上也表现为：叶〉茎〉果实。结论]锡矿区周边土壤及玉米植株均受到重金属污染，表现出一定的生态风险。

Research on the Character of Distribution of the Pollution of Heavy Metal in the Maize around the Stannary in Yunnan

Objective ] The aim of the study was to research the character of distribution of the pollution of heavy metal in the maize around the stannary in Yunnan. Method]The concentration of heavy metal in maize around the stannary in Yunnan was analyzed. Result] The level of heavy metal pollution in soil which was used to plant maize was vary from sector. The extent of pollution among the hevay metal from top to bottom was Cd,Cu,Pb,Zn and Cr,respectively. The pollution of Cd was much more serious,but not detected for Cr. The concentration of hevay metal in maize was vary from district which has been polluted by hevay metal,and the concentration from top to the bottom was Pb,Cd,Cr,Zn and Cu,re- spectively. All the maize were polluted by these heavy metal except for Cu. The concentration of these heavy metal was vary from the organ of the maize, the distribution character of heavy metal was most in the leave, and more in the stem and least in the fruit. The coefficient of enrichment of maize among different organ was the same to above. Conclusion ] The maize which grew around the stannary were polluted by heavy metal ,thus, there was ecological crisis to some extent in this region.