三峡库区主要粮食作物和土壤中重金属的相关性及富积特征分析

采用野外采样和室内分析,试验结果表明三峡库区土壤中重金属Cu、Zn、Pb、Cd、Fe、Cr的变异系数小于50%,重金属的含量比较稳定。稻谷（Oryza sativa）中Cu、Zn、Pb、Cd、Fe、Mn、Cr,玉米（Zea mays）中Pb、Cd、Fe、Mn、Cr和小麦（Triticum aestivum）中Cu、Pb、Cd、Fe、Mn、Cr的变异系数大于50%。土壤、稻谷、玉米、小麦中大部分重金属呈偏态分布。土壤中重金属间均为正相关,且极显著正相关性明显。稻谷、玉米、小麦中重金属间有正相关,也有负相关,但正相关明显多于负相关;稻谷、玉米、小麦中Mn同其它重金属间均有显著正相关性,协同作用明显。稻谷、玉米、小麦中Pb、Cd、Cr的样本超标率较大,污染明显,并且稻谷中Cd与土壤中Cd有直线关系。

Character of heavy metals of main foodstuff crop and soil in three gorges reservoir

By collecting samples outdoor and analysis indoor,these results display that the coefficients of deviation of Cu,Zn,Pb,Cd,Fe and Cr in soil are less than 50%,and the contents of heavy metals are steady in three gorges reservoir.The coefficients of deviation of Cu,Zn,Pb,Cd,Fe,Mn and Cr in rice,and Pb,Cd,Fe,Mn and Cr in corn,and Cu,Pb,Cd,Fe,Mn and Cr in wheat are more than 50%.Many of heavy metals in soil,rice,corn and wheat belong to partial distributions.They have positive relativity between many of heavy metals in soil.Meanwhile,the exceeding obvious positive relativity is very obvious.It has positive and negative relativity between heavy metals in rice,corn and wheat,but the numbers of positive relativity are more than that of negative relativity.Between Mn and other heavy metals has obvious positive relativity in rice,corn and wheat,and they have obvious cooperating action.The contents of Pb,Cd and Cr of heavy metals in rice,corn and wheat exceed the national standard,and the pollution of heavy metals is obvious in main foodstuff crop.The content of Cd has linear relativity between rice and soil.