土壤-小麦系统中5种重金属含量的相关分析

Correlation Analysis among the Contents of Five Heavy Metals in Soil-wheat System

采用盆栽方法,对土壤和小麦三叶期地上部分、成熟期籽粒的Cd,Pb,As,Cu,Zn 5种重金属含量进行了相关分析,结果表明,三叶期地上部分和成熟期籽粒中5种重金属含量均随土壤重金属含量的增大而逐渐增大,其中,籽粒与土壤重金属含量之间具有极显著的二次函数回归关系,而籽粒与三叶期地上部分重金属含量之间有着极显著的直线回归关系;在土壤-小麦系统中,5种重金属在籽粒中的富集能力依次为:Zn>Cd>Cu>As>Pb。

Different heavy metals have different behavior in soil-wheat system. The pot experiment of Zhengmai-9023 was carried out during 2002--2004 at Henan Normal University. The contents of Cd,Pb,As,Cu and Zn in soil,above-ground part at three-leaf stage and grains at mature stage were analyzed. The results showed that the contents of these five heavy metals in above-ground part at three-leaf stage and grains at mature stage were all raised gradually with the increasing concentration of heavy metals in soil. The statistic analysis presented a highly significant quadratic regression relation between contents of heavy metals in grains and in soil,and a highly significant liner regression relation between contents of heavy metals in grains and in above-ground part. The order of enrichment ability of the five heavy metals in grains was Zn〉Cd〉Cu〉As〉Pb.