安阳周边农田土壤和小麦籽粒中重金属含量的相关及主成分分析

重金属作为一类主要的污染物近年受到人们的广泛关注，为了解安阳地区土壤和小麦籽粒重金属状况，采集了周边农田土壤和小麦籽粒样品各60个。运用相关分析法及主成分分析法，探讨了土壤和小麦籽粒中重金属含量的分布特征。结果表明：土壤和小麦籽粒中各元素的变异幅度和均值差异较大，各元素在小麦籽粒中含量低于土壤中含量。土壤中重金属Cr、Mn、Fe、Ni、Cu之间有明显的相关性。小麦籽粒重金属Fe、Pb与土壤重金属Cr、Mn、Fe、Ni、Cu有明显的相关性，小麦籽粒重金属Cd含量与土壤中Cd、Pb含量有明显的相关性。重金属Cr、Mn、Fe、Ni、Cu、Cd、Pb在第一主成分上有很高荷载，且在第一主成分上的荷载远大于在第二主成分上的荷载。安阳地区小麦籽粒中重金属Cr、Mn、Fe、Ni、Cu、Cd、Pb来源具有一定的相似性。

Heavy Metal Content of Soil and Wheat Seeds Around Anyang: Correlation and Principal Component Analysis

Heavy metals, as a major class of pollutants, have received much attention in recent years. To understand the status of heavy metals in soil and wheat seeds in Anyang, 60 samples of soil and wheat seed each were collected from agricultural fields. Correlation analysis and principal component analysis were conducted to identify the distribution characteristics of heavy metal contents in soil and wheat seeds. The results show that the variation range and mean value of each element’s content in soil and wheat seeds are quite different, and the content of each element in wheat seeds is lower than that in soil. There is a significant correlation among heavy metal Cr, Mn, Fe, Ni and Cu in soil. Heavy metal Fe and Pb in wheat seeds are significantly correlated with heavy metal Cr, Mn, Fe, Ni and Cu in soil. Heavy metal Cd content in wheat seeds is significantly correlated with heavy metal Cd and Pb contents in soil. Principle component analysis reveals that heavy metal Cr, Mn, Fe, Ni, Cu, Cd and Pb have high loads on the first principal component, and the loads on the first principal component are much larger than those on the second principal component. The sources of heavy metal Cr, Mn, Fe, Ni, Cu, Cd and Pb in wheat seeds from Anyang have some similarity.