Abstract:Based on the investigation and evaluation of land quality, the accumulation characteristics of Cd, Hg , As, Cr, Ni, Cu, Zn, Pb in surface soil of Nanzhanglou Village, Qingzhou City were analyzed. The potential ecological risk of soil heavy metals was evaluated with different reference ratios, and the correlation analysis, cluster analysis and factor analysis of eight heavy metals were carried out. The results show that the background values of heavy metal elements in the surface soil of the study area are higher than those in Weifang City. Except that the variation coefficient of Hg element is 0.80, which belong to strong variation, other elements belong to weak variation to medium variation. Only one sample of Zn content exceeded the standard, and other samples of heavy metal content are lower than the risk screening values for soil contamination of agricultural land. When the risk screening values are used as the reference ratio of potential ecological risk assessment, the risk of heavy metal ecological pollution is very low. When the soil background values are used as the reference value of potential ecological risk assessment, the heavy metals are enriched in different degrees in the regional background. Correlation analysis show that there is significant correlation between multiple groups of heavy metals. Eight heavy metals are divided into three categories by cluster and factor analysis. The heavy metals with strong correlation or in the same category have certain homology.