西安市郊区农业土壤中重金属污染状况研究

The research of heavy metal pollution from agricultural soils in the suburb of Xi′an region

对西安市郊农业土壤进行了取样调查分析.结果表明,Cu、Ni、Cr、Cd、Pb显著高于全国土壤背景值,其中Cd、Pb污染尤为严重,其含量的几何平均值(1.476mg/kg)为西安市土壤Cd背景值的5.15倍,全国土壤Cd背景值的15.216倍;Pb含量的几何平均值(107.721mg/kg)为西安市土壤Pb背景值的2.776倍,全国Pb背景值的4.143倍.通过相关性分析和主成分分析得出,污水灌溉是导致土壤中Cu、Zn、Ni、Cd、Pb积累的重要原因之一.

The investigation and analysis of the heavy metal contamination from agricultural soils was conducted in the suburb of Xi＇an region. The results showed that the concentrations of Cu,Ni,Cr,Cd, Pb are higher than the corresponding background levels of country soils. The pollution of Cd and Pb are more serious. Thegeometric mean of CA concentration is 5.15 times higher than the background levels of xi＇an Soils, 15. 216 times higher than the background levels of country soils, and Pb is 2. 776 times and 4. 143 times respectively. The correlation analysis and the principal component plot analysis demonstrated that sewage irrigation was the major source of Cu,Zn,Ni,Cd,Pb pollution in the soils.