浙江省主要优势农产品产地土壤-农作物镉含量空间分布及相关性研究

Spatial Pattern and Interrelation of Total Cd in Soils and Crops Across the Agricultural Regions of Zhejiang Province, China

针对目前土壤-农作物镉污染问题，以浙江省40个县（市、区）主要优势农产品产区为研究对象，在粮食、油菜、蔬菜种植地以及茶园和果园土壤中共采集898个单元土壤样品及相对应的五大类农作物，并对其镉含量进行分析评价；同时采用富集系数比较不同农作物对土壤重金属镉的吸收差异。结果表明，研究区产地土壤和农作物的镉含量存在一定程度超标，土壤超标率为10.69%，农作物超标率为4.57%。不同农作物对土壤镉的富集系数差异较大，变化范围在0.002～0.257之间。土壤-农作物镉含量的相关性并不显著。

In the study, a total of 898 soil samples and the corresponding crops were collected from paddy field, vegetable land, tea garden and fruit land in Zhejiang province. The total Cd content of soils and crops were chemically analyzed in the laboratory. The difference of the concentration index among the five groups of crop was compared. The result showed that 10.63%of the whole soils were assessed as the pol-luted level according to the second grade of Standards for Soil Environmental Quality of China（GB 15618-1995）, and 4.57%of the crops were polluted. The concentration index among the five groups of crops was obviously different, changing from 0.002 to 0.257, while no signifi-cant correlation of total Cd content existed between soils and the relative crops.