Evaluation on Environmental Quality of Pb,Zn and Cu Contents in Vegetable Plantation Soils and Vegetables in Hangzhou Suburb
杭州市郊蔬菜基地土壤和蔬菜中Pb、Zn和Cu含量的环境质量评价

Contents of heavy metals(Pb,Zn,Cu) in soils from 4 main vegetable plantations in Hangzhou suburb were investigated to evaluate environmental quality of heavy metals of soils and vegetables.Different evaluation methods and evaluation standards of heavy metals were used for comparison.Kriging method was applied to study the spatial variability of heavy metals in soil-vegetable system. The distribution maps of the spatial variability of heavy metals in soil-vegetable system in Jianggan District were obtained based on GIS method.The results show that the soils were polluted with Pb,Zn,and Cu using natural background values as evaluation standard.While using National Standard as evaluation standard,the soils were not polluted.Contents of heavy metals in Gongshu District were the highest of four investigated districts.The concentration distribution of heavy metals had different spatial variability.The content of Pb in vegetables was higher than those of Zn and Cu and exceeded the national vegetable sanitation standard.The order for their enrichment coefficients was as follows: Zn>Pb>Cu.The accumulation coefficient for green vegetable was higher than that of Chinese cabbage,indicating green vegetable could easily accumulate heavy metals from soils than Chinese cabbage.