舟山市无公害蔬菜基地土壤环境质量评价

对舟山市无公害蔬菜基地土壤中的Pb、Cd、Cr、Hg、As、HCHs、DDTs的含量进行了测定,以国家标准《农产品安全质量:无公害蔬菜产地环境要求》(GB/T 18407.1-2001)中土壤环境质量标准值为依据,采用单因子污染指数法和内梅罗综合污染指数法评价了土壤环境质量。结果显示,Pb、Cd、Cr、Hg、As、HCHs、DDTs的含量均低于无公害蔬菜产地要求的土壤质量指标值,说明土壤质量满足无公害蔬菜的生产。污染指数评价结果显示,7个监测项目的单因子污染指数均小于1.0,表明土壤未受到污染;个别蔬菜基地的综合污染指数值略大于0.7,污染程度达到警戒线,其余均小于0.7,说明舟山无公害蔬菜基地土壤环境质量整体上处于安全级别。

Assessment of Soil Environmental Quality of Harmless Vegetable Bases in Zhoushan City

The contents of Pb,Cd,Cr,Hg,As,HCHs and DDTs in surface soil of harmless vegetable bases in Zhoushan city were analyzed.The soil environmental quality was evaluated with single factor index and comprehensive pollution index based on standard such as GB/T 18407.1-2001.The results showed that the contents of Pb,Cd,Cr,Hg,As,HCHs and DDTs were all under the limit values prescribed by national standard (GB/T 18407.1-2001).It showed that the soil environmental quality was fit for production of harmless vegetable.Single factor indexes of pollution factors were lower than 1.0,which showed that the soils weren’t polluted.Comprehensive pollution index of pollution factors in individual vegetable base was slightly higher than 0.7 and the soil pollution degree reached guard line.The others were all lower than 0.7.The results indicated that the soil environmental quality of harmless vegetable bases in Zhoushan city belonged to safety degree on the whole.