Study on Greenhouse Soil Heavy Metals in Five Pollution-free Vegetable Bases in Taiyuan

The paper investigated the development condition of Taiyuan pollution-free vegetable bases and chose five representatives of them,make laboratory analysis of greenhouse soil heavy metals As,Hg,Pb,Cd,Cr in the soil by the sampling.We drew our conclusions as follows: The proportions of heavy metals As,Hg,Pb,Cd,Cr in the soil of five bases are not the same,but it conforms to the related standard,and does not exceed the standard;The heavy metal contents and individual pollution indexes were higher in 0~20 cm soil horizon than in 20~40 cm horizon,and As'pollution index is the highest among them;The synthesis pollution index of the surface layer soil in 3 pollution-free vegetable bases approaches the cordon of the comprehensive pollution index,but the lower layer soil still is under the pollution-free condition.