Distribution and Evaluation of Soil Heavy Metal in Green Food Producing Area

To research the content and concentration of heavy metals in soil of green food producing areas,the study was performed in a town named Zhouxiang in Cixi city.The study evaluated the heavy metal contents in soil using the integrative index approach,and based on the geo-statistical method,analysing the distribution of heavy metal in soil and drawing the distribution figures.The results showed that all the single polluted index of eight heavy metals was exceed 1,this suggests that all the heavy metal elements bring the pollution to soil in this area.The integrative index calculated by Nemerow method is 1.54,suggests that the soil is belongs to the slight pollution level.With the change of location and land use type,heavy metal contents in soil increase from north to south.The research of heavy metal in different soil profiles showed that heavy metal assembles in top soil or sub-soil,the contents of heavy metal in soil decreasing with the sample layer deep added,these suggests that heavy metal in soil of this area is strongly affected by human being.