This paper has collected 5013 surface soil samples to determine the contents of Cd,Hg,As,Pb,Cr,Cu,Ni,Zn,and pH values,and has chosen single factor pollution index method and ground accumulation index method to evaluate the status of heavy metal pollution in crop-soil an...MORE This paper has collected 5013 surface soil samples to determine the contents of Cd,Hg,As,Pb,Cr,Cu,Ni,Zn,and pH values,and has chosen single factor pollution index method and ground accumulation index method to evaluate the status of heavy metal pollution in crop-soil and ...