摘要：The paper deals with irrigation tests on farmlands by using different water-quality sewages, andresearches on the distribution characteristics of various heavy metals (Pb, Cu, Zn and Cd) in soil onvertical direction after irrigation by different sewages, and the regularities of distribution of variousheavy metals in different parts of wheat and corn. The results show that the contents of variousheavy metals in soils of different irrigation areas are successively as follows: the industrial sewageirrigation area > the mixed sewage irrigation area > the domestic sewage irrigation area > the reclaimedwater irrigation area. In different irrigation areas, the regularities of distribution of the contents ofvarious heavy metals in wheat and corn are as follows: the content in the reclaimed water irrigationarea is less, next is in the domestic sewage irrigation area, the contents in the mixed sewage irrigationarea and the industrial sewage irrigation area are more. For the roots, stems and grains of wheat andcorn in different irrigation areas, the contents of various heavy metals in them are increasing continuouslywith the increase of heavy metals in soil; and for the same irrigation area, the contents of heavy metalsin the roots, stems and grains of wheat are higher than contents of Pb and Cd in grains of corn, whichhave exceeded National Food Safety Standards.
