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By means of both pot and field tests,this paper studied the contents of Cd,Pb,Cu,Zn and As and their ecological effects on plant-soil system.in tissues of crops and soil microorganisms.It was found that there exist synergistic effect among these five elements,especially for Cd in combination.The reclaniation of soil polluted by these elements in combination is rather difficult to be carried out.The distinctive ecological and chemical behaviors between Cd and As make various reclamation measures less applicable,and thus,further research measures are necessary.
