The effect of Cd,Pb stress on scarenging system of activated oxygen indicated that content of chlorophyll,chlorophyll a/b ratio and activity of CAT gradually decrease,the activity of SOD increase first and decrease afterwards,the activity of POD gradually increase with the consistency of Cd,Pb treatment.Between Cd and Pb,there is a synergistical action on effect of scarenging system of activated oxygen.The results indicated that Cd,Pb stress affect scarenging system of activated oxygen and result in imbalan...