Effects of Herbicide Chlorimuron-ethyl on Activities of 6 Kinds of Enzymes in Soil

A series of incubation experiments in lab were conducted to study the effects of different concentrations of herbicide Chlorimuron-ethyl on the activities of 6 kinds of enzymes in soil. The results indicated that the treatments with low concentration( 5,10 μg/kg dry soil) of Chlorimuron-ethyl could inhibit the activities of saccharase and dehydrogenase,and activate the activities of urease,catalase and acid phosphatase in soil within a short time,but these effects would disappear rapidly. The treatments with high concentration( 20,50 μg /kg dry soil) of Chlorimuron-ethyl could inhibit the activity of dehydrogenase at first and then strongly activate its activity,and these treatments also could inhibit the activities of other 5 kinds of enzymes in soil. There was a positive correlation between the extent of these inhibitions or activations and the concentration of Chlorimuron-ethyl. The activities of various enzymes in soil were less influenced by low concentration of Chlorimuron-ethyl,and they could recover basically in the later period of the experiment. While the activities of enzymes in the soil treated with high concentration of Chlorimuron-ethyl were not easy to recover.