Effects of Chlorimuron-ethyl on the Enzyme Activity in Soil

The effects of chlorimuron-ethyl on soil enzyme activity were investigated,using urease,invertase and alkaline phosphatase as test parameters.5 soil samples(400g) were taken,and incubated at 25℃with 60% relative soil moisture content and 0,3,6,12,24,48 μg·kg~(-1)Chlorimuron-ethyl concentration in soil.Analysis of enzyme activity was conducted in day 1,3,5,7of incubation.The results showed Chlorimuron-ethyl had inhibition or stimulation effect on the activities of the tested soil enzymes.The inhibition ratio of alkaline phosphatase activity was over 26%.But there was no significant effect on soil urease.Compared with urease,invertase was stimulated and inhibited significantly,the ratio reached 20% and 30%,respectively,which demonstrated the fact that invertase was most sensitive to chlorimuron-ethyl.In addition,the activities of all three tested soil enzymes fluctuated with time.