EFFECTS OF CHLORIMURON-ETHYL ON SOIL MICROORGANISMS AND ENZYME ACTIVITIES UNDER MODERATE SALT STRESS

Soil microorganisms and enzyme activities were important indicators of soil ecosystem responses to environmental stresses. The impacts of salt and chlorimuron-ethyl mix on soil enzyme activities and microorganism population in soil was examined. Results showed that the moderate salt stress could lead to a certain degree of decrease of soil bacteria, actinomyeetes and fungi. However, under moderate salt stress, chlorimuron-ethyl did not significantly affect the three types of microorganisms. Chlorimuron-ethyl could activate bacteria under non-salt stress, while the fungi and actinomyeetes were inhibited. In addition, the activities of soil invertase, urease, catalase and phosphatase were inhibited in varying degrees by salt stress. The effect of chlorimuron-ethyl on the activities of various soil enzymes was different, and it can activate catalase, inhibit soil invertase, no significant effect on urease and phosphatase. The correlation analysis showed that the number of soil bacteria, actinomyeetes and fungi were positively correlated with the activities of invertase, urease, catalase and phosphatase in soil.