The corn stalk was used as the zymolyte to study the effects of exogenous cellulase on the activity and substrate enzymolysis rate of native celluase in soil under pH 6.5 and 27℃ by the laboratory simulation method.The results indicated that after the addition of exogenous cellulase,the total enzyme activity increased,and the native soil collulase activity was higher in 3~7 days after culture.The enzyme activity got to the peak on the 4th day,and then decreased.The exogenous cellulase could increase the sub...