Abstract:

Abstract: Dynamics of soil enzymes activities ( soil urease, alkaline phosphatase，cellulase) were studied under two types of tillage and different microbial inoculants during winter wheat growing periods based on straws returned in a field experiment. The results showed that there were no significant differences in soil urease and cellulase activities between the rotary tillage and deep plowing during wheat growth period, however, soil alkaline phosphatase activity was significantly increased by the rotary tillage. During the wheat growth stages, soil urease activity reduced markedly at jointing stage and increased gradually with nitrogen fertilizer applied, even reached the peak at the booting stage. Soil alkaline phosphatase activity increased slightly with increasing of growing stages. Soil cellulase activity reduced gradually from turning green stage to jointing stage and was the minimum at jointing stage, while the cellulase activity showed the increasing trend for urea application from jointing stage to wheat maturity. Moreover, the soil enzymes activities in rhizosphere were significant higher than those in non-rhizosphere during whole growing stage of winter wheat. Finally，the different microbial inoculants application had no markedly effects on the activities of three soil enzymes.