To explore the effects of different tillage methods and straw recycling on soil respiration and microbial activity in summer maize field during the winter wheat and summer maize double cropping system,substrate induced respiration method and CO2 release method were used to determine soil microbial biomass carbon,microbial activity,soil respiration,and microbial respiratory quotient.The experiment included 3 tillage methods during the winter wheat growing season,i.e.,no-tillage,subsoiling and conventional ti...