| Based on a long-term experiment,the soil organic carbon(SOC),readily oxidizable carbon(ROC) and microbial biomass carbon(MBC) of two sequence rotation systems with spring wheat and field pea in soil layer under different tillage patterns were studied.The results showed that the content of soil organic carbon(SOC) pool in conventional tillage with straw incorporated(TS),no-till without straw cover(NT),no-till with straw cover(NTS) were more than conventional tillage with no straw(T),and the content of SOC in 0～5 cm soil layer was higher than other layers,and decreased with the soil depth,especially in NTS.Correlation analysis showed that the indicator of ROC and MBC had the same response to the long-term tillage methods with SOC.They were significantly correlated to SOC.The accumulation of microbial quotient with NTS was more than other tillage patterns.The results demonstrated that the activity of the carbon in soil of NTS was higher and could convert easily. |