Based on a long-term field experiment,the effects of no-tillage with wheat stubble mulching(NTS),no-tillage without wheat stubble mulching(NT) and conventional tillage(T) on soil respiration of winter wheat were studied in oasis irrigated area,Northwest China.The results showed that soil respiration rates appeared in single-peak curve during diurnal and seasonal changes under three tillage treatments.The maximum of diurnal soil respiration rate under NTS treatment occurred at 15: 00,but those of NT and T tr...