Two-year-old field sweet cherry trees(Prunus avium L.‘Hongdeng'/Cerasus sachalinensis Kom.)were used to study the effects of different cutting back pruning degrees on characteristics of distribution of 13 C and 15 N,and as well as utilization of 15 N. The results showed that the cutting back pruning promoted the carbohydrates to root system distribution at the new shoot growing stage. The extremely heavy cutting back pruning reduced the 13 C distribution ratios to the leaves and new shoots respectively by 2...