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以１０年生新红星苹果树为试材，探讨了旺长树、丰稳树和衰老树３种植株类型的水分利用效率（ＷＵＥ）及有关参数的日变化。结果表明：（１）无论是充足供水还是土壤干旱，ＷＵＥ顺序均为丰稳树＞衰弱树＞旺长树；（２）土壤干旱提高了旺长树的ＷＵＥ，而降低了丰稳树和衰弱树的ＷＵＥ；（３）土壤含水量的降低对光合的负影响旺长树最小、丰稳树次之，衰弱树最大。
Taking 10-year-old New Star apple tree as test material, the daily variation of water use efficiency (WUE) and related parameters of three plant types including Mongolian longan tree, abundance tree and aging tree were discussed. The results showed as follows: (1) The order of WUE was Feng-shu-wei> Weak-tree> Vigna radiata both in adequate water supply and in soil drought; (2) Soil drought increased the WUE of Vigna radiata and decreased abundance of trees and weakness WUE of trees; (3) The negative effect of soil water content on photosynthesis is the smallest of vigorous trees, followed by abundance of trees, the largest of which is weak trees.