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以１０年生苹果树为试材，探讨了几个品种的水分利用效率（ＷＵＥ）及有关参数的日变化，结果表明：①对ＷＵＥ而言，充足供水时，新红星＞富士＞红星；土壤干旱时，富士＞红星＞新红星。②土壤干旱时，富士的Ｐｎ和Ｐｎ／Ｃｉ较高，而Ｔｒ较低，说明富士对水分状况的反应较迟钝。③新红星的高Ｐｎ需以较高的Ｔｒ为代价。④无论是充足供水还是土壤干旱，富士的Ｇｓ始终远远小于新红星和红星，这对提高ＷＵＥ十分有利。
Taking 10 - year - old apple tree as test material, the daily water use efficiency (WUE) and the diurnal variation of related parameters of several cultivars were studied. The results showed as follows: ①Water supply was better with red star> Fuji> red star; Fuji> Red Star> New Red Star. ② In the case of soil drought, the Pn and Pn / Ci of Fuji are higher and the Tr is lower, indicating that Fuji’s response to water conditions is relatively slow. ③ New Pluto high Pn to Tr at a higher price. ④ Fuji Gs has always been far less than the new red star and red star, whether it is adequate water supply or soil drought, which is very beneficial to improve WUE.