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对桐麦间作系统内外的对比研究表明，系统内外小麦叶面蒸腾速率从开花期至成熟期均有所增加；开花期系统内外小麦叶面平均蒸腾速率分别为５．８４，５．７２ｍｍｏｌ·ｍ－２·ｓ－１，差别不显著；从灌浆期到成熟期，系统外对照点小麦叶面蒸腾速率比系统内高，系统内外小麦叶面平均蒸腾速率比为０．８１；１１时之前，系统内泡桐东冠下点小麦叶面蒸腾速率比西冠下点高，１１时之后则反之．从开花期至成熟期，系统内外小麦水分利用效率从上午到下午是递减的，且开花期高于灌浆期，灌浆期高于成熟期．开花期内系统内外各点小麦水分利用效率差别不明显．从灌浆期至成熟期，系统内泡桐冠下点小麦水分利用效率低于冠外点．从开花期至成熟期，系统内外小麦的水分利用效率随空气中水分饱和差的增加而降低，小麦每天的平均水分利用效率与每天空气中水分平均饱和差相关系数为－０．８８．
The comparative study on the intercropping system and the intercropping system showed that the transpiration rate of wheat leaves increased from flowering stage to maturity stage. The average transpiration rate of wheat leaves inside and outside the flowering stage were 5.84 and 5.72mmol · m -2 · s-1, the difference was not significant. From the filling stage to the maturity stage, the leaf transpiration rate of wheat in the control point outside the system was higher than that in the system, and the average transpiration rate of wheat leaves inside and outside the system was 0.81. Before 11, Under the system, Paulownia Dongguan under the crown of wheat leaf transpiration rate higher than the West crown, after 11 o’clock on the contrary. From the flowering stage to the maturity stage, the water use efficiency of wheat inside and outside the system decreased from morning to afternoon, and the flowering stage was higher than the filling stage, and the grain filling stage was higher than the mature stage. The differences of water use efficiency of wheat within and outside the system at flowering stage were not obvious. From the filling stage to the maturity stage, the water use efficiency of wheat under the paulownia crown in the system was lower than that of the crown. From flowering stage to maturity stage, the water use efficiency of wheat inside and outside the system decreased with the increase of water saturation difference in air. The correlation coefficient between average daily water use efficiency of wheat and daily average water saturation in water was -0.88.