桐麦间作系统内外的对比研究表明，试验期间系统内小麦平均光能利用率是系统外的１３３．３％，光能利用率在１１时～１３时之间最低．整个时段平均光合速率为系统外对照点的８７．６％，其中，小麦抽穗开花期为９７．９％，灌浆期为８６．３％，成熟期为７８．６％．桐麦间作对小麦光合作用的影响主要在灌浆期与成熟期．光合速率在１１时～１３时之间是最大的，呈单峰曲线．桐麦间作系统对小麦叶面ＢａｌＢｅｒｙ指数的影响，表现在灌浆期末期和成熟期，在小麦抽穗开花期没有影响．从抽穗开花期到灌浆期和成熟期，小麦光合作用与光量的关系逐渐减小． The comparative research between Tongmai intercropping system both inside and outside showed that the average light energy utilization rate of wheat within the system was 133.3% outside the system during the experiment, and the light energy utilization rate was the lowest between 11 and 13 o’clock. The average photosynthetic rate of the whole period was 87.6% of the control points outside the system. Among them, the heading and flowering stages of wheat were 97.9%, the filling stage was 86.3% and the maturity stage was 78.6%. Tongmai intercropping wheat photosynthesis mainly in filling and maturity. The photosynthetic rate was the largest between 11 and 13 o’clock, showing a single peak curve. The effects of Tongmai intercropping system on the BalBery index of wheat leaves were observed at the end of grain filling and maturity stages and had no effect on the heading and flowering stages of wheat. The relationship between photosynthesis and light intensity decreased from heading to flowering and maturity.