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对桐麦间作系统内外各点光量与小麦产量对比研究表明：对照区的入射光量和小麦截获光量一直大于系统内各点，系统内各点离树行越近截获的光量越小．小麦截获光量与入射光量的比值在系统内各点变化不大，在开花期、灌浆期和成熟期，系统内的平均比值分别是０７８，０６９和０４５，系统外分别是０９４，０８８和０６３．就小麦产量来讲，系统内平均比系统外低５１２％，系统内冠下各点平均较冠外点平均低１９％，东冠下各点平均较西冠下各点平均低２４４％．单位面积小麦种粒数和千粒重与产量的变化趋势相同，系统内较系统外平均分别低３５５％，２５３％，冠下各点平均较冠外各点平均分别低１１３％，７４％，东冠下两点平均较西冠下两点平均分别低１３１％，１３４％．系统内外各点小麦产量可用其开花期至成熟期的截获光量进行预测．单位面积小麦的种粒数与开花期截获光量，种子千粒重与灌浆期所截获光量的相关关系十分紧密．
The comparison between the light intensity and the wheat yield at each point inside and outside the Tongmai intercropping system showed that the amount of incident light and the amount of intercepted wheat in the control area were always greater than those in the system, and the smaller the amount of light intercepted by each point in the system. The ratio of the amount of intercepted light to the amount of incident light did not change much at all points within the system. The average ratios of the wheat within the flowering, filling and maturing stages were 078, 069 and 045, respectively 0 94,0 88 and 0 63. In terms of wheat yield, the average inside system was 51.2% lower than that outside the system. The average points under the system were 19% lower on average than the external points. The average points under the canopy were 24 points lower than the average points under the canopy. 4%. The trend of the number of grain per unit area of wheat was the same as that of 1000-grain weight. The average outside of the system was 35.5% and 25.3% lower than that outside the system. The average scores of the points under the crown were 11.3% , 7 4%, the average crown two points lower than the West crown under the average of 13 1%, 13 4%. The yield of wheat at each point within and outside the system can be predicted by the amount of intercepted light from flowering stage to mature stage. The correlation between the number of seeds per unit area of wheat and the amount of intercepted light at the flowering stage, the seed weight per 1000 seeds and the amount of light intercepted at the filling stage was very close.