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桐麦间作系统内外小麦的对比研究表明，开花期和灌浆期系统内外各点小麦旗叶的最大光合速率差异不明显；成熟期小麦旗叶的最大光合速率明显下降，并且系统内低于系统外，西冠下低于东冠下．系统内外各点小麦群体光合速率的日变化与其接收的光合有效辐射量的变化规律基本上是一致的．开花期系统内外各点小麦群体总光合差异不明显，灌浆期和成熟期差异较明显，其中灌浆期系统内各点仅为对照的４０％～６６％，且冠外点明显高于冠下各点，西冠下点又稍高于东冠下点；成熟期总光合量较小，系统内各点仅为对照的２０％～５５％．系统内外各点小麦产量与开花期至成熟期群体光合量关系十分密切．各点干物质产量与作物产量比值（ξ）在０．５２～０．７７之间，其中，对照区与系统内冠外点ξ值比系统内冠下各点要低，而东冠下各点稍大于西冠下各点，ξ值的变化与种子数量呈反比．千粒重与灌浆期总光合量紧密相关．
The comparative study of wheat and wheat in Tongmai intercropping system showed that the maximum photosynthetic rate of wheat flag leaf was not obvious at the flowering and filling stages; the maximum photosynthetic rate of flag leaf of wheat decreased significantly at the flowering and grain filling stages and was lower than that outside the system Under the crown below the East crown. The diurnal variation of photosynthetic rate and the variation of photosynthetic active radiation received by each point within and outside the system were basically the same. There was no significant difference in total photosynthesis between the wheat plants at the inner and outer flowering stage and the difference between the filling stage and the mature stage. The points in the system at filling stage were only 40% ~ 66% of the control, Point, the point of Xiguan and slightly lower than the crown; the total amount of mature photosynthesis is small, the system points only 20% to 55% of the control. The relationship between wheat yield at each point in the system and the photosynthesis of flowering and mature populations was very close. The ratio of dry matter yield to crop yield (ξ) at each point ranged from 0.52 to 0.77, in which the ξ values of the out-point and out-point in the control zone and the system were lower than those in the subsystems under the crown, Point slightly larger than the West Crown under the points, ξ value changes and the number of seeds was inversely proportional. 1000-grain weight and filling the total amount of photosynthesis is closely related.