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通过３ａ对杨粮间作的农作物产量和地上部分生物量的测定，初步确定农作物与幼林（２～４ａ生）间作，随着幼林的生长其产量是递增的，幅度为５．０％～８．０％，同时，间作地产量也比对照提高５．０％以上；与成林（８～１０ａ生）间作时，随着林木生长其产量是逐年下降的，同时在行距７～３０ｍ范围内，农作物产量随行距减少而下降。当行距为３０ｍ时，与对照相比，其小麦产量保证７５％以上，玉米或花生６５％以上。根据试验结果建议幼林间作采取小株距（３～４ｍ）大行距（１０～１５ｍ）的间作方式并且当杨树成林时，行距不应小于３０ｍ。
According to the determination of crop yield and aboveground biomass of intercropped Yangsang intercropping system, the intercropping of crops with young stands (2-4 years old) was preliminarily confirmed. The yield increased with the growth of young stands with the range of 5.0% -8. 0%. Meanwhile, the yield of intercropping was also increased by 5.0% or more compared with the control. When intercropping with Chenglin (8-10 years old), the yield of forest growing was declining year by year, while in the range of 7-30 m, Crop yield decreased with decreasing distance. When the row spacing is 30m, compared with the control, the yield of wheat is guaranteed to be over 75%, and that of corn or peanut is over 65%. Based on the test results, it is suggested that intercropping with small row spacing (3 ~ 4m) and large row spacing (10 ~ 15m) should be recommended for young forest intercropping and the spacing should not be less than 30m when poplar trees are forested.