土壤水亏缺及杨树遮荫等其它原因造成复合系统农作物减产趋于严重，其中林龄3年的杨农复合系统的小麦玉米产量减产平均达到35%。

The production of crops in agroforestry decreased seriously because of lacking of soil water and illumination and so on, production of wheat and corn in 3 years agroforestry system decreased by 35%.

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