The results are as follows:(1)The wheat at the north side of shelter?forest belt had a lower output. It is much lower than that on contrast district and also lower than that at the west side of forest?belt.

• 结果表明:(1)林带附近小麦产量明显低于对照区产量,林带对其北侧小麦产量影响的程度大于对西侧,且胁地范围比西侧的大;