The results show that not only the porosity does greatly affect the windbreak, but also the tree distance does.The distance is not beyond 1.3 to avoid air leak.

• 结果表明：不仅林冠疏透度对防护林带的遮蔽防风有明显影响，而且树木间的株距对林带整体的遮蔽效果也有比较显著的影响，为避免穿流风对遮蔽效应的影响，林带宽距比不宜超过1.；3；