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梨树县林业科技推广总站,为了解决农田防护林带的胁地减产问题。经过二年多的试验证明:林带胁地距离为树高的一倍多,若以林带平均高15米,375亩林网计算,其胁地面积为林网面积的11.76％,胁地段内的农作物,平均减产61.59％,折占林网面积的7.24％,占林网保田增产数量的65.16％。上述试验说明,虽然林带的防护效益是增产一大片,而减产只是一条线,但是这种影响农民积极性的现实问题,却不容忽视。
Lishu County Forestry Science and Technology Extension Station, in order to solve the problem of cropland shelterbelt production reduction. After more than two years of testing, it has been proved that the distance between shelterbelts and shelterbelt is more than double the tree height. If the average shelterbelts are 15m and 375 mu, the threatening land area is 11.76% of the area of the shelterbelts Crops, with an average yield reduction of 61.59%, account for 7.24% of the area covered by the forest and accounted for 65.16% of the total area of the forest. The above experiment shows that although the protection benefit of forest belt is a large increase of production and the reduction of production is only a line, the realistic problem that affects the enthusiasm of peasants can not be ignored.