苏联用砍伐法保养防护林带,改善了林带的通风,避免大雪堆积耽误了春耕,又便于行间的机械化护林,扩大耕地面积。苏联现有防护林带150万公顷,其中60万公顷需要用砍伐法保养。据苏报报道,这项工作应在秋、冬或早春季节进行。首次砍伐时间最好定在落叶的秋季,一股砍伐直径在8厘米以上的树木。单一树种的防护林带,应砍伐干枯的,发育缓慢的或有严重创伤的树木;在以柞木为主的混和林带,则应砍伐妨碍柞木树冠发育的树木。为了改善林带的下部通风状况,应砍去丛生的灌木和挖出树根。有的林带,远离地面1—2.5米处的多余树叉都应清除。老树 The Soviet Union used the felling method to maintain the shelterbelt, improved the ventilation of the forest belt, avoided the plowing of snow and delayed the spring plowing, and facilitated the mechanized deforestation and the expansion of cultivated land. The Soviet Union now has 1.5 million hectares of shelterbelts, of which 600,000 hectares need to be maintained by felling. According to the Soviet newspaper reported that this work should be carried out in autumn, winter or early spring. The best time to harvest the first set in the autumn leaves, a felling more than 8 cm in diameter trees. Single tree species of shelterbelts should be deforested, slowly developing or severely traumatic trees; in the oak-dominated mixed forest belt, trees that impede the crown development of oak trees should be deforested. In order to improve the ventilation of the lower part of the forest belt, the tufted shrubs should be cut off and the root of the tree dug out. Some forest belt, 1-2.5 meters away from the ground should be removed excess tree fork. Old tree