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抚育间伐是根据培育目的,调整林分结构,改善森林生态环境,提高林木质量和生长量,缩短经营周期一种集约经营方式。几年来,我局利用这一经营方式对天然中幼林共抚育200多万亩,出材110万m~3,对促进木材生长和提高企业经济效益起到了重要作用。但是,在抚育伐作业过程中,大量的没有利用价值的剩余物,堆积在林冠下,使林内卫生条件越来越差,不仅为病虫鼠害繁衍提供了场所,而且增加了林内自然物载量,使火险等级上升,据1989年
Tending thinning is based on the purpose of cultivation, adjust the stand structure, improve the forest ecological environment, improve forest quality and growth, shorten the business cycle of an intensive management. In recent years, our bureau has used this mode of operation to raise more than 2 million mu of natural medium-sized and medium-sized forests and 1.1 million m 3 of raw materials. This plays an important role in promoting the growth of timber and improving the economic efficiency of enterprises. However, during the tending and cutting operations, a large amount of unused value residue accumulated under the canopy degraded the hygienic condition in the forest, which not only provided a place for the multiplication of pests and diseases but also increased the natural quantity of the forest , So that the level of fire insurance rose, according to 1989