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我国现有中、幼龄林9亿亩,其中急待抚育的有3亿5千万亩,折合2300万公顷,如果采伐的重复期按10年计算,每年尚应间伐抚育230万公顷。每公顷平均出材量按8立方米计算,还可以生产木材和林产品1840万立方米。如果再把进行生长伐的近熟林和最近一个经理期(10年)内不拟进行主伐的成熟林的卫生采伐量计算在内,各种木材和林产品的采伐量要在2千万立方米以上,相当于目前国家统配木材产量的一半。目前仅黑龙江省营林系统的各县局所属林场每年的间伐生产量就在150万立方米左右,这是很大的生产潜力。如原把企业局的间伐利用开展起来,其数目就相当可观了,因此间伐生产的木材是一项不可低估的木材生产量。它会大大缓和我国目前木材供应不足的现象。所以间伐利用在林业生产中应古有极其重要的地位。
China currently has 900 million mu of medium- and young-aged forests, of which 350 million mu are urgently to be nurtured, equivalent to 23 million hectares. If the harvesting period is calculated on the basis of 10 years, 2,300,000 hectares should be tending thinning each year. The average output per hectare is calculated at 8 cubic meters, and it can also produce 18.4 million cubic meters of timber and forest products. If we then take into account the amount of sanitary harvests of near-mature forests for growing crops and mature forests that are not planned to be re-harvested during the most recent ten-year period (10 years), harvesting of various types of timber and forest products should be 20 million cubic meters More than one meter, equivalent to half of the current state’s total output of timber. At present, only the forest farms owned by counties under the forest management system in Heilongjiang Province have an annual production volume of about 1.5 million cubic meters, which is a great potential for production. If the original use of thinnings of business bureaux is carried out, the number is considerable, so the thinned wood production is an inestimable amount of wood output. It will greatly ease the current shortage of timber in our country. Therefore, the use of thinning in the forest production should have an extremely important position.