在森林抚育过程中进行强度得当的疏伐,不仅能增加林木的生长量,而且能改善木材的物理性质,提高木材的机械强度;而木材的物理性质直接关系到它的使用价值。例如一个年产10万吨木浆的制浆厂,如果原木的密度降低5％,要保持原有的产量,每年就得多消耗掉26000立方米原木。至于木材机械强度对于用材的意义就不言而喻了。 Intensive deforestation in the forest tending process can not only increase the growth of trees, but also improve the physical properties of wood and improve the mechanical strength of wood. The physical properties of wood are directly related to its value. For example, a pulp mill with an annual output of 100,000 tons of wood pulp, if the density of logs is reduced by 5%, to maintain the original output, consume an additional 26,000 cubic meters of logs per year. As for the mechanical strength of timber timber is self-evident.