一、为什么要进行抚育间伐。森林(或成片林)里的树木,随着年龄的增长,单株林木所需要的营养而积和所占的空间也不断扩大,而单位面积内的营养物质、阳光、水分、空气等是有限的,只能满足一定数量的林木生活,因此,林木个体之间便产生“生存竞争”,又由于树木个体遗传 First, why do we need to tending thinning? The trees in the forest (or in the form of a forest) increase with age, and the space required for the nutrition of individual trees also expands. The nutrients, sunshine, moisture and air per unit area are Limited, can only meet a certain number of forest life, therefore, there will be “competition for survival” among forest individuals, and due to the individual genetic tree