目前我国人工林不仅面积逐年增加、间伐任务量不断增长,而且北方部分落叶松人工林已进入第四次间伐期。因此,适时进行人工林的抚育间伐,不仅对提高林木质量、促进林木速生丰产有着重要的作用,而且也 At present, not only the area of ​​planted forest in our country increases year by year, but the amount of task of thinning is increasing continuously. And part of larch plantation in the north has entered the fourth thinning period. Therefore, the timely tending thinning of plantations not only plays an important role in improving the quality of forest trees and promoting fast-growing trees, but also