我国东北林区对复层异龄林一般都采用“采育择伐”的方式。每年用这种采伐方式生产木材的林地面积约占东北林区每年采伐面积的6O％,而东北林区集材方式主要是采用拖拉机集材,约占90％以上。因此,拖拉机集材方式对“采育择伐”方式是否适合,即拖拉机集材对这种采伐方式的保留木损伤程度如何,以及是如何损伤的,这是当前许多 Forest in Northeast China stratified heterogeneous forest generally adopt the “selective cutting” approach. The annual forest area for timber production by this method of harvesting accounts for about 6% of the annual harvest area in the northeastern forest. However, the method of timber collection in the Northeast Forest Region mainly uses tractor skidding, accounting for more than 90%. Therefore, tractor skidding is a good fit for the “harvesting and cutting” approach, that is, how much damage the tractor skid does with this preserving timber and how it is damaged, which is currently many