目前,一些林业局的主伐伐区和天然次生林抚育伐的部份伐区,集材方式多数采用集材拖拉机伸入采伐腹地进行集材的作业方式。这种集材方式不可避免地使采伐后迹地保留树遭到不同程度的破坏(非皆伐区更明显),个别伐区基本上无保留树,造成后备资源严重短缺。而在我国林业目前处于“两危”的情况下,如何保护 At present, some forestry cutting areas and natural secondary forest tending and cutting part of the cutting area, the majority of the way of using a timber tractor into the felling of the hinterland for the operation of timber operations. This kind of skidding method inevitably causes the deforested trees to be damaged to different extents (not the clear-cutting areas are more obvious), and there are basically no reserved trees in individual cutting areas, resulting in a serious shortage of reserve resources. In our country forestry is currently “at risk” situation, how to protect