大兴安岭林区,是我国最大的林区和主要的木材生产基地,长期以来存在着更新跟不上采伐的矛盾。在水路交通比较方便的黑龙江沿岸一带,则又遗留下大面积的残次林,都急待更新。由于历年来森林火灾的发生,造成大面积的火烧迹地和森林采伐造成的采伐迹地,而且逐年增加。在这个人烟稀少、欠债过多的大 Daxinganling forest area, is China’s largest forest area and the main timber production base, there has been a long time since the update keep pace with the contradiction. In the more convenient waterway traffic along the coast of Heilongjiang, then left a large area of ​​second-hand forest, are urgently updated. Due to the occurrence of forest fires over the years, large-scale burned-out areas and deforestation caused by deforestation have been created and have been increasing year by year. In this sparsely populated, over-indebtedness