黑龙江省的森林资源,近两年已被公认为“越采越少,越采越坏”。全省四十个林业局(不包括大兴安岭),有半数已资源枯竭,或接近枯竭。三十年来,全省森林蓄积量减少了16000万立米,森林质量也不断下降。过去针叶树占半数以上,现阔叶树却上升到60%。森林资源的减少,带来了采育失调的严重后果。一、采伐、更新方式的演变过程建国以来,黑龙江省的森林采伐、更新方式,经历三个演变过程。1、建国初期到1955年执行的是径级择 The forest resources in Heilongjiang Province have been generally recognized as “less and less and more and more and more bad” in the past two years. Forty of the province’s forestry bureaus (excluding Daxinganling) have depleted or nearly depleted resources by half. Over the past three decades, the province’s forest reserves have dropped by 160 million cubic meters and the quality of forests has been declining. In the past more than half of conifers, now broadleaf trees has risen to 60%. The reduction of forest resources has brought about serious consequences of maladjustment. I. Evolution of Cutting and Renewing Methods Since the founding of the People’s Republic of China, the methods of forest harvesting and regeneration in Heilongjiang Province have undergone three evolutionary processes. 1, the founding of the country to the implementation of 1955 is the path of choice