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伊春林区1952年开始进行人工更新和造林,截止1984年,人工林成林面积已达199,411公顷,蓄积9005261立方米。其中落叶松人工林面积为91717公顷,蓄积为4702387立方米,分别占人工林面积和蓄积的45.99%和52.22%。目前这些落叶松人工林已有8%进入中龄林。早期营造的林分,已有近30年的经营历史,开始进入近熟林龄组。因此,在人工林的利用和更新中,合理确定主伐龄和经营周期,已成为当前生产中急待解决的突出问题。建国初期,我们曾把落叶松人工林的经营周期定为41～50年。但通过30多年林业生产实践和落叶松各材种在国民经济中的使用
Yichun Forest started artificial regeneration and reforestation in 1952. By 1984, the forest area of artificial forests had reached 199,411 hectares and accumulated 9005,261 cubic meters. Larch plantation area of which 91,717 hectares, stock volume of 4702387 cubic meters, accounting for 45.99% and 52.22% of the plantation area and accumulation respectively. At present, 8% of these larch plantations have entered the middle-aged forest. Early to create the stand, has nearly 30 years of operating history, began to enter the near-mature forest group. Therefore, in the utilization and renewal of plantations, reasonably determining the main cutting age and business cycle has become an outstanding problem to be solved urgently in current production. In the early years after the founding of New China, we had set the operating cycle of larch plantation for 41 to 50 years. However, through more than 30 years of forestry production practices and the use of larch species in the national economy