黑龙江省林区营造的落叶松人工林现已大面积成林。目前,20年生以上的已达到150万亩。据调查,20～25年生落叶松人工林,连年生长量和平均生长量开始下降。一般,这种林分的平均胸径为12厘米,平均树高13米,已经具有较高的使用价值和经济价值,可以用作建筑杆材和其它民用材。对这部份人工林的经营,根据森林采伐更新规程的 Larch plantations in Heilongjiang Province have now become large-scale forests. At present, more than 20-year-old has reached 150 million mu. According to the survey, 20-25 years old Larix plantation, annual growth and average growth began to decline. In general, the average diameter at breast height is 12 cm and the mean tree height is 13 m. It has high value and economic value and can be used as building bar and other civil timber. The management of this part of the plantations, according to the rules of the forest logging update