论文部分内容阅读
华北落叶松在承德地区的各种松类中生长最快。据调查在围场县北沟林场吉布汰作业区31年生平均树高15米,胸径18—22厘米。在塞罕坝机
Larix principis-rupprechtii grows fastest among various species of pine in Chengde. According to the survey, the 31-year-old average tree height in the 31-year-old Zhiguzhi operation area in Beigou Forest Farm, Weichang County, is 15 meters high with a diameter of 18-22 cm. Saihan dam machine