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油松是我国北方主要造林树种之一。我局从五十年代起到六十年代末,采用600—660穴/亩直播造林营造了57.3万亩,现已郁闭成林的31万亩,正在茁壮成长,成为我局的主要后备森林资源。为了研究探索对这部分后备资源的经营管理措施,1982年省林科所、局技术室、马泉林场共同在我场设立抚育间伐试验标地,间隔4年,1986年进行了复查。目前,标地林分生长良好,平均胸径7.0—10.3厘米,树高6.80米,每公顷蓄积量83.1062立方米,平均年生长量4.38(强)—7.40(次强)立方米。
Pinus tabulaeformis is one of the main afforestation species in northern China. From the 1950s till the end of the 1960s, our bureau constructed 573,000 mu live broadcast planting with 600-660 acre / acre and now it has 31 million mu forest and is growing into a major backup forest of our bureau. Resources. In order to study and explore this part of the reserve resource management measures, in 1982, the provincial Forestry Branch Office, Bureau of Technology, Maquan forest farm in my field set up joint tearing test standard, at an interval of 4 years, 1986 were reviewed. At present, the planted stands grow well with an average diameter at breast height of 7.0-10.3 cm and a height of 6.80 m. The volume per hectare is 83.1062 m3, with an average annual growth rate of 4.38 (strong) -7.40 (secondary) cubic meters.