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红松人工林早期分叉是培育优质用材林的一项重要障碍。本文以68块样地6686株红松人工林(18—30年生)的调查材料为基础,阐明以下几点: 1.伊春林区红松人工林大多数林分生长发育是正常的,平均分叉率为20％,只有10％的林分分叉是严重的。因此培育具有高大干材的红松林是可能的。 2.造成红松早期分叉的直接原因主要是松梢象鼻虫(Pissodes hitidus Roelofs)的危害,占分叉数的60％,结实和采种伤害为12.5％。 3.抑制早期分叉的最好方法是保持合理的林分结构,存有天然阔叶树的红松人工林,尤其是复层阔叶—红松林是抑制早期分叉,培育高大干材的理想结构,阔叶树占20—40％。
The early bifurcation of Pinus koraiensis plantation is an important obstacle to cultivating high quality timber. Based on the survey data of 6686 Korean pine plantations (18-30 years old) in 68 plots, the following points are clarified: 1. The growth and development of most stands of Pinus koraiensis plantations in Yichun forest area are normal, with an average of Bifurcation rate of 20%, only 10% of the stand forks is serious. Therefore, it is possible to cultivate korean pine with tall dry material. 2. The main cause of the early bifurcation of Pinus koraiensis is mainly the damage of Pissodes hitidus Roelofs, accounting for 60% of the bifurcation number and 12.5% of the stubble and seed-picking damage. 3. The best way to inhibit early bifurcation is to maintain a reasonable stand structure. The natural broad-leaved Korean pine plantation, especially the broadleaved-Korean pine forest is the ideal structure to inhibit the early bifurcation and to grow tall dry wood , Broad-leaved trees account for 20-40%.