疏伐是培育人工种子林(或称母树林)最基本的技术之一,也是最有成效的方法。为了探讨种子林的疏伐技术,我们在黑龙江省林口县青山林场做了调查。结果表明,1959年疏伐的人工落叶松种子林生长发育良好,并于1961年开始结实。1964年获得大丰收,仅17.6公顷就采集球果27300斤,调制出纯籽1006 Thinning is one of the most basic techniques for cultivating artificial seed forests (or mother trees) and is also the most effective method. In order to explore the thinning technology of seed forests, we did a survey in Qingshan Forest Farm, Linkou County, Heilongjiang Province. The results showed that in 1959 the thinning artificial Larix gmelinii seedling forest grew well and began to grow strong in 1961. Bumper harvest in 1964, only 17.6 hectares collected 27,300 pounds of cones, the modulation of pure seed 1006