日本落叶松生长快、材质好、抗性强,是我省引种成功用于大面积造林的主要速生用材树种之一。为迅速提供良种,我们从1973年起营建日本落叶松种子园,1975年开始定植,连续三年,共定植嫁接母树苗3000余株,53个无性系,约150亩。定植后,普遍生长旺盛,枝叶繁茂,但百分之八十的嫁接母树苗出观不同程度的歪干偏冠观象,严重地 Rapid growth of Japanese larch, good material, strong resistance, is the introduction of the success of our province for large-scale afforestation one of the main fast-growing timber species. In order to provide good seed quickly, we started to build Japan Larch Seed Orchard in 1973 and began planting in 1975. For three consecutive years, we planted more than 3,000 grafted seedlings and 53 clones of about 150 mu. After planting, the general growth is vigorous, lush foliage, but 80 percent of the grafted mother tree seedlings appear to varying degrees of skewed crowned crowns, seriously