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一、前言落叶松生长快,材质好,适应性强,是我省东部山区主要用材树种,但是,由于树种之间的差异,生长、抗性表现不同。我们试想利用当地生长的日本落叶松(Larixleptolepis)生长快,抗早期落叶病的特点,和抗病差的长白落叶松(Larix olgen-sis)杂交,期望双亲优良性状互补,培育出速生、抗病的新类型,确定日本落叶松为母本,长白落叶松为父本的有性杂交试验。一九七四年,一九七六年先后获得两批杂种苗。据苗期、幼树期调查,杂种具备抗寒、抗病、速生的特点(图片 A、B)。现把杂交方法和过程、苗木和幼树的主要性状、生长表现分析如下。
I. Introduction Larch grows fast, the material is good and the adaptability is strong. It is the main timber species in eastern mountainous areas of our province. However, due to the difference among tree species, the growth and the resistance are different. We tried to use the locally grown Larixleptolepis to grow faster and resist early-leaf deciduous disease and cross the poorly-tolerant Larix olgen-sis. We expect that both parents will have excellent traits and develop fast-growing and disease-resistant Of the new type, to determine the Japanese larch as the female parent, Larix olgensis as the male sexual hybridization experiment. In 1974, two batches of hybrid seedlings were obtained successively in 1976. According to seedling stage, sapling investigation, hybrids have the characteristics of cold, disease resistance, fast-growing (Photo A, B). Now hybridization methods and processes, the main characters of seedlings and saplings, growth performance analysis is as follows.