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落叶松适应性强,生长快,材质好,但因其种的不同表现在生长特点,材质和抗病力上有着一定差异。日本落叶松(Larix leptolepis)的特点是抗早期落叶病,初期生长迅速,材质稍软,往往树干基部有弯曲现象。长白落叶松(Larix olgensis)的特点是生长稳定,树干通直圆满,材质坚硬,易罹早期落叶病。因此,为培育出适应性强,速生性稳定,干形圆满,材质优良,具有抗病性强的落叶松新品种,我们于1972年开始进行日本落叶松和长白落叶松种间杂交及日本落叶松种内类型间的杂交试验。分别选择生长快、干形直、圆满、抗早期落叶病的日本落叶松15号树(以下简写日_((15))为母本,长白落叶松16号、17号树和日本落叶松4号、6号树为父本。杂交组合: 日_((15))×长_((16));日_((15))×日_((4)) 日_((15))×长_((17));日_((15))×日_((6)) 在草河口地区落叶松为4月20日前后,积温(从
Larch adaptability, fast growth, good material, but because of their different manifestations in the growth characteristics, material and disease resistance have some differences. Larch (Larix leptolepis) is characterized by resistance to early deciduous disease, the initial rapid growth, slightly softer material, tend to bend the base of the trunk phenomenon. Larix olgensis is characterized by its stable growth, straight trunk, hard material and early defoliation. Therefore, in order to cultivate new varieties of larch with strong adaptability, fast-growing stability, perfect stem, high quality and strong disease resistance, we started the interspecific hybridization between Japanese larch and Larix olgensis in 1972, Hybrids between pine types. Select the fast growth, dry straight, satisfactory, early deciduous disease resistant Larix kaempferi 15 tree (hereinafter abbreviated day _ ((15)) as the female parent, Larix olgensis 16, tree 17 and Japanese larch 4 No. 6 and tree as paternal line. Hybridization combination: day _ ((15) × length_ ((16)); day_ (15) × day_ (4) day_ ((15)) × (15) × day _ ((6)) The larch in the Caohekou area was around April 20, the accumulated temperature (from