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为了探讨单交种、三交种的杂种优势及多次杂交的成效,以便更好地利用杂种优势,对林口县青山林场14年生杂种落叶松子代测定林进行了分析。结果表明:落叶松杂种具有明显的杂种优势,12个三交种家系材积平均值分别超过亲本31.8%,超过长白落叶松种子园41.2%,超过小北湖种源214.8%;4个单交种材积平均值分别超过亲本31.4%,超过长白落叶松种子园44.6%,超过小北湖种源222.5%。单交种与三交种生长性状差异不显著:落叶松亲本、单交种以及三交种树高、胸径及材积生长量间差异显著,其中单交种与亲本间差异显著,而与三交种生长量间差异不显著。不同组合表现不同,日12×兴9组三交种高生长较好,日5×兴9组单交种高生长较好,兴7×日77-2组单交与三交种胸径、树高及材积差异均不显著。
In order to explore the heterosis of single cross and triple cross and the effect of multiple crossbreeding in order to make better use of heterosis, the 14-year-old hybrid larch progeny test forest in Qingshan Forest Farm of Linkou County was analyzed. The results showed that the larch hybrids had obvious heterosis. The average of the 12 triosial families exceeded that of the parents by 31.8%, exceeding 41.2% of the Larix principis-rupprechtii seedlings and 214.8% The average values exceeded 31.4% of the parents respectively, exceeding 44.6% of Changbai larch seed orchard, exceeding 222.5% of Xiaobeihu provenance. There was no significant difference in the growth traits among the single cross and the triple cross: the differences were significant among the larch parents, the single cross and the three crossings, the tree height, DBH and volume growth were significant There was no significant difference between the growth of species. The performance of different combinations was different. The growth of the three crossings of 12 × Xing 9 was better, and the growth of single crosses of 5 × Xing 9 was better. The DBH High and volume differences are not significant.