Abstract Tree height and diameter at breast height of 30 half-sib Larix kaempferi families were analyzed at different ages. Analysis of variance revealed a significant difference in growth among different families. Phenotypic variation coefficients of the traits tree height and diameter at breast height among families of different ages ranged from 11.04 % to 31.74 % and 19.01 % to 19.83 %, respectively. Average heritability of tree height and diameter at breast height ranged from 0.87 to 0.96 and 0.93 to 0.96, respectively. Significant positive correlations were observed among all traits at different ages. By the method of multiple-traits comprehensive, six families (L18, L12, L8, L3, L25 and L20) were selected as being elite using a 20 % selection ratio at 12 years of age. Average values of these elite families were 11.15 % and 16.83 % higher than the total average for height and diameter at breast height, and genetic gains were 10.53 % and 15.79 %, respectively. Forty five elite individual plants were selected using a 5 % selection ratio which were 23.47 % and 24.90 % higher than the overall average for height and diameter at breast height, respectively.

中文翻译：

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半同胞落叶松家族生长性状的正向、反向选择及变异分析

摘要 对30个半同胞落叶松科不同龄期的树高和胸径进行了分析。方差分析表明，不同家庭之间的增长存在显着差异。不同年龄科间性状树高和胸径的表型变异系数分别为11.04%~31.74%和19.01%~19.83%。树高和胸高直径的平均遗传力分别为 0.87 至 0.96 和 0.93 至 0.96。在不同年龄的所有性状之间观察到显着的正相关。采用多性状综合法，在12岁时以20%的选择率将6个家系（L18、L12、L8、L3、L25和L20）选为精英。这些精英家庭的平均值分别为 11.15% 和 16。比胸高高度和直径的总平均值高 83%，遗传增益分别为 10.53% 和 15.79%。使用 5% 选择率选择了 45 株优良个体植物，它们分别比高度和胸高直径的总体平均值高 23.47% 和 24.90%。