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对四个产地11～13年生的樟子松优树子代林的早晚年—年秩次相关、表型和遗传相关统计分析结果表明,相关均极显著。其生长变异性在6～8年时已表现明显,且逐渐趋于稳定。樟子松优树子代林的早期选择可从7年生时开始,与25年生大树相关紧密。年选择率此时达最大。
The correlation between morning and evening year-year rank of Pinus sylvestris var.mongolica forest from 11 to 13 years in four places of origin was analyzed. The results of phenotypic and genetic correlation analysis showed that the correlation was extremely significant. Its growth variability in 6 to 8 years has been obvious, and gradually stabilized. Early selection of Pinus sylvestris var.mongolica can begin with a 7-year-old, closely related to a 25-year-old tree. Annual selection rate at this time up to.