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利用美洲黑杨(I 69杨)×欧美杨(I 45杨)33个F1 无性系第 12 年生数据详细研究了林木生长、木材品质和干形性状联合改良的可行性,并与单性状直接选择进行了比较。通过独立淘汰法可以选择出生长和材积均较优良的无性系;应用指数进行综合选择时,综合性状得到改良,但单个性状的遗传增益比单性状直接选择的增益有所下降;用材积和木材密度两性状构建的指数进行选择,选出的无性系是材积比较大、密度比较高的优良无性系,与独立淘汰法选出的无性系有66.7%是相同的;当用生长性状、木材品质性状和干形性状构建多性状选择指数时,材积经济权重×10 与密度经济权重×10 是两个比较好的指数;按材积经济权重×10进行选择时,虽然木材密度遗传增益很小,但是材积的遗传增益可达 5.14%,指数遗传力为 0.653 5;按照密度经济权重×10进行选择时木材密度可以获得 6.27%的遗传增益而材积几乎没有减少,指数遗传力高达0.702。运用选择指数对多性状进行综合评判和定向选择是切实可行的。
The 12th annual data of 33 F1 clones of poplar (I 69 Yang) × I Yang (I 45 Yang) were used to study the feasibility of the combination improvement of tree growth, wood quality and dry traits in detail. Compared. Through the independent elimination method, the clones with better growth and volume can be selected. When the comprehensive index is selected, the comprehensive characters are improved, but the genetic gain of individual traits is lower than that of the direct trait selection of single traits. Density of traits of two traits to choose to choose the clones selected is the volume of relatively large, relatively high density of clones, and independent selection of clonal 66.7% is the same; when using the growth traits, wood quality Traits and stem traits Constructed multi-trait selection index, the volume economic weight × 10 and density economic weight × 10 are two good indexes; when the economic weight of the volume × 10 is selected, though the genetic gain of wood density is small, The genetic gain of the product is up to 5.14%, and the heritability of index is 0.653 5. When density economic weight is selected as 10, the density of the wood can gain 6.27% of the genetic gain with little decrease of the volume, and the heritability of index is as high as 0.702. It is practicable to use the index of choice to conduct comprehensive evaluation and directional selection of multiple traits.