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本文对美洲黑杨15个南方地理种源进行了种源—子代测定。5年试验结果表明,不同地理种源对树高、胸径和树干通直度的总变异分别占64％、21％。同一种源的不同林分对树高、胸径和通直度总变异无显著影响。树高、胸径和通直度随着种源经度由东向西而增大,但随着种源纬度由北向南,只有树高生长相应增大。各性状的狭义遗传力较低,由于非加性方差很小,广义遗传力仅略大于狭义遗传力。通过种源—子代测定而建立的插穗生产区,树高和胸径的遗传增益比实生种子园高6～7％;树于通直度的遗传增益比实生种子园高2％。树高与胸径之间的遗传相关高达0.9以上,而树干通直度与树高或胸径的相关性很小(0.01～0.31)。
In this paper, the provenance-progeny determination of 15 southern geographic provenances in Populus tomentosa was carried out. The results of 5 years showed that the total variation of tree height, DBH and trunk straightness of different geographic provenances accounted for 64% and 21% respectively. Different stands of the same source had no significant effect on the total variation of tree height, DBH and straightness. Tree height, DBH and straightness increased with the longitude of the provenance increasing from east to west, but only the tree height increased correspondingly with the latitude of provenance from north to south. Narrow sense of traits of each trait is low, due to the small non-additive variance, generalized heritability is only slightly larger than the narrow heritability. The genetic gain of tree height and DBH was 6 ~ 7% higher than that of seedling seedlings established by sowing-offspring determination. The genetic gain of tree-straightness was 2% higher than that of seedling seedling. The genetic correlation between tree height and DBH was as high as 0.9, but the correlation between tree trunk straightness and tree height or DBH was very small (0.01-0.31).