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基本密度、纤维长度和微纤丝角在Ⅰ-69杨×小叶杨和Ⅰ-69杨×欧洲黑杨F_1无性系的测验群体中均具有广阔的遗传基础,并且相互之间的关系是独立的,表明选育一个密度大、纤维长、微纤丝排列紧密的优质材性基因型是可能的。木材性状株内变异模式揭示了树干利用率。基本密度水平变化呈“马鞍型”,是较理想的类型,纤维长度随年轮逐渐增大,平均纤维长度达到国际木材解剖学会规定的中级长度标准;微纤丝角从髓心到树皮是逐渐减小的。三个性状在垂直方向的变异对树干纵向利用率不会产生很大的影响。
The basic density, fiber length, and microfibril angle all have a broad genetic basis in the test population of I-69 Populus × Populus simonii and I-69 poplar × Populus nigra F_1 clones, and the relationships among them are independent , Indicating that it is possible to breed a high-quality material genotype with large density, long fiber length and close microfibril arrangement. Intra-plant variation patterns of wood traits revealed trunk utilization. The change of basic density level is “saddle type”, which is an ideal type. The fiber length increases gradually with the growth of annual rings, and the average fiber length reaches the intermediate length standard stipulated by the International Society of Timber Anatomy; Diminishing The vertical variation of the three traits will not have a significant impact on the vertical utilization rate of the trunk.