<正>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。

There were vast genetic foundation for basic density (BD), fiber length (FL) and microfibril angle (MFA) in 1-69 poplar x Simon poplar and 1-69 poplar x Nigra poplar F1 clones, and the relationships among the three wood characters were independent, which indicated that it would be possible to select the genotypes with good wood properties that was big in BD, long in FL, close in the rang of microfibril. The variation pattern of wood characters within tree revealed the utilization rate of tree stem. BD was a falling-off in the horizontal change, which was considered as ideal type, FL increased with growth ring and the means of FL reached the standard of medium fiber length stipulated by the International Association of Wood Anatomists, MFA decreased gradually from pith to bark. The variation of the three wood characters in perpendicular direction could not make great influence on vertical utilization rate of tree stem.