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本文对４个地点的毛白杨无性系进行了木材纤维长度遗传变异的研究．结果表明木材纤维长度在地点和无性系水平上均有显著的差异．木材纤维长度的无性系重复力估计为０．７９，表明这一材性性状受到较强的遗传控制，可以通过遗传手段得到改良．本文还研究了木材纤维长度在株内的遗传变异．木材纤维长度以及其它性状间的相关分析发现木材纤维长度和树木生长性状（包括材积、树高、胸径和树干通直度）之间均呈显著的正相关关系，但在木材纤维长度和木材基本密度之间存在显著的负相关关系．研究结论认为根据不同地点生长速率与材性的关系，可以进行以生长性状或木材材性性状为主的选择，也可以进行两方面的联合选择．
In this paper, the genetic variation of wood fiber length was studied in Populus tomentosa clones in four locations. The results show that there is a significant difference in wood fiber length at both clonal and clonal levels. The clonal reproducibility of wood fiber length was estimated to be 0.79, indicating that this trait was strongly controlled by genetic means and could be improved by genetic means. The paper also studied the genetic variation of wood fiber length in the plant. The correlation analysis between wood fiber length and other traits found that wood fiber length and tree growth traits (including volume, tree height, diameter at breast height and trunk straightness) showed a significant positive correlation between wood fiber length and wood basic There is a significant negative correlation between the density. The conclusion of the study is that according to the relationship between the growth rate and the material properties in different locations, the selection of growth traits or wood-based traits can be carried out, and the combination of two aspects can also be selected.