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按生长性状预选出毛白杨１３年生１０个无性系（另２个作对照）用于材质测定。试材取自北京大兴县测定林，每无性系在３个重复中各抽样１株，伐倒取样。分析表明，毛白杨无性系间纤维长度、宽度和长宽比差异极显著，重复率依次为０．７７７、０．５３７和０．６７６；木材全年密度、早材密度和晚材密度差异极显著，重复率依次为０．５３６、０．５１４和０．４２９。毛白杨无性系纤维长（ＹＬ）随树龄ｔ增长呈指数曲线生长模型：ＹＬ＝７．１９５５ｅ－０．８３６９（ｔ－１）；全年密度（ＹＤ）随树龄ｔ增长呈波动生长模型：ＹＤ＝０．５０５３＋０．０００６７ｔ。无性系材积生长量与木材密度、纤维长度之间呈独立遗传。经过材积生长量、木材全年密度、纤维长度、主干通直度性状经济权重分析和指数选择，为北京点选出８个优良无性系，平均综合育种增益达２０％以上。同时，评选出河北、河南２个地点的优良无性系。
According to the growth traits pre-selected Populus tomentosa 13-year-old 10 clones (the other two as a control) for material determination. Specimens from Daxing County, Beijing measured Lin, each clone in three replicates of a strain, down sampling. The analysis showed that the differences of fiber length, width and aspect ratio among Populus tomentosa clones were extremely significant with the repetition rates of 0.777, 0.537 and 0.676, respectively; the annual difference of wood annual density, early wood density and late wood density Significantly, the repetition rates were 0.536, 0.514 and 0.429. Populus tomentosa clones with exponential curve growth model YL = 7.1955e-0.8369 (t-1); annual density (YD) fluctuating growth model with the growth of t age: YD = 0.5053 + 0.00067t. Clonal volume growth and wood density, fiber length between the independent genetic. After volume growth, annual density of wood, fiber length, economic weight analysis of trunk straightness traits and index selection, eight elite clones were selected in Beijing, and the average integrated breeding gain was over 20%. At the same time, selected clones in two locations of Hebei and Henan.