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经过９ａ的比较试验，从３７１个毛的杨无性系中选出５个优良无性系。对５个无性系生长性状、生物量、叶的净光合速率、光能利用率等进行了研究分析。结果表明：当选无性系７ａ生树高、胸径、材积生长比对照分别提高２５％～３７％，１０８．７％～１４１．３％，４３２％～５７８％，林分单位面积生物量、叶的净光合速率、光能利用率比对照分别提高１１９．８％～５０７．２％，２０．８％～６７．０％，２１９．８％～５３７．６％；中选系号有较强的适应性，在ｐＨ８～８．５的条件下，生长良好，仍表现出早期速生的特性，说明入选无性系均有较高生产力和早期速生特性，可在生产中推广应用。
After 9 years of comparative experiments, we selected 5 elite clones from 371 hairy poplar clones. Five clonal growth traits, biomass, net photosynthetic rate of leaves, light energy utilization rate were studied and analyzed. The results showed that the tree height, DBH and volume growth of the selected clones were increased by 25% -37%, 108.7% -141.3% and 432% -578%, respectively. The biomass per unit area, Net photosynthetic rate and light utilization rate increased by 119.8% -507.2%, 20.8% -67.0% and 219.8% -53.76% respectively compared with the control. The middle selection system had strong adaptability It grows well under the conditions of pH8 ~ 8.5, and still shows the characteristics of early rapid growth. It indicates that the selected clones have higher productivity and early fast-growing characteristics and can be popularized and applied in production.