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通过对三倍体山扬苗期形态特征及生长节律的观测，发现该品种干形通直，分枝角度小，可提高林地生产力；其苗高、地径生长迅速，年均生长量分别为1．87m、1．77cm，是优良的山地造林树种；苗高、地径生长量的大小与气象因于密切相关，自6月中旬开始；随温度的升高，苗高生长逐渐增高，7月上旬达到高峰，之后随温度升高苗高生长呈下降趋势，地径生长较平稳；当8月上旬温度、降水达到高峰时，地径生长达到高峰，高生长缓慢，一些苗木受高温影响而封顶。
Through the observation of the morphological characteristics and growth rhythm of triploid poplar seedlings, it was found that the variety was dry and straight with small branching angle, which could improve the productivity of woodland. The seedling height and diameter of the seedling grew rapidly and the average annual growth was 1.87m and 1.77cm, respectively. They are excellent afforestation species in mountainous areas. The growth of seedling height and diameter are closely related with the weather, and begin to be from mid-June. With the increase of temperature, the growth of seedling height is gradually increased. When the temperature reached the peak in early August, the diameter growth peaked, the height growth slowed down, and some seedlings were affected by high temperature. When the precipitation peaked in early August, Capped.