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采用什么等级的杨树苗木造林，在不同国家和地区有很大差异。其原因既有传统习惯问题，也有因自然条件或无性系特性不同而得出的结论。本试验目的是为了确定欧美杨（奈瓦）和欧美杨１—７２两个无性系，３～４个苗木等级，在淮北市粉煤灰复垦地上，造林后４年间的生长表现。结果表明，用欧美杨（奈瓦）大苗造林（２／３或１／２苗）有明显的缓苗现象；用小苗造林（１／１笛），到第２年末，便消除了与大苗林木的高、粗生长差异。用不同等级的１—７２杨苗木造林，缓苗情况差异不大，因此，用大苗造林的林木生长量到第４年仍然领先于用小苗造林的生长量。
What level of poplar seedlings afforestation, in different countries and regions are very different. The reason is not only the traditional habit, but also the result of different natural conditions or clones. The purpose of this experiment is to determine the growth performance of Populus na (Niwa) in Europe and America and two clones of Populus 1-72 in the United States, 3-4 seedling grades on the ground of fly ash reclamation in Huaibei City and the 4 years after afforestation. The results showed that the afforestation (2/3 or 1/2 seedlings) of Populus eucholdiana (Niwa) seedlings had obvious Huanmiao phenomenon; with afforestation (1/1 flute) of seedlings, by the end of the second year, High, coarse growth differences. With different grades of 1-72 poplar seedlings afforestation, Huanmiao little difference, therefore, the growth of trees with large seedlings afforestation in the fourth year is still ahead of the growth of afforestation with seedlings.