毛白杨(populus tomentosa Carr.)是我国特有的杨树,分布广,栽培历史悠久,经验丰富;同时,生长快,寿命长,干大、材优,在我国华北平原地区“实行大地园林化”和发展纤维工业具有重要的作用。毛白杨系杂种起源,在长期系统生育过程中,由于立地条件和人工选择、培育的结果,使它发生了很多的变异,产生了不少的新类群。遵照毛主席“有了优良品种,即不增加劳动力、肥料,也可获得较多的收成”的教导。研究毛白杨起源和分类,选择和推广其中良种, Populus tomentosa Carr. Is a poplar tree that is unique to our country. It is widely distributed and has a long history and rich experience in cultivation. At the same time, populus tomentosa Carr. Grows fast, has long life, And the development of fiber industry has an important role. Populus tomentosa hybrid origin, in the long-term systematic birth process, due to site conditions and artificial selection, training results, it has a lot of variation, resulting in a lot of new groups. In accordance with Chairman Mao’s “good varieties, that is, without increasing labor, fertilizer, but also get more harvest” teaching. To study the origin and classification of Populus tomentosa, select and popularize among them,