毛白杨为我国特有的杨树,分布广,生长快,材质好,寿命长,可成大材,栽培历史悠久,是华北平原地区绿化的重要树种。毛白杨系杂种起源,在长期系统生育过程中,发生了很多变异,形成了不少类型。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,研究毛白杨类型,选择和推广其中良种,是提高毛白杨的产量和质量,实现毛白杨造林良种化的重要途径。近年来,在学习、总结群众经验的基础上,我们与河南洛阳地区林科所等兄弟 Populus tomentosa is unique to our country poplar, widely distributed, fast growth, good material, long life, can be a large timber, cultivation has a long history, is an important species of North China plains greening. Populus tomentosa hybrid origin, in the long-term systematic birth process, a lot of variation has taken place, formed a lot of types. According to Chairman Mao’s teaching that “with excellent varieties, that is, without more labor and fertilizers, more harvests can be obtained”, studying the types of Populus tomentosa and selecting and popularizing them is to increase the yield and quality of Populus tomentosa, An important way for afforestation. In recent years, on the basis of studying and summarizing the experiences of the masses, we and other brothers in Luoyang, Henan Province,