为了提高造林实际效果,必须从林木良种着手,才能达到速生、丰产、优质的目的,为国家又多又快的提供木材。我省四旁绿化树种以杨树居多,而四旁绿化树木又是民用材自给的保障,因此杨树的引种选育工作在我省有着极其重要的意义。杨树的引种选育工作已越来越为林业生产单位和社、队林场所重视,群众性的引种选育工作日益蓬勃开展。1933年箭杆杨由陕西引入我省,解放后由河北引入加拿大杨,1958 In order to improve the actual afforestation effect, we must start from the forest seed to achieve fast-growing, high yield, high-quality purposes, for the country to provide more and faster wood. Greening trees on the four sides of the province are mostly poplar trees, and greening trees on four sides are the guarantee of self-supply of civil timber. Therefore, the introduction and breeding of poplar trees is of great significance in our province. The introduction and breeding of poplar has become more and more important for forestry production units, clubs and forestry places, and the popularization and breeding of populace has been increasingly carried out. In 1933, Arrowhead was introduced into Shaanxi Province by Shaanxi Province. After liberation, Hebei Province was introduced into Canada by Yang, 1958