关于河北杨无性繁殖生根较难的问题,我们认为是与河北杨先成不定根的形成和其数量的多少有着直接的关系。 截止目前,一些学者对不同树种的不定根作了大量的研究,如:柳属、葡萄、圆柏等,而对河北杨及其他杨树的不定根的形态与解剖方面的研究尚未见有报道。本文现就河北杨先成不定根的形成等有关问题作一些初浅的探讨。 About the asexual propagation of Hebei poplar root difficult problem, we think that is with Yang Xiancheng adventitious roots formation and the number of how many have a direct relationship. Up to now, some scholars have made a great deal of researches on adventitious roots of different tree species, such as Salix, Grape, Sabina and so on. However, there has been no report about the adventitious root morphology and anatomy of Hebei poplar and other poplars. This article is on Hebei Yang Xiancheng formation of adventitious roots and other related issues to make some primary discussion.