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通过调查,将甘肃省的河北杨(Populus hopeiensis Hu et Chow)划分为庆阳,平凉集中分布区和兰州、定西、临夏、天水散生分布区。查明全省计有河北杨28748亩,包括青皮型、灰皮型、疏冠型、密冠型四大生态变异类型。在此基础上,系统地进行了河北杨的选优、种源试验、杂交育种等良种选育工作,共选优树40株,建立河北杨基因库65亩。并应用组织培养的方法加大优良类型的繁殖系数,解决了河北杨扦插繁殖的技术问题,成活率达80％;在研究推广中将河北杨分布向南推移200公里,向西推移500公里,生长良好,同时还在基础研究方面就河北杨起源问题进行了探讨,推断河北杨为单中心起源的杂种无性系。
Through investigation, Populus hopeiensis Hu et Chow in Gansu Province is divided into Qingyang, Pingliang and Lanzhou, Dingxi, Linxia and Tianshui. It is found that there are 28,748 mu of Hebei Yang in the province, including four types of ecological variation, ie, green skin type, gray skin type, sparse crown type and dense crown type. On this basis, systematic selection of elite Yang, Hebei provenance breeding, hybrid breeding and other breeding work, a total of 40 trees were selected, to build 65 acres of Hebei Yang gene pool. And the application of tissue culture methods to increase the fine type of breeding coefficient, to solve the Hebei poplar cutting propagation of technical problems, the survival rate of 80%; Hebei poplar in the study and promotion of the distribution of 200 kilometers southward, 500 kilometers westward, Good growth, but also in basic research on the origin of Hebei Yang were discussed to infer that Hebei Yang as a single center of the origin of hybrid clones.