辽河杨 辽宁杨 盖杨在宁夏地区的引种试验

辽宁杨、辽河杨、盖扬三个品种于1997年引入宁夏中卫地区，在同一立地类型和同等抚育措施条件下，育苗、造林均表现出良好的适应性。育苗成活率、造林成活率与当地主要杨树品种新疆杨无明显差异，但生长量显著高于新疆杨；抗寒性能与新疆杨相当；虽和新疆杨一样易感染天牛虫害，但由于其速生性使天牛不能完成生活史而不至于造成危害。作为速生树种，在中及类似条件的地区具有良好的发展前景。

Research on the Introduction of Populus liaheniea P.liaoningensis and P.gaixianensis

Populus liaoningensis ,P. liaoheniea and P. gaixianensis were first introduced to Zhongwei county Ningxia province from Liaoning province in 1997. They showed excellent suitability under the same condition of physical feature and management. The survived rate of seeding and cultivating is not different from P. alba. The production is higher than P. alba. The hardiness and infection by Anoplophon grabripennis is as same as p. alba cv. These three varieties of trees are not suffered from Anoplophon grabripennis for it cannot survive in the trees. As fast -growing variety of trees they can be well spread to many area similar to Zhongwei.