杨树是我国平原绿化主要树种之一,自20世纪80年代以来,林业科研单位经过多年研究,选育出一大批白杨派优良无性系。为实现优中选优、适地适树的研究目标,1990 -1993年,先后从大专院校和科研单位引进15个白杨派优良无性系, 以易县雌株作为对照,于1994年3 月开始在魏县苗圃场定植建立无性系对比试验林。现将进行11年的试验研究结果,简报如下。 Poplar is one of the main tree species in plain plains in our country. Since the 1980s, after many years of research, the forestry research institute has bred a large number of excellent clones of Populus. In order to realize the research goal of optimal selection of excellent and moderate tree, from 1990 to 1993, 15 Poplar fine clones were successively introduced from universities and research institutes, and the female plants of Yixian County were taken as the reference to start from March 1994 Weixian nursery field colonization set up climax comparison test forest. Now 11 years of experimental research results, the briefing is as follows.