【摘要】 当前世界各国的杨树人工林中欧美杨占有重要位置。到目前为止,我国栽培的欧美杨品种全部从欧洲引进。为此,从1979年起,用速生的鲁克斯杨(I-69/55)为母本,以抗寒、窄冠的欧洲黑杨及其变种为父本,经过杂交、选择和无性系测试林的比较,选出了中保28、中保115和中保95三个欧美杨优良无性系。共同具有速生、优质、抗性强的特点:主干通直、圆满、侧枝细、顶端优势明显、易于繁殖;木材气干密度和基本密度都高于本地推广良种I-214(母本因气候条件不适而死亡),平均材积超过I—214杨 52.2—33.5％;其遗传增益分别为38.6％、31.1％和24.8％;耐寒性高于母本,对病虫害尤其对溃疡病有高度抗性。为我国培育了第一代欧美杨新无性系。现已在河南、山东、山西等地进行区域化试验。更多还原

【Abstract】 The purpose is to breed Chinese own fast-growing P. euramericana culti-vars. The program began from 1979, P. dehoides Bartr. cv. ’Lux’ (ex. I-69/55) as the mother tree, P. nigra and its variety with the characteristics of resistance to frigidity and narrow crown as the father tree. Based on the selection, hybridization and the comparison of clones test plantation, the three improved clones were finally selected. The common main characteristics of which are: fast-growing high quality, straight and round trunk, thin branch, obvious top dominance, easy regeneration, wood air dry density and specific gravity and higher than that of P. euramericana (Dode) Guinier CL I-214. It is representative cultivar of P. euramericana and cultivated widely in the world, the mother tree died owing to severe climate in central north of China, the average volume is 52.2-33.5% higher than that of I-214,the average genetic gains are 38.6%, 31.1% and24.8% respectively. Resistance to frigidity is higher than mother tree and strongly resistant to canker (Dophiorella gregaria), which is the first generation of improved P. euramericana’s clone bred in China. And now the regional trails are carried out in Henan, Shandong, Shanxi provinces ect.更多还原