THE SELECTION AND BREEDING NEW POPULUS EURAMERICANA CLONES-ZHONGBAO NO.28, ZHONGBAO NO.115, ZHONGBAO NO.95

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.