<正> 我国自1972年引种黑杨派六个无性系[Populus deltoides Bartr.cv.‘Harvard’(ex.I-63/51),简称63杨,Populus deltoides Bartr.cv.‘Lux’(ex.I-69/55),简称69杨,Populusxeuramericana(Dode)Guinier cv.‘san Martino’(ex.I-72/58),简称72杨;Populusxeuramericana(Dode)Guinier cv.‘I-214’,简称214杨;Populus× euramericana(Dode)Guinier cv.‘I-45/51’,简称45杨,Populus nigra L.cv.‘blane de garonne’,简称加龙杨)以来,在江苏、浙江、山东、河南、江西、湖南和湖北等地先后获得成功。这些无性系生长迅速,表现良好。应当及时总结经验,用统一的标准来进行分析比较。

Heights and BHDs of 1-6 years old trees of six Aigeiros clones, namely Populus deltoides Bartr. cv. ’Harvard’, Populus deltoides Battr. cv. ’Lux’, Populus × eurame-ricana (Dode) Guinier cv. ’san Martino’, Populus × curamericana (Dode) cv. ’I-214’, Populus×euramericana (Dode) Guinier cv. ’I-45/51’ and Populus nigra L. cv. ’blane de garonne’, were measured. Results showed that the trees are growing well in Jiangsu, Zhejiang, Shandong, Henan, Jiangsi, Hunan and Hubei Provinces. A monomolecular growth model, Y=M(1-LeKA), was used in calculating the growth index and the lesult of calculation showed a close approximation to the actual growth of the trees. This method can be applied to the trees growing in the open or in sparse woods under various conditions,