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1977年,汉寿县林科所引进黑杨派六个无性系,经过栽培试验,从中选出了适于南方生长的三个品种,即欧美杨72P.Xeuramericana cvsan martino I-72/58;美洲黑杨63 P.beltolbes cv H＇arvard I-63/51;美洲黑杨69 P.belto-lbes cv lux I-69/55。三个品种目前已扩大到秦岭淮河一线以南的湿润亚热带平原地区,充分显示了良种优势。但随着杨树的发展,如何从本地区的自然条件和经济目标出发,研究各
In 1977, Hanshou County Branch of the introduction of black climber cloning, after cultivation experiments, selected from the three species suitable for the growth of the South, that is, Europe and the United States Yang 72P.Xeuramericana cvsan martinoI-72/58; Americas Populus 63 P.beltolbes cv H’arvard I-63/51; Populus nigra 69 P.belto-lbes cv lux I-69/55. The three varieties have now been expanded to wet subtropical plains south of the Huaihe River in Qinling, which shows the superiority of seed. However, with the development of poplar, how to proceed from the natural conditions and economic goals of the region,