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一、前言美洲黑杨(Populus deltoides Marsh.)天然分布于北美,是北美的一个重要的杨树种,在世界各国的杨树栽培中也占有重要地位。近三十年来,意大利、英国、比利时、荷兰、新西兰、阿根廷、澳大利亚等国都引种美洲黑杨,并从中选择优良无性系,应用于生产。美洲黑杨又是杂交育种的重要亲本之一,由美洲黑杨与其它杨树杂交育成的优良品种颇多,除著名的欧美杨类外,还有美洲黑杨与青杨派树种的杂交种格氏杨
I. Introduction Populus deltoides Marsh. Naturally distributed in North America, Populus deltoides Marsh. Is an important poplar species in North America and plays an important role in poplar cultivation throughout the world. Nearly three decades, the United States, Italy, Britain, Belgium, the Netherlands, New Zealand, Argentina, Australia and other countries introduced black poplar, and choose from excellent Clones, used in production. American black poplar is one of the important parents of hybrid breeding. There are many fine varieties cultivated by the hybrid between Populus nigra and other poplar, besides the famous European and American poplar species, the hybrids of Populus nigra and Populus simonii Grignard Yang