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1972年,我国从意大利引进6个杨树新品种。1977年在江苏北部泗阳县引种试栽首创成功,各地纷纷引种,特别是江汉平原、江淮平原和长江下游一带,扩大了杨树栽培区,促进了平原绿化的发展。但是,在国外杨树引种中还存在着一些问题:种源不清,名称混乱,盲目引种,对新品种基本特性缺少了解,因而不能发挥良种优势与增产潜力。产生这些问题的原因,主要是对新品种原产地的自然条件不熟悉,对它们的形态、生态、生长、抗性和木材特性等方面技术资料还缺少了解。为此现将实地考察所得的资料,简介如下,供各地参考。一、原产地自然条件概况
In 1972, China imported 6 new poplar varieties from Italy. In 1977, the trial planting planted in Siyang County, northern Jiangsu Province was first successful. Various places were introduced, especially the Jianghan Plain, the Jianghuai Plain and the lower reaches of the Yangtze River. Poplar cultivation areas were expanded and the plains greening was promoted. However, there are still some problems in the introduction of poplar abroad: proven species, confusion of names, blind introduction, and lack of understanding of the basic characteristics of new varieties, thus failing to exert the superiority of seed and yield-increasing potential. The causes of these problems are mainly unfamiliar to the natural conditions of the origin of the new varieties and their lack of understanding of the technical data on morphology, ecology, growth, resistance and wood properties. For this reason, the information obtained from field visits is as follows for reference. First, the natural conditions of origin profile