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一、引言杨树是我盟造林主要树种,但原有品种远远不能适应林业发展需要,为此,我所从1961年开始开展了杨树良种选育繁殖工作,重点选育适宜我盟自然特点的杨树新品种。十几年来通过引种、选种、育种等途径,搜集杨树种类334个,开辟栽培试验点27处,杨树造林试验面积3万亩,建立良种繁殖推广点32处,繁殖推广杨树良种种条10亿多株。目前全盟20多万亩的农田防护林基本上采用了杨树新品种,四旁绿化8744万株,70％为杨
I. INTRODUCTION Poplar is the main tree species of afforestation in our union, but the original varieties are far from being able to meet the needs of forestry development. To this end, we started the breeding and breeding of poplar seeds from 1961, Characteristics of poplar new varieties. Over the past decade, 334 species of poplar trees were collected and 27 cultivation and cultivation sites were popularized through the methods of introduction, seed selection and breeding, the area of poplar afforestation was 30,000 mu, establishment of breeding and propagation points for breeding was 32, Article more than 1 billion strains. At present, more than 20 million mu of farmland shelterbelt basically use new varieties of poplar. There are 87.44 million trees on the four sides and 70%