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我县自1976年从南京林产工业学院引入少量72、69杨类插穗,78年冬又从江苏省泗阳县、仪征县引来5万株,在我县生长表现较好,尤其72、69、45杨三个无性系特别速生,年胸径生长量达4—8厘米,树高生长量达2.7—3.9米。但在育苗、造林方面,由于有些单位按一般杨类对待,结果出苗率不高,造林成活率低。为此,我局召集全县林业技术人员作了专题讨论,大家根据大量试验、调查,初步总结出一些经验,现将讨论结果归纳如下:
My county since 1976 from the Nanjing Institute of Forestry introduced a small amount of 72,69 young cuttings, 78 winter and from Siyang County, Jiangsu Province, Yizheng County attracted 50,000, growing well in our county, in particular, 72,69 , 45 Young three clones special fast-growing, diameter growth of 4-8 centimeters diameter, tree height growth of 2.7-3.9 meters. However, in raising nurseries and afforestation areas, some units are treated as normal Yangs, resulting in low emergence rate and low afforestation survival rate. To this end, I convened the county forestry technical personnel made a special discussion, we based on a large number of tests, surveys, preliminary summary of some of the experience, the results of the discussion summarized as follows: