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扦插繁殖是毛白杨(Populustomentosa Carr.)快速育苗的主要方法之一。毛白杨属扦插难生根的树种,多年来,其扦插育苗技术一直受到各方面的重视,至今北方地区仍在研究解决如何提高毛白杨扦插育苗成活率的问题。以往毛白杨扦插育苗多采用硬枝扦插,通过物理或化学的方法对插穗进行处理,能促进插穗生根和提高扦插成活率,但硬枝扦插每年只进行一次,其繁殖系数尚不高。本试验采用组培1 年生毛白杨萌发出的大量侧枝作插穗,在全光自动喷雾条件下进行带叶嫩枝扦插,收到良好的效果。插穗来源丰富,生根快,育苗周期短,生根成苗率高,一年能进行多次扦插,繁殖系数高。所以我们认为,嫩枝全光雾插是毛白杨扦插快速育苗的一个新途径。
Cutting propagation is one of the main methods of rapid nursery of populus tomentosa Carr. Populus tomentosa is a hard-rooted tree species for cuttings. For many years, its cuttage seedling technology has been valued by all aspects. Up to now, northern poplar is still studying how to improve the survival rate of Populus tomentosa cuttings. In the past Populus tomentosus cutting seedlings to use more hardwood cutting, physical or chemical methods to cuttings, can promote cuttings rooting and improve the survival rate of cuttings, but the hardwood cuttings only once a year, the reproductive coefficient is not high. In this study, a large number of lateral branches of 1-year-old Populus tomentosa tissue culture for cuttings, in the all-optical automatic spray with softwood cuttings, received good results. Cuttings rich in origin, rapid rooting, seedling cycle is short, high rooting rate of seedlings, many times a year to cuttings, breeding coefficient. Therefore, we think that the twig shoots are the new way of rapid propagation of Populus tomentosa cuttings.