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山杨是东北林区次生林中的主要树种，其生长较快，材质优良，是制造胶合板、纸浆等的重要原料，受到人们的重视。但现存山杨林分大都是因山杨根蘖繁殖而形成的天然林，人工育苗造林成功率一直很低。据观察：山杨实生苗造林后一个月其主要根系（主根、主要侧根）伤口部位开始愈?
Populus euphratica is the main tree species in the secondary forest in the northeastern forest. Its rapid growth and good material make it an important raw material for the manufacture of plywood and pulp, which attracts people’s attention. However, most of the existing aspen forests are natural forests formed by the breeding of Asparagus officinalis. The success rate of artificial afforestation has been very low. It is observed: aspen seedlings afforestation a month after the main root system (main root, the main lateral root) the wound site more?