杨树为农田防护林、用材林主要树种。加强杨树修剪对于促进生长、提高出材率,有重要的意义。一、整形第1年后,修去与主枝竞争的侧枝及病枝、弱枝、有机械损伤的侧枝;第2、第3年修去粗大的竞争枝,修去少数下部侧枝;每4年以后反复修枝,直到形成6米的光洁干材。杨树 Poplar for farmland shelterbelt, timber forest main tree species. Strengthening poplar pruning to promote growth, increase the yield rate, there is an important significance. First, after the first year of plastic surgery, repair the branches and diseased branches that are competing with the main branches, the weak branches and the branches with mechanical damage; the second and third years repair the thick competition branches and repair a few lower branches; and every 4 After years of pruning, until the formation of 6 meters of bright dry material. Poplar