泡桐和沙兰杨是两种生长快、材质好,为群众喜欢的栽植树种。但是它们树皮较薄,质地松脆,受外伤后,树皮极易整块伤剥,尤其是树干基部的树皮易遭机械损伤,伤后木质部外露,不仅树木生长受到影响,雨水侵蚀后,木质部溃烂,造成空洞,降低材质,或者滋发病虫,严重时植株死亡,使造林前功尽弃。为了治愈树干皮 Paulownia and Sallans are two kinds of growing fast, good material, for the masses like planting trees. However, their bark is thin and the texture is crisp. After being traumatized, the bark is easily broken and stripped. In particular, the bark at the base of the trunk is easily damaged by mechanical damage. After the injury, the xylem is exposed. Not only the growth of the tree is affected, , Xylem ulceration, resulting in holes, reduce the material, or nourish pests, plants died in serious cases, so that afforestation and tried their best. To heal the trunk bark