太白杨(Populus purdomii Rehd)亦称冬瓜杨、波氏杨,属杨柳科、杨属,青杨派落叶乔木。模式标本采自太白山,为我国特有。本种为中低山区的主要造林树种,因树干高大、生长快、材质优良、寿命长,深受群众喜爱,素有“高山泡洞”之美称。一、分布与生境太白杨自然分布于陕西宁陕、凤县、眉县、留坝、佛坪等地;甘肃天水,舟曲以及河南、湖北、四川亦有分布。陕西秦岭为集中分布区,可能是该种的发源地和分布中心。垂直分布于海拔1000～2000米范围之间,常成小片纯林或与山杨形成混交林,也常散生于杂木林中。伴生的树种主要有:白桦、铁杉、华山松、椴树、灯台树、枫杨、山核桃、漆树、青麸杨及槭属多种植物;林下灌木主要有蔷薇、忍冬、小檗、栒子、荚 Populus purdomii Rehd also known as wax gourd poplar, Populus euphratica, willow families, Populus, Populus tomentosa deciduous trees. Specimens collected from Taibai Mountain, peculiar to our country. This species is the main afforestation tree species in the middle and low mountainous areas. Due to its tall trunk, fast growth, good material quality and long life, it is deeply loved by the masses and is known as “Alpine Bubble Hole”. First, the distribution and habitat Too natural distribution in Shaanxi Ning Shan, Feng County, Meixian, stay dam, Foping and other places; Gansu Tianshui, Zhouqu and Henan, Hubei, Sichuan also have distribution. Shaanxi Qinling as a concentrated distribution area, may be the birthplace of the species and distribution center. Vertically distributed in the range of 1000 to 2000 meters above sea level, often into small pieces of pure forest or aspen mixed with forest, often scattered in the mixed wood forest. Accompanying tree species are: birch, hemlock, Pinus armandi, lime tree, Itaewon tree, maple, pecan, tree, green bran and mapleA variety of plants; understory shrubs are mainly rose, honeysuckle, barberry, Shuttlecock, pods