二白杨又叫青白杨,是我省河西走廊主要的一个乡土树种,它具有生长迅速,材质优良,抗旱、耐盐等优良性状,是群众深为喜爱的造林和四傍绿化树种。一、形态特征和分布地区乔木,高25米左右,侧枝斜上伸展,与主干成35—45度的夹角,第一、二级侧枝均粗壮,较稀疏;树冠长圆形,例圆卵形或窄卵形,约占全树高的1/2—1/3。幼龄树皮光滑, Poplar, also known as Poplar, is a major native tree species in the Hexi corridor of our province. It has the characteristics of rapid growth, good material, drought resistance and salt tolerance. It is afforestation and Simpang afforestation species deeply loved by the masses. First, the morphological characteristics and distribution of arbors, about 25 meters high, side branches obliquely stretched, and the backbone of the angle of 35-45 degrees, the first and second side branches are thick, more sparse; crown oblong, case of round eggs Shaped or narrowly ovate, accounting for 1 / 2-1 / 3 of the whole tree height. Young bark smooth,