《杨树》运用了多种的说明方法。如引用说明:为了证明“杨树是我国最常见的树种之一”,作者引用了《齐民要术》和《三才图会》中的话。比喻说明:如说箭杆杨“俨然如道路两旁立正站岗的哨兵”。举例说明:说到“一些速生杨树新品种 Poplar uses a variety of instructions. Citation: In order to prove that “poplar is one of the most common tree species in our country,” the author cites the words “Qi Min Yao Shu” and “San Cai Tu Hui”. Analogy: If arrow Yang “as if standing on both sides of the road stand guard sentinel.” For example: Speaking of "some new varieties of poplar