杨树是生长迅速、适应能力强、木材用途广及栽培繁殖技术比较容易的树种,是“绿化祖国”,加速祖国社会主义建设的优秀树种之一。目前,我国北方各省(区)、市林业及城市园林部门对杨树栽培都非常重视。为了寻求适应性强而速生优质的杨树,各地广泛开展了大规模的引种和选育工作。但因杨树种类很多,栽培历史较久,并已经选育出不少的人工杂种和自然杂种,目前已知全世界野生的自然种 Poplar is a species of tree that grows rapidly, has strong adaptability, wide use of wood and cultivation and propagation techniques, and is one of the excellent tree species for “greening the motherland” and accelerating the socialist construction in the motherland. At present, the forestry and urban landscape departments in the provinces (autonomous regions) and municipalities of northern China attach great importance to poplar cultivation. In order to seek adaptable and fast-growing high-quality poplar, large-scale introduction and breeding work has been widely carried out. However, due to many types of poplar, cultivation history longer, and have bred a lot of artificial hybrids and natural hybrids, is now known to the wild natural species