杨树壮苗对造林成活率和幼林生长有重要作用。但在生产中,培育和使用杨树壮苗常被忽视,即使营造杨树速生丰产林往往也没有使用壮苗。目前,杨树育苗普遍存在密度过大、出圃苗木瘦弱等问题。用低质苗木造林对林术生长造成的影响是长远的,然而人们却往往觉察不到由此而造成的损失。意大利和法国等欧洲国家重视用杨树壮苗造林。在意大利用2年生苗造林,苗木分级标 Strong seedlings of poplar afforestation survival rate and young forest growth has an important role. However, in the production, cultivation and use of poplar seedlings are often overlooked, even if it is often used to create poplar fast-growing high-yielding seedlings. At present, poplar nursery widespread over-density, nursery stocky thin and other issues. The impact of afforestation with low-quality seedlings on the growth of forestry is long-term, yet people often fail to detect the resulting losses. Italy and France and other European countries attach importance to afforestation with poplar seedlings. In Italy with 2-year-old seedlings afforestation, seedling grading