杨树是我盟营造防护林、固沙林及用材林的主要树种之一。在冲积平原营造农防林或用材林时,一般多在春、秋两季栽植截干根苗,或用卧干、插木造林,均可获得较高的成活率。近几年,随着林业事业的发展,造林地大面积的向沙地扩展,造林方法广泛地采用深开沟栽植一年生全株苗,并取得成功。但对开沟造林适宜季节的选定,各地不 Poplar is one of the main tree species for our league in creating shelterbelts, sand-fixing forests and timber forests. In the alluvial plain to create anti-forest or timber forest, usually more in the spring and autumn planting truncated stem seedlings, or use dry, wood planting, can get a higher survival rate. In recent years, with the development of forestry, large areas of afforestation land have been expanded to sands, and afforestation methods have been widely used to plant annual plantlets through deep open ditches and achieved success. However, suitable for the ditch afforestation season selected, not around