杨树是我省西部地区营造防护林、用材林和“四旁”绿化的主要树种.它具有易繁殖、易成活、适应性强、生长迅速的特点.对加速我省绿化进程,改变自然面貌,护田增产,建设商品粮基地等方面都起到了积极作用.但是,由于各种不利条件的影响形成了“小老树”.据在绥化、嫩江地区的十个县十处林场和七个公社的调查,当前“小老树”的现状是:分布广,面积大,长势差,生长量低.有树不成材,有材不能用.为 Poplar is the western region of our province to create shelterbelts, timber forests and “four sides” greening of the main tree species. It has the characteristics of easy reproduction, easy survival, adaptability, rapid growth. Accelerate the process of greening in our province to change the natural landscape, Increase production and build commodity grain bases, etc. However, due to various unfavorable conditions, the formation of “small old trees.” According to the surveys of ten forest farms and seven communes in ten counties in Suihua and Nenjiang areas, The current status of “little old tree” is: wide distribution, large area, poor growth, low growth rate.