我国干旱地区面积很大,三北地区有很大一部分是属于这一类型.这类地区有林地少,荒山荒地多,干旱、风沙和水土流失危害十分严重.因此,这些地区造林更显重要,但又有相当大的困难,造林成活率往往较低.怎样才能提高北方干旱地区的造林成活率,是大家 Arid areas in our country are large in area, and a large part of the Three North areas belong to this type. These areas have less woodlands, more barren hills and wilderness, and serious damage from droughts, sandstorms and soil erosion. Therefore, afforestation in these areas is even more important, However, there are considerable difficulties and the survival rate of afforestation is often low. How can we improve the survival rate of afforestation in arid areas in the north?