在全疆造林中,杨、柳树所占比例较大。这两种树种大都采用无性繁殖,具有根系浅,早衰等弱点,且树木干梢严重。究其枯萎、干梢的原因,常言道不外乎是因抚育管理不善。如灌水不当、旱涝不均、病虫为害、修枝不当等而引起。但另一个重要原因不能不引起,注意,这就是苗木长期用扦插繁 Afforestation in Xinjiang, Yang, Willow a larger proportion. Most of the two species use asexual reproduction, with the root system of shallow, premature aging and other weaknesses, and serious dry stems. Investigate its withering, dry tip of the reason, often say nothing more than because of poor management of tending. Such as improper irrigation, uneven droughts, pests, pruning, etc. caused by improper. But another important reason can not be caused, note that this is the long-term nursery stock cuttings