我国内陆沙地面积较大,据调查,仅河北省就有220万亩左右。杨树是我国北方沙地造林的主要树种之一。但近些年来,干旱沙地杨树造林,大多成活率(保存率)很低,幼龄林质量状态不高,生长缓慢,形成“小老树”。 造成此种状况的原因是多方面的,其中主 Our country has a large area of ​​inland sandy land. According to the survey, there are only about 2.2 million mu in Hebei Province. Poplar is one of the main tree species afforestation in the sandy land of northern China. However, in recent years, the survival rate of poplar trees in arid sandlands is very low (the preservation rate), and the young trees are of poor quality and slow growth, forming “small old trees.” The reason for such a situation is multifaceted, in which the Lord