一、引言呼伦贝尔草原位于我国东北疆域,自然资源丰富,是发展畜牧业生产的好地方。可是,近年来由于草原开垦面积逐渐扩大,出现了越来越严重的土壤风蚀,成了关系到草原建设的一个不可忽视的问题。呼伦贝尔草原自西向东分属中温带亚干旱和亚湿润气候,降水较少。特别是春季,不但干旱少雨,而且多刮大风,干燥、棵露的开垦地表层土壤很容易被风剥蚀,从而破坏了土壤结构,降低了土壤肥力,使土壤逐年砂化。这不仅直接破坏了开垦地的土质,而且流砂还 I. INTRODUCTION Hulunbuir grassland is located in the northeast of China and has abundant natural resources. It is a good place for the development of animal husbandry. However, due to the gradual expansion of grassland reclamation area in recent years, more and more soil wind erosion has emerged and become a problem that can not be ignored in the construction of grassland. Hulunbuir grasslands from west to east belonging to the temperate sub-arid and humid climate, less precipitation. Especially in spring, not only arid and little rain, but also more windy, dry, exposed dew of cultivated land surface soil is easily denuded by wind, thus undermining the soil structure, reducing soil fertility and soil sanding year by year. This not only directly undermines the quality of reclaimed land, but also flows the sand to return