近年来,一场场沙尘暴席卷北京,老舍先生笔下老北京城被黄沙笼罩的景象又重现在人们面前。沙尘暴引起了全国各级领导及生态学家们的注意。据调查沙尘暴很可能与目前我国大面积的草场沙化有关。草原不仅是牧民生存之本,它在生态系统中所起的作用也是不容我们忽视的。一片结构合理的草地生态系统在防风固沙、防止水土流失等方面的作用并不亚于茂密的森林生态系统。草地的生态作用如此之重,我们却不能把它全部围封,因为那些世世代代 In recent years, a scene of dust storms swept Beijing, Lao She wrote the old Beijing city was shrouded in yellow sand scene again in front of people. Sandstorms have drawn the attention of leaders and ecologists all over the country. According to the survey, sandstorms are probably related to the desertification of large-scale pastures in our country at present. Grasslands are not only the basis for the herdsmen’s survival, but also their role in the ecosystem. We should not neglect them. A well-structured grassland ecosystem plays no less than a lush forest ecosystem in terms of windbreak and sand fixation and soil erosion prevention. The ecological role of grass is so great that we can not enclose it all because of those generations