20 0 0年 3— 5月北方发生了 13次沙尘暴 ,使人们谈沙色变 ,记忆犹新 ,认识到北京及其周边地区的生态环境在恶化。沙尘暴是现有的水土流失 ,是严重的水土流失 ,是植被破坏后造成的恶果 ,是与滑坡、崩塌、泥石流类似的生态灾难。河北省张家口和承德是沙尘的主要沙源地 ,治理好该地区的水土流失 ,对实现其可持续发展至关重要 From March to May 2000, there were 13 dust storms in the north, reminding people of the changes in color and remembered that the ecological environment in Beijing and its surrounding areas is deteriorating. Dust storms are the existing soil and water loss, which are serious soil erosion and soil erosion. They are the result of vegetation destruction and ecological disaster similar to landslides, landslides and mudslides. Zhangjiakou, Hebei Province and Chengde are the main sources of sand and dust, and harnessing the soil and water loss in the area is crucial to realizing their sustainable development