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Contributions of different land cover types in Otindag Sandy Land and Bashang area of Hebei Province to the material source of sand stormy weather in Beijing

查看全文 作　　者：LIU Hongyan, TIAN Yuhong & DING Deng Department of Ecology, College of Environmental Sciences, Peking University, Beijing 100871, China 高影响力作者 出　　处：《Chinese Science Bulletin》索引2003年第48卷第17期,共4页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Grant No.40171097);Beijing Municipal Natural Science Foundation(Grant No.6022010). 摘　　要：Different land cover types in Otindag Sandy Land and Bashang area of Hebei Province are linked to a material source of sand stormy weather in Beijing based on results of field vegetation and soil survey and laboratory works. Results of grain size analysis show that dust release potential in per unit area of moving sandy land is small, while lowland meadow and meadow steppe in stony hills have high potential of releasing dusts in per unit area during sand stormy weather occurrence. Further considering the effects of vegetation, it is inferred that the moving sandy land served as a material source of past dust storm and the possi-bility of dust release in per unit area is low in current time. Typical steppe in stony hills is undergoing desertification and its dust release possibility in per unit area is high. Farmland has strong potential of release dusts when they are ploughed in spring, but a large amount of therophytes grow and thus prevent dusts from release when cultivation was terminated. Potentials of dust release in per unit area in fixed sand dunes, stony mountain meadow steppe and lowland meadow are low due to high cover of perennials. Sand dune reactivation and desiccation of lakes and lowlands under estimated future climatic change will make them serve as a future material source of sand stormy weather. 关 键 词：河北 北京 沙暴 土地覆盖 砂地 坝上地区 材料源
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