| 黄土高原地区沙尘暴高发带的跃变现象 |
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| 引用本文： | 许炯心.黄土高原地区沙尘暴高发带的跃变现象[J].中国沙漠,2008,28(1):149-153. |
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| 作者姓名： | 许炯心 |
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| 作者单位： | 中国科学院地理科学与资源研究所/中国科学院陆地水循环及地表过程重点实验室, 北京 100101 |
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| 基金项目： | 中国科学院地理科学与资源研究所知识创新工程领域前沿项目（CXIOG-A04-08）;国家自然科学基金资助项目（40671019）共同资助 |
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| 摘 要： | 对黄土高原地区沙尘暴日数与年降水量关系的分析表明,在黄土高原地区存在着一个原生沙尘暴带和一个次生沙尘暴带,后者是人类破坏植被、改变土地覆盖状况的结果。发现原生沙尘暴带与次生沙尘暴带之间存在着跃变现象,这一现象发生在年降水量为300 mm左右的地区。这表明,对于沙尘暴带的演化而言,年降水量为300 mm左右的地区是一个超常不稳定带。
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| 关 键 词： | 沙尘暴 跃变 黄土高原 |
| 文章编号： | 1000-694X（2008）01-0149-05 |
| 收稿时间： | 2006-11-15 |
| 修稿时间： | 2007-02-12 |
High-Frequency Zones and Abrupt Changes of Sandstorms in Loess Plateau Region of China |
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| XU Jiong-xin.High-Frequency Zones and Abrupt Changes of Sandstorms in Loess Plateau Region of China[J].Journal of Desert Research,2008,28(1):149-153. |
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| Authors: | XU Jiong-xin |
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| Institution: | Institute of Geographical Sciences and Natural Resources Research/Key Laboratory of Terrestrial Water Cycle and Surface Process, Chinese Academy of Sciences, Beijing 100101, China |
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| Abstract: | Based on the data of sandstorms and precipitation, a study of sandstorms in the Loess Plateau and the neighboring areas has been made. Through analysis of relationship between mean annual number of sandstorms and mean annual precipitation, an original sandstorm zone and a secondary high-frequency zone of sandstorms have been found. The latter was formed as a result of human activities such as vegetation destruction and waste-land cultivation. The secondary sandstorm zone is 350 km to 500 km away from the original sandstorm zone, reflecting that the sandstorm zone in the Loess Plateau area has been shifted 350 km to 500 km to the southeast, as response to human impacts. Some abrupt change has been found around the belt of mean annual precipitation of 300 mm, where the original sandstorm zone suddenly shifts to the secondary high-frequency zone of sandstorms. Hence, this transition area can be regarded as an abnormally unstable area. |
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| Keywords: | sandstorm abrupt change Loess Plateau |
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