| 定量评价中国北方粉尘源区地表覆盖类型对表土风蚀强度的影响 |
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| 引用本文： | 梅凡民,张小曳,曹军骥,鹿化煜,王亚强.定量评价中国北方粉尘源区地表覆盖类型对表土风蚀强度的影响[J].海洋地质与第四纪地质,2004,24(1):119-124. |
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| 作者姓名： | 梅凡民 张小曳 曹军骥 鹿化煜 王亚强 |
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| 作者单位： | 中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室,西安,710075 |
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| 基金项目： | 国家重点基础研究发展规划项目(G2000048703)，中国科学院黄土与第四纪地质国家重点实验室开放基金资助(SKL LQG0212) |
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| 摘 要： | 根据中国北方不同地表覆盖类型下表土的微团粒粒度分布和粗糙度长度参数，应用DPM模型分别计算了高草覆盖下、低草覆盖下、开垦耕地、砂砾质戈壁、砾质戈壁和裸露沙地在不同摩擦速度时的跃移通量。结果表明，裸露的粉细砂和细砂的跃移通量分别是砂砾质戈壁的几十倍；只有在极高风速条件下低草和高草覆盖下的砾质砂地才出现风蚀，其跃移通量与前面几种覆盖类型存在着1—2个数量级的差异。不同覆盖条件下地表可蚀性组分粒度分布和粗糙度长度的差异是造成风蚀强度差异的主要原因。在此基础上。从风蚀机制讨论了中国北方第四纪粉尘和现代粉尘的主要源区。
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| 关 键 词： | 粉尘 地表覆盖类型 风蚀强度 表土 中国北方 |
| 文章编号： | 0256-1492(2004)01-0119-06 |
| 修稿时间： | 2003年11月13 |
QUANTITATIVELY ASSESSING THE INFLUENCE OF VARIOUS SURFACE LAND COVER TYPES ON WIND EROSION INTENSITY IN DUST SOURCES IN CHINA |
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| MEI Fan-min,ZHANG Xiao-ye,Cao Jun-ji,LU Hua-yu,WANG Ya-qiang arth Environment,Chinese Academy of Sciences,Xi'an ,China.QUANTITATIVELY ASSESSING THE INFLUENCE OF VARIOUS SURFACE LAND COVER TYPES ON WIND EROSION INTENSITY IN DUST SOURCES IN CHINA[J].Marine Geology & Quaternary Geology,2004,24(1):119-124. |
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| Authors: | MEI Fan-min ZHANG Xiao-ye Cao Jun-ji LU Hua-yu WANG Ya-qiang arth Environment Chinese Academy of Sciences Xi'an China |
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| Institution: | MEI Fan-min,ZHANG Xiao-ye,Cao Jun-ji,LU Hua-yu,WANG Ya-qiang arth Environment,Chinese Academy of Sciences,Xi'an 710075,China) |
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| Abstract: | On basis of parameters of size distribution of soil micro-aggregates and aerodynamic roughness length of various surface land cover types in the north of China, and the DPM model , the saltation fluxes of various land covers such as steppe with tall grass, steppe with low grass, Gobi with big gravel, Gobi with small gravel, loose till with big soil clods, and bare sand land in desert are computed under friction velocity from 0.20 to 1.00 m/s. The results indicate that the saltation fluxes of silty sand and fine sand with bare suface are about tens of times of that of Gobi with small gravel, whereas saltation fluxes of steppe with tall grass and steppe with low grass are 1~2 magnitudes order lower than the other land cover types as saltation occurs under high wind friction velocity. The great differences of wind erosion intensities between various land cover types result from different characters of erodible fraction size distribution and aerodynamic roughness length of the land cover types. The dust aerosol sources in the north of China from Quaternary to modern times are stated in the article. |
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| Keywords: | dust land cover types wind erosion wind erosion intensity the north of China |
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