| Sandy grassland blowouts in Hulunbuir, northeast China: geomorphology, distribution, and causes |
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| 作者单位： | Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085，China Bureau of Land and Resources of Hulunbuir City，Hulunbuir 021008，China，Primary Education College of Hulunbuir University Hulunbuir 021000，China |
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| 基金项目： | 国家自然科学基金;内蒙古自然科学基金 |
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| 摘 要： | A sandy grassland blowout consists of an aeolian depression formed in top soil and the underlying sand deposit underlie, and the adjoining redeposit of sand derived from the depression. Research based on field survey and topographic mapping combined with aerophotograph interpretation reveals that: (1) All the three sand land tracts in Hulunbuir Grasslands are composed of blowout depressions and adjoining dunes, with interlaying remnants of sandy grasslands as background; (2) blowout depressions and their adjoining dunes can be classified according to their morphometric characteristics, development stages, and initiating factors; (3) blowouts develop mostly in the upper parts of sidelong aweather and sunward slopes inclining southwestward when west wind prevails; (4) initiation of blowouts is closely related with the coupling of extreme droughts and wide spread intense human disturbance to the fragile topsoil layer. The investigations indicate that key factors to prevent desertification are to protect grassland vegetation and topsoil.
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Sandy grassland blowouts in Hulunbuir,northeast China:geomorphology,distribution,and causes |
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| Authors: | ZHANG Altan MunkhDalai FENG Zongwei WANG Xiaoke SUN Hongwei ZHAO Jiaming U Hurlee |
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| Abstract: | A sandy grassland blowout consists of an aeolian depression formed in top soil and the underlying sand deposit underlie, and the adjoining redeposit of sand derived from the depression. Research based on field survey and topographic mapping combined with aerophotograph interpretation reveals that: (1) All the three sand land tracts in Hulunbuir Grasslands are composed of blowout depressions and adjoining dunes, with interlaying remnants of sandy grasslands as background; (2) blowout depressions and their adjoining dunes can be classified according to their morphometric characteristics, development stages, and initiating factors; (3) blowouts develop mostly in the upper parts of sidelong aweather and sunward slopes inclining southwestward when west wind prevails; (4) initiation of blowouts is closely related with the coupling of extreme droughts and wide spread intense human disturbance to the fragile topsoil layer. The investigations indicate that key factors to prevent desertification are to protect grassland vegetation and topsoil. |
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| Keywords: | Hulunbuir sandy grassland blowouts desertification |
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