| 沙漠与沙漠化 |
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| Characteristics of Sand Granularity from Kumtag Desert and Its Environmental Significance |
| HE Qing1, YANG Xin-hua1,2, HUO Wen1, WANG Shi-gong3, SHANG Ke-zhen3, LIU Hong-yi4 |
| 1.Institute of Desert Meteorology, China Meteorological Administration，Urumqi 830002, China;
2.College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China；
3.School of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;
4.Lanzhou Institute of Arid Meteorology, CMA, Lanzhou 730020, China |
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Abstract Kumtag desert located at the northwest arid area of China is known as the sixth largest desert of China. Method of grain size analysis plays important role in sedimentary environment differentiation，hydrodynamic condition distinguishing, and grain size trend analysis, etc. Analyzing results to 20 sand samples taken from middle-northern, north margin, western, middle and southern, southeast margin of Kumtag Desert show that there are remarkable differentiation in grain-size distribution, and the mean parameters are as follows: median diameter Mz=1.55~2.92 Φ, the standard deviation σ1=0.41~1.11, skewness SK1=-0.11~0.31, kurtosis KG=0.77~1.23. The grain size frequency curves of the samples have characteristics of single peaks or multi-peaks; most of the sand skewness is nearly symmetric. The analytical results reveal that the sediments in Kumtag Desert are complex and diverse, having aeolian, lacustrine and alluvial（proluvial）sediments river and so on.
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Received: 20 February 2008
Published: 20 January 2009
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2009, Vol. 29 
