| 巴丹吉林沙漠高大沙山形成演化初步探讨 |
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| 引用本文： | 张伟民,王涛.巴丹吉林沙漠高大沙山形成演化初步探讨[J].中国沙漠,2005,25(2):281-286. |
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| 作者姓名： | 张伟民 王涛 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站, 沙漠与沙漠化重点实验室, 甘肃兰州 730000 |
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| 基金项目： | 国家重点基础研究发展规划项目(G2000048702，G2000048705)，自然科学基金(49501014)共同资助 |
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| 摘 要： | 对巴丹吉林沙漠高大沙山形态特征和环境因素的研究表明:高大沙山形成发育受沙源、风况、基底和植被等因素的影响,尤其受环境演变的影响较大。受西风环流的控制,沙山下伏地形的起伏不仅能够改变近地表风的运行形式,而且是风沙流运行的障碍。气候湿润期(间冰期)沙丘主要通过钙胶结层固定沙丘表面,并增大沙山基底;气候干冷期(冰期)在钙胶结层又发育次一级的沙丘。经过钙胶结固定-加积-再钙胶结固定循环的演化模式,最终发育成高大的复合型沙山。
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| 关 键 词： | 高大沙山 形成演化 环境因素 巴丹吉林沙漠 |
| 文章编号： | 1000-694X(2005)02-0281-06 |
| 收稿时间： | 2004-03-11 |
| 修稿时间： | 2004年3月11日 |
Approach to Formation and Evolution of Megadunes in Badain Jaran Desert |
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| ZHANG Wei-min,WANG Tao.Approach to Formation and Evolution of Megadunes in Badain Jaran Desert[J].Journal of Desert Research,2005,25(2):281-286. |
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| Authors: | ZHANG Wei-min WANG Tao |
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| Institution: | Shapotou Desert Experimental Research Station & The Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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| Abstract: | Studies on the distributive features of megadune and effect of environmental factors in the Badain Jaran Desert showed that megadune formation and development were affected by sand supply, wind regimes, dune bases and vegetation etc, particularly by environmental evolution. The development of sand mountains was controlled by Westerlies, the underlying landform of megadunes not only caused the wavy movement of near-surface air stream but also became the barrier to blown sand movement. During the humid period (interglaicial period) sand dune surface was stabilized by calcareous cement layer, thus the dune bases were enlarged. During the arid and cold period (glacial period), secondary sand dunes developed on calcareous cement layers to form complex sand dunes, finally through the dune evolution cycles of calcareous stabilization-dune accretion-calcareous stabilization, mega sand mountains formed. |
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| Keywords: | megadunes development and formation environmental evolution Badain Jaran Desert |
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