| 沙漠与沙漠化 |
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| Formation of Ulan Buh Desert and Its Environmental Evolution |
CHUN Xi1; CHEN Fa-hu2; FAN Yu-xin2; XIA Dun-sheng3; ZHAO Hui3 |
| 1.Institute of Geography Sciences, Inner Mongolia Normal University, Hohhot 010022, China;
2.National Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, China;
3.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 Extensive investigation and studies on topography, sedimentary and chronology show new evidences for formation and evolution of Ulan Buh desert during early Holocene.Proved by evidences on clay-sand strata and plant roots under inter-dune lowlands, lake shorelines covered by plenty of Corbicula largillierti, and large amounts of dry salt lakes in the central region of Ulan Buh desert, many megalakes ever existed in the hinterland of Ulan Buh desert. Several OSL samples collected from aeolian sands overlying lacustrine sediments in profiles around Jrentai salt lake and inter-dune lowlands in the southern Ulan Buh desert suggest that the desert began around 7 ka BP. The formation of Ulan Buh desert may be resulted from the shrinking of Jrentai megalake and sands blew from exposed loose sediments.
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Received: 01 January 1900
Published: 20 November 2007
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2007, Vol. 27 
