Holocene vegetation and climate change from a lake sediment record in the Tengger Sandy Desert, northwest China

被引:97
作者
Zhao, Y. [1 ]
Yu, Z. [1 ,2 ]
Chen, F. [1 ]
Li, J. [1 ]
机构
[1] Lanzhou Univ, Coll Earth & Environm Sci, MOE Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China
[2] Lehigh Univ, Dept Earth & Environm Sci, Bethlehem, PA 18015 USA
基金
中国国家自然科学基金; 美国国家科学基金会;
关键词
arid China; fossil pollen; Holocene climate change; lithology; Qingtu paleolake;
D O I
10.1016/j.jaridenv.2008.06.016
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 [生物信息与计算生物学]; 0713 [生态学];
摘要
We present lithology and fossil pollen data from a 384 cm sediment section from Qingtu paleolake in arid northwest China and discuss their environmental interpretations. The chronology was controlled by four accelerator mass spectrometry (AMS) radiocarbon dates on peat and bulk lake sediments. Lithology changes suggest a general sequence of local environment shifts from a non-lake environment before 7200 cal yr BP, through a shallow lake during 7200-3500 cal yr BP and a marsh during 3500-3000 cal yr BP, to a sandy desert after 3000 cal yr BP. Fossil pollen assemblages suggest a steppe desert during 7200-5200 cal yr BP, a period of rapid switches between upland and lowland pollen types from 5200 to 3000 cal yr BP, and a desert since 3000 cal yr BP. Both lithology and pollen data indicate that in a generally arid context, climate was extremely dry in the early Holocene, relatively wet at 7200-5200 cal yr BP, highly variable during 5200-3000 cal yr BP, and dry again after 3000 cal yr BP. The climate change around Qingtu Lake was likely controlled by the interplay of the East Asian summer monsoon, the mid-latitude westerlies and local topography around the Tibetan Plateau. (c) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2054 / 2064
页数:11
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