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DOI	10.1177/09596836221080763
	Vegetation and environmental changes since the Last Glacial Maximum inferred from a lake core from Saiyong Co, central Tibetan Plateau
	Liu, Lina; Hou, Xiaohuan; Yu, Xiaoshan; Wang, Nannan; Zhang, Yanrong; Cao, Xianyong
通讯作者	Cao, XY (通讯作者)
发表日期	2022
ISSN	0959-6836
EISSN	1477-0911
起始页码	543
结束页码	553
卷号	32 期号:6
英文摘要	Pollen and grain-size records from a small lake (Saiyong Co) in the source region of the Yangtze River, central Tibetan Plateau are presented and used to reveal vegetation and lake environmental history since the Last Glacial Maximum (LGM). Results indicate that the Saiyong Co basin was a marshy environment with sparse vegetation cover from 21.3 to 6.6 cal. ka BP, before becoming a lake. Highest water level is inferred for 3.9-3.4 cal. ka BP followed by a gradual drying up until 100 years ago. Since then, the lake level has begun to rise again. Pollen spectra are dominated by Artemisia, Poaceae and Cyperaceae, and vegetation changes are mainly reflected by changes in the proportion of these three taxa, especially Artemisia and Cyperaceae. Two major events occurred at 3.9 cal. ka BP and 1.2 cal. ka BP, in response to climate change. Our results also reveal that lake-level changes affect the interpretation of the pollen assemblages due to the relationship between lake size and the pollen source area. Local pollen became the dominant component in pollen assemblages at 0.6 cal. ka BP when the lake level fell to below a certain depth. A higher percentage of Cyperaceae marks the lake's retreat and reflects the local vegetation around Saiyong Co during 0.6 to similar to 0.1 cal. ka BP. In the last 100 years, a high value of Cyperaceae is linked to a wetter climate with no obvious evidence for human activities. Our results have important implications for the interpretation of fossil pollen assemblages from small lakes as the size of the lake through its history also needs to be known to prevent erroneous interpretations of the pollen data.
关键词	HOLOCENE CLIMATIC-CHANGE HIGH-RESOLUTION POLLEN SUMMER MONSOON SEDIMENT RECORD ASIAN MONSOON HUMAN IMPACT SOURCE AREA GRAIN-SIZE VARIABILITY RECONSTRUCTION
英文关键词	grain-size analysis; lake-level changes; pollen analysis; pollen source area; principal component analysis (PCA); Yangtze River
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000768421400001
来源期刊	HOLOCENE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260556
推荐引用方式 GB/T 7714	Liu, Lina,Hou, Xiaohuan,Yu, Xiaoshan,et al. Vegetation and environmental changes since the Last Glacial Maximum inferred from a lake core from Saiyong Co, central Tibetan Plateau[J]. 中国科学院青藏高原研究所,2022,32(6).
APA	Liu, Lina,Hou, Xiaohuan,Yu, Xiaoshan,Wang, Nannan,Zhang, Yanrong,&Cao, Xianyong.(2022).Vegetation and environmental changes since the Last Glacial Maximum inferred from a lake core from Saiyong Co, central Tibetan Plateau.HOLOCENE,32(6).
MLA	Liu, Lina,et al."Vegetation and environmental changes since the Last Glacial Maximum inferred from a lake core from Saiyong Co, central Tibetan Plateau".HOLOCENE 32.6(2022).