Evaluation of lacustrine organic delta C-13 as a lake-level indicator: A case study of Lake Qinghai and the satellite lakes on the Tibetan Plateau

doi:10.1016/j.palaeo.2019.109274

	Evaluation of lacustrine organic delta C-13 as a lake-level indicator: A case study of Lake Qinghai and the satellite lakes on the Tibetan Plateau
	Li, Xiangzhong 1,2,5; Liu, Weiguo 1,4; Xu, Liming 3
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2019-10-15
卷号	532 页码:10
关键词	Terrestrial plants Submerged plants Algae TOC/ON ratio Dissolved inorganic carbon Lake Qinghai
ISSN号	0031-0182
DOI	10.1016/j.palaeo.2019.109274
通讯作者	Li, Xiangzhong(lixiangzhong@ieecas.cn)
英文摘要	In recent years, the sedimentary delta(13)Corg values have been recognized to be indicative of lake-level changes in lakes on the Tibetan Plateau (TP). However, the sensitivity of sedimentary delta(13)Corg to lake-level changes and the potential relationship between lake-level variations and climatic forces are still unknown in this particular region. Here, we systematically evaluate sedimentary delta(13)Corg as a proxy of lake-level changes in lakes with different sizes on the TP. Consistent with previous studies, the total organic matter of sediments was mainly contributed by aquatic plants in lakes on the TP. In the studied lakes, sedimentary delta C-13 values mainly reflect lake-level changes, as the species of aquatic plants with different delta(13)Corg values strongly respond to lake level. However, sedimentary delta C-13 values are much more sensitive to lake-level changes in a moderate-depth lake (similar to 10 m) than those in a deep lake (27 m) or a shallow lake (< 3-5 m). In other words, the sedimentary delta(13)Corg may not effectively record lake-level changes on the TP when the lakes are deep (not sensitive) or shallow (only submerged plants). This relationship can be clearly seen in the case study in cores HY15 and GH02. The sedimentary delta(13)Corg trend in core HY15 was well correlated with the observed lake-level changes over the past 50 yr in Lake Qinghai. Based on the hypothesis that delta(13)Corg is indicative of lake-level changes, the lake-level change showed obvious millennial-scale oscillations in Lake Gahai (moderate lake) during the Holocene, but there were no obvious lake-level oscillations in Lake Qinghai (deep lake). In addition, the variation in the TOC/ON ratio suggested that sedimentary delta(13)Corg was often influenced by the contribution of terrestrial plants in Lake Gahai during the Holocene. Therefore, although delta(13)Corg was a very sensitive proxy of lake-level changes in lakes with maximum water depths ranging from 5 m to 20 m in lakes on the northeastem TP, we should consider the possible contribution of terrestrial plants when the sedimentary delta(13)Corg value is used as indicator of lake-level changes.
资助项目	National Science Foundation of China[41672163] ; West Light Foundation of The Chinese Academy of Sciences[XAB2015A01] ; Youth Innovation Promotion Association, CAS
WOS关键词	CARBON ISOTOPES ; CLIMATE-CHANGE ; GEOCHEMICAL PROXIES ; ATMOSPHERIC CO2 ; EARLY HOLOCENE ; N-ALKANES ; SEDIMENTS ; OXYGEN ; MATTER ; CHINA
WOS研究方向	Physical Geography ; Geology ; Paleontology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000484871600015
资助机构	National Science Foundation of China ; West Light Foundation of The Chinese Academy of Sciences ; Youth Innovation Promotion Association, CAS
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/13460]
专题	地球环境研究所_加速器质谱中心
通讯作者	Li, Xiangzhong
作者单位	1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China 2.Yunnan Univ, Res Ctr Earth Syst Sci, Kunming 650504, Yunnan, Peoples R China 3.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Qinghai, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Yunnan Key Lab Earth Syst Sci, Kunming 650504, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiangzhong,Liu, Weiguo,Xu, Liming. Evaluation of lacustrine organic delta C-13 as a lake-level indicator: A case study of Lake Qinghai and the satellite lakes on the Tibetan Plateau[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2019,532:10.
APA	Li, Xiangzhong,Liu, Weiguo,&Xu, Liming.(2019).Evaluation of lacustrine organic delta C-13 as a lake-level indicator: A case study of Lake Qinghai and the satellite lakes on the Tibetan Plateau.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,532,10.
MLA	Li, Xiangzhong,et al."Evaluation of lacustrine organic delta C-13 as a lake-level indicator: A case study of Lake Qinghai and the satellite lakes on the Tibetan Plateau".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 532(2019):10.