Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau

doi:10.1007/s11430-016-5263-2

	Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau
	Wang Zheng 3; Liu WeiGuo 1,3; Cao YunNing 3; Yao Yuan 1; Wang HuanYe 3; Yang Hong 2
刊名	SCIENCE CHINA-EARTH SCIENCES
	2016-07-01
卷号	59 期号:7 页码:1368-1377
关键词	Hydrogen Isotope Long-chain N-alkanes Aquatic Plants Paleohydrology Proxy Lake Qinghai
DOI	10.1007/s11430-016-5263-2
文献子类	Article
英文摘要	The hydrogen isotopic composition (delta D) of leaf wax long-chain n-alkanes (C-27, C-29, and C-31) from lacustrine sediments has been widely applied to reconstruct terrestrial paleoclimatic and paleohydrological changes. However, few studies have addressed whether the aquatic-derived n-alkanes can affect the delta D values of lake sedimentary long-chain n-alkanes, which are usually regarded as a recorder of the terrestrial hydrological signals. Here we systematically investigated delta D values of long-chain n-alkanes from modern aquatic plants, both near-shore and off-shore surface sediments, surrounding terrestrial plant litters, as well as river water and lake water in Lake Qinghai and its satellite lakes on the northeastern Qinghai-Tibet Plateau. Our data showed that (i) delta D values of long-chain n-alkanes from aquatic plants varied from -184aEuro degrees to -132aEuro degrees for n-C-27, from -183aEuro degrees to -138aEuro degrees for n-C-29, and from -189aEuro degrees to -130aEuro degrees for n-C-31, respectively, with no significant differences among the three n-alkanes homologues; (ii) delta D values of long-chain n-alkanes from aquatic plants were generally more positive than those from surrounding terrestrial plants, possibly because that they recorded the D-enrichment of lake water in this semi-arid region; (iii) delta D values of long-chain n-alkanes from surface sediments showed significant differences among the three n-alkanes homologues, due to the larger aquatic input of n-C-27 to the sedimentary lipid pool than that of n-C-31, and (iv) n-C-27 delta D values of near-shore aquatic plants and near-shore sediments are more negative than those from off-shore as a result of lower delta D values of near-shore lake water. Our findings indicate that in this region (i) the offset between sedimentary n-C-27 and n-C-31 delta D values (Delta delta DC27-C31) could potentially be used to evaluate if sedimentary long-chain n-alkanes are derived from a single source; (ii) while delta D values of n-C-27 may be influenced by lake water hydrological changes, sedimentary n-C-31 is derived predominantly from terrestrial plants and thus its delta D can serve as a relatively reliable indicator for terrestrial paleoclimatic and paleohydrological reconstructions.
WOS关键词	DELTA-D VALUES ; SUMMER MONSOON ; STABLE CARBON ; ALKYL LIPIDS ; NAM CO ; CHINA ; VARIABILITY ; RECORD ; HYDROLOGY ; CLIMATE
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000379345900005
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/5709]
专题	地球环境研究所_加速器质谱中心
作者单位	1.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Peoples R China 2.Bryant Univ, Dept Sci & Technol, Coll Arts & Sci, Lab Terr Environm, Smithfield, RI 02917 USA 3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
推荐引用方式 GB/T 7714	Wang Zheng,Liu WeiGuo,Cao YunNing,et al. Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau[J]. SCIENCE CHINA-EARTH SCIENCES,2016,59(7):1368-1377.
APA	Wang Zheng,Liu WeiGuo,Cao YunNing,Yao Yuan,Wang HuanYe,&Yang Hong.(2016).Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau.SCIENCE CHINA-EARTH SCIENCES,59(7),1368-1377.
MLA	Wang Zheng,et al."Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau".SCIENCE CHINA-EARTH SCIENCES 59.7(2016):1368-1377.