干旱区生态环境知识资源中心(Arid): Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau

Arid

	Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau
	Liu Weiguo; Yang Hong; Wang Huanye; Yao Yuan; Wang Zheng; Cao Yunning
来源期刊	Science China. Earth Sciences
ISSN	1674-7313
出版年	2016
卷号	59 期号:7 页码:1368-1377
英文摘要	The hydrogen isotopic composition(deltaD) 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 deltaD values of lake sedimentary long-chain n-alkanes, which are usually regarded as a recorder of the terrestrial hydrological signals. Here we systematically investigated deltaD 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) deltaD values of long-chain n-alkanes from aquatic plants varied from -184%o to -132%o for n-C_(27), from -183%o to -138%o for n-C_(29),and from -189%o to -130%o for n-C_(31), respectively, with no significant differences among the three n-alkanes homologues;(ii) deltaD 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) deltaD 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) deltaD values of near-shore aquatic plants and near-shore sediments are more negative than those from off-shore as a result of lower deltaD 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) deltaD values(?deltaDC_(27)-C_(31)) could potentially be used to evaluate if sedimentary long-chain n-alkanes are derived from a single source;(ii) while deltaD 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 deltaD can serve as a relatively reliable indicator for terrestrial paleoclimatic and paleohydrological reconstructions.
英文关键词	Hydrogen isotope Long-chain n-alkanes Aquatic plants Paleohydrology proxy Lake Qinghai
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5757530
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335692
作者单位	Liu Weiguo, Institute of Earth Environment, Chinese Academy of Sciences, State Key Laboratory of Loess and Quaternary Geology, Xi'an, Shaanxi 710061, China.; Wang Huanye, Institute of Earth Environment, Chinese Academy of Sciences, State Key Laboratory of Loess and Quaternary Geology, Xi'an, Shaanxi 710061, China.; Wang Zheng, Institute of Earth Environment, Chinese Academy of Sciences, State Key Laboratory of Loess and Quaternary Geology, Xi'an, Shaanxi 710061, China.; Cao Yunning, Institute of Earth Environment, Chinese Academy of Sciences, State Key Laboratory of Loess and Quaternary Geology, Xi'an, Shaanxi 710061, China.; Yang Hong, Laboratory for Terrestrial Environment, Department of Science and Technology, College of Arts and Sciences, Bryant University, Smithfield, RI02917, USA.; Yao Yuan, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
推荐引用方式 GB/T 7714	Liu Weiguo,Yang Hong,Wang Huanye,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],2016,59(7):1368-1377.
APA	Liu Weiguo,Yang Hong,Wang Huanye,Yao Yuan,Wang Zheng,&Cao Yunning.(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	Liu Weiguo,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.