| Influence of aquatic plants on the hydrogen isotope composition of sedimentary long-chain n-alkanes in the Lake Qinghai region, Qinghai-Tibet Plateau | |
| Liu WeiGuo1,2; Yang Hong3; Wang HuanYe1; Yao Yuan2; Wang Zheng1; Cao YunNing1 | |
| 2016-07-01 | |
| 发表期刊 | SCIENCE CHINA-EARTH SCIENCES
 |
| 卷号 | 59期号:7页码:1368-1377 |
| 文章类型 | Article |
| 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. |
| 关键词 | Hydrogen Isotope Long-chain N-alkanes Aquatic Plants Paleohydrology Proxy Lake Qinghai |
| WOS标题词 | Science & Technology ; Physical Sciences |
| DOI | 10.1007/s11430-016-5263-2 |
| 关键词[WOS] | DELTA-D VALUES ; SUMMER MONSOON ; STABLE CARBON ; ALKYL LIPIDS ; NAM CO ; CHINA ; VARIABILITY ; RECORD ; HYDROLOGY ; CLIMATE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000379345900005 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ieecas.cn/handle/361006/5709 |
| 专题 | 加速器质谱中心 |
| 作者单位 | 1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 2.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Peoples R China 3.Bryant Univ, Dept Sci & Technol, Coll Arts & Sci, Lab Terr Environm, Smithfield, RI 02917 USA |
| 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]. SCIENCE CHINA-EARTH SCIENCES,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. |
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| Influence of aquatic（738KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 请求全文 | |
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