Variations in hydrogen isotopic fractionation in higher plants and sediments across different latitudes: Implications for paleohydrological reconstruction
文献类型：期刊论文
| 作者 | Liu, JZ (Liu, Jinzhao)1,2; An, ZS (An, Zhisheng)1 |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2019-02-10 |
| 卷号 | 650期号:1页码:470-478 |
| 关键词 | Apparent fractionation Leaf wax Plant types Sediments Latitude zones |
| 产权排序 | 1 |
| 英文摘要 | Sedimentary delta Dn-alkane value is widely utilized as a reliable proxy for paleo-hydrological reconstruction. Applications of this proxy must be based upon a globally clear understanding of the relationship between leaf wax dDn-alkane values and precipitation delta D(delta D-p), defined as apparent fractionation (epsilon(app)). However, there is a critical concern about whether relatively constant epsilon(app) values exist across different latitudes. In this study, we systematically analyzed the variations of available epsilon(app) with latitudes based upon two compiled-new databases of higher plants and sediments over the world. We found that the total average eapp was relatively constant, i.e., -116 +/- 5% (n = 941), in higher plants across different latitudes without consideration of plant types (e.g., dicots, monocots, gymnosperms), and was still constant but slightly lower average eapp, i. e., -125 +/- 6% (n = 460), in sediments across the latitudes. The slightly lower average eapp in sediments relative to higher plants probably derived from the contribution of aquatic plants with isotopically D-depleted eapp in lake sediments. Interestingly, with consideration of plant types, average eapp increased in dicots but decreased inmonocots slightly from low to high latitudes. The counteraction of these competing trends generates relatively constant average eapp values in higher plants, and resultantly constant average eapp values occur in sediments at the global scale. It is important to elaborate relatively constant eapp values from higher plants and sediments across different latitudes when sedimentary delta Dn-alkane is utilized as a proxy for paleohydrological reconstruction. |
| 语种 | 英语 |
| 源URL | [http://ir.ieecas.cn/handle/361006/10953]  |
| 专题 | 地球环境研究所_古环境研究室 |
| 通讯作者 | Liu, JZ (Liu, Jinzhao) |
| 作者单位 | 1.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710061, Peoples R China; 2.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, JZ ,An, ZS . Variations in hydrogen isotopic fractionation in higher plants and sediments across different latitudes: Implications for paleohydrological reconstruction[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,650(1):470-478. |
| APA | Liu, JZ ,&An, ZS .(2019).Variations in hydrogen isotopic fractionation in higher plants and sediments across different latitudes: Implications for paleohydrological reconstruction.SCIENCE OF THE TOTAL ENVIRONMENT,650(1),470-478. |
| MLA | Liu, JZ ,et al."Variations in hydrogen isotopic fractionation in higher plants and sediments across different latitudes: Implications for paleohydrological reconstruction".SCIENCE OF THE TOTAL ENVIRONMENT 650.1(2019):470-478. |
入库方式： OAI收割
来源：地球环境研究所
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