研究论文

西藏湖泊正构脂肪酸分布特征及对古气候重建的启示

  • 凌媛 ,
  • 郑绵平 ,
  • 张永生 ,
  • 孙青 ,
  • 张成君
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  • 1. 中国地质科学院地质研究所, 北京 100037;
    2. 中国地质科学院矿产资源研究所, 国土资源部盐湖资源与环境重点实验室, 北京 100037;
    3. 国家地质实验测试中心, 北京 100037;
    4. 兰州大学地质科学与矿产资源学院, 兰州 730000
凌媛,博士,研究方向为有机地球化学,电子信箱:lingyuan0902@126.com

收稿日期: 2019-04-18

  修回日期: 2019-08-21

  网络出版日期: 2020-05-15

基金资助

中国博士后科学基金(2017M620852),中国地质调查项目(DD20160054),国家重点研发计划项目(2017YFC0602806)

Distribution characteristics of n-fatty acids in the arid Tibet lakes: Implications for paleoclimatic studies

  • LING Yuan ,
  • ZHENG Mianping ,
  • ZHANG Yongsheng ,
  • SUN Qing ,
  • ZHANG Chengjun
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  • 1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;
    2. Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;
    3. National Research Center of Geoanalysis, Beijing 100037, China;
    4. School of Geological Sciences and Mineral Resources, Lanzhou University, Lanzhou 730000, China

Received date: 2019-04-18

  Revised date: 2019-08-21

  Online published: 2020-05-15

摘要

脂肪酸广泛存在于各种地质载体,能够记录母源生存环境的相关信息。但关于脂肪酸的具体来源及分布特征的古气候意义尚不明确,导致脂肪酸相关指标在古气候重建中的应用较少。通过分析西藏干旱-半干旱区跨越3个气候带的湖泊和水洼的表层沉积物中的正构脂肪酸,揭示中、长链及部分短链正构烷脂肪酸的来源与正构烷烃的来源有关,可以相互对比验证。建立了指标与古气候要素的相关关系,发现正构脂肪酸含量、碳优势(CPI)指标随温度升高、降水增多而升高。提出了可用于古气候重建的中链占比(R-FA)指标,R-FA与年均气温和降水量成正比。

本文引用格式

凌媛 , 郑绵平 , 张永生 , 孙青 , 张成君 . 西藏湖泊正构脂肪酸分布特征及对古气候重建的启示[J]. 科技导报, 2020 , 38(8) : 77 -86 . DOI: 10.3981/j.issn.1000-7857.2020.08.009

Abstract

Fatty acids are widely distributed in various geological carriers, and can be taken as records of the living environment of the maternal sources. However, the specific sources and the paleoclimatic significance of the distribution characteristics of the fatty acids are still not completely clear, therefore, only a limited application of fatty acids is made in the paleoclimatic reconstruction. By analyzing the n-fatty acids in the surface sediments of lakes and puddles spanning three climatic zones in the arid/semi-arid Tibet, this paper reveals that the sources of middle, long chain n-fatty acids and a part of short chain ones are related to that of n-alkanes, which can be compared. The correlation between the indices and the paleoclimatic factors is established. It is shown that the content of the normal fatty acid and the CPI indices increase with the increase of the temperature and the precipitation. An R-FA indices for the paleoclimate reconstruction is proposed, which is proportional to the annual average temperature and precipitation.

参考文献

[1] Meyers P A. Organic geochemical proxies of paleoceanographic, paleolimnologic, and paleoclimatic processes[J]. Organic Geochemistry, 1997, 27(5/6):213-250.
[2] 谢树成, 梁斌, 郭建秋, 等. 生物标志化合物与相关的全球变化[J]. 第四纪研究, 2003, 23(5):521-528.
[3] Castañeda I S, Schouten S. A review of molecular organic proxies for examining modern and ancient lacustrine environments[J]. Quaternary Science Reviews, 2011, 30(21):2851-2891.
[4] Cranwell P A, Eglinton G, Robinson N. Lipids of aquatic organisms as potential contributors to lacustrine sediments-II[J]. Organic Geochemistry, 1987, 11(6):513-527.
[5] Meyers P A, Ishiwatari R. Lacustrine organic geochemistry:An overview of indicators of organic matter sources and diagenesis in lake sediment[J]. Organic Geochemistry, 1993, 20(7):867-900.
[6] Ficken K J, Li B, Swain D L, et al. An n-alkane proxy for the sedimentary input of submerged/floating freshwater aquatic macrophytes[J]. Organic Geochemistry, 2000, 31(7/8):745-749.
[7] Liu H, Liu W G. Concentration and distributions of fatty acids in algae, submerged plants and terrestrial plants from the northeastern Tibetan Plateau[J]. Organic Geochemistry, 2017, 113:17-26.
[8] Eglinton G, Hamilton R G. Leaf epicuticular waxes[J]. Science, 1967, 156:1322-1335.
[9] Chikaraishi Y, Naraoka H. δ13C and δD relationships among three n-alkyl compound classes (n-alkanoic acid, n-alkane and n-alkanol) of terrestrial higher plants[J]. Organic Geochemistry, 2007, 38(2):198-215.
[10] Zhou W J, Xie S C, Meyers P A, et al. Reconstruction of late glacial and Holocene climateevolution in southern China from geolipids and pollenin the Dingnan peat sequence[J]. Organic Geochemistry, 2005, 36:1272-1284.
[11] Zheng Y H, Zhou W J, Meyers P A, et al. Lipid biomarkers in the Zoigê-Hongyuan peat deposit:Indicators of Holocene climate changes in West China[J]. Organic Geochemistry, 2007, 38:1927-1940.
[12] Li X M, Wang M D, Hou J Z, et al. Centennial-scale climate variability during the past 2000 years derived fromlacustrine sediment on the western Tibetan Plateau[J]. Quaternary International, 2018, doi:10.1016/j.quaint. 2018.12.018.
[13] Tuo J C, Wu C J, Zhang M F, et al. Distribution and carbon isotope composition of lipid biomarkers in Lake Erhai and Lake Gahai sediments on the Tibetan Plateau[J]. Journal of Great Lakes Research, 2011, 37(3):447-455.
[14] Aichner B, Feakins S J, Lee J E, et al. High resolution leaf wax carbon and hydrogen isotopic record of late Holocene paleoclimate in arid Central Asia[J]. Climate of the Past, 2015, 11(6):619-633.
[15] 赵江涛, 刘卫国, 安芷生. 两种纯化方法获得脂肪酸的链长及碳同位素分布特征对比[J]. 岩矿测试, 2013, 32(1):101-107.
[16] Luo P, Peng P A, Lü H Y, et al. Latitudinal variations of CPI values of long-chain n-alkanes in surface soils:Evidence for CPI as a proxy of aridity[J]. Science China:Earth Science, 2012, 55(11):1134-1146.
[17] 周卫健, 陈清敏, 郑艳红. 我国不同空间格局泥炭类脂分子化石记录信息的时空对比[J]. 地球环境学报, 2011, 2(1):257-262.
[18] Xie S C, Nott C J, Avsejs L A, et al. Molecular and isotopic stratigraphy in an ombrotrophic mire for paleoclimate reconstruction[J]. Geochimica et Cosmochimica Acta, 2004, 68(13):2849-2862.
[19] Liu W G, Huang Y S. Compound specific D/H ratios and molecular distributions of higher plant leaf waxes as novel paleoenvironmental indicators in the Chinese Loess Plateau[J]. Organic Geochemistry, 2005, 36(6):851-860.
[20] Zhang Z H, Zhao M X, Eglinton G. Leaf wax lipids as paleovegetational and paleoenvironmental proxies for the Chinese Loess Plateau over the last 170 kyr[J]. Quaternary Science Reviews, 2006, 25(5):575-594.
[21] Rao Z G, Zhu Z Y, Wang S P, et al. CPI values of terrestrial higher plant-derived long-chainn-alkanes:A potential paleoclimatic proxy[J]. Frontiers of Earth Science in China, 2009, 3(3):266-272.
[22] Huang X Y, Meyers P A, Xue J T, et al. Paleoclimate significance of n-alkane molecular distributions and δ2H values in surface peats across the monsoon region of China[J]. Palaeogeography, Palaeoclimatology, Palaeoecology, 2016, 461:77-86.
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