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陆地植物有机分子化合物氢同位素组成及其古环境意义

关键词:hydrogen isotope compounds-specific plant soil

基金项目:国家重点基础研究发展规划项目（编号：2004CB720200），国家自然科学基金项目（编号：40121303，40373008）、全国优秀博士论文研究基金等项目支持

作者	单位	E-mail
刘卫国	中国科学院地球环境研究所黄土与第四纪地质国家重点实验室，陕西西安，710075	liuwg@loess.llqg.ac.cn
杨洪	Department of Science and Technology, Bryant University, Smith field, RI 02917, USA
黄永松	Department of Geological Sciences, Brown University, Providence, RI 02906, U.S.A
李立武	中国科学院兰州地质研究所气体地球化学重点实验室，甘肃兰州，730000

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Hydrogen Isotopic Composition of n-alkanes Extracted from Terrestrial Plants and Its Paleoenvironmental Implications

Development of compound-specific hydrogen isotope analysis (CSHIA) using gas chromatography/thermal conversion/isotope ratio mass spectrometry( GC/TE/IRMS) in recent years has spurred an upsurge of interests in obtaining paleoclimatic and paleo-environmental information from D/H ratios ofindividual organic compounds. Here, the δD values of n-alkanes extracted from 34 modern terrestrial plants, including 21 C3 grasses and 13 C4 grasses in north-western China, have been determined, The δD values range from -115‰ to -205‰ for C29,and from -113‰ to -226‰ for C31. The authors have found that the stable hydrogen isotope of plant leaf wax is responding to the terrestrial plant type, such as wood (tree and shrub) and grass. Although complex factors such as temperature, precipitation δD values and plant photosynthesis path can affect hydrogen isotopic composition of plants, the source waterδD values may be a dominated factor.The δD values of the n-alkanes from Xifeng loess profile spanning the last 130 kyr show large variations for the past 130 kyr,ranging from -140‰ to -190‰. Peaks of high D values coincide with dry phases (loess sections,δ18O stages 2 and 4),whereas those of low δD values coincide with wet phases (paleosol sections, δ18O stages 1, 3 and 5). The results obtained demonstrate that the combined D/H ratios of individual long chain n-alkanes and C31/C29 n-alkane ratios can be used as dditional proxies for paleoenvi-ronmental reconstructions in the Loess Plateau of China.

LIU Weiguo,YANG Hong,HUANG Yongsong,LI Liwu.2005.Hydrogen Isotopic Composition of n-alkanes Extracted from Terrestrial Plants and Its Paleoenvironmental Implications[J].Acta Geoscientica Sinica,26(z1):233-234.

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