Carbon isotopic characteristics and their genetic relationships for individual lipids in plants and sediments from a marsh sedimentary environment |
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| Authors: | Email author" target="_blank">Yi?DuanEmail author Hui?Zhang Chaoyang?Zheng Baoxiang?Wu Guodong?Zheng |
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| Institution: | 1. Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000, China
2. Department of Earth & Planetary System Science, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan |
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| Abstract: | The carbon isotopes of individual lipids in herbaceous plants and tree leaves in Ruoergai marsh were measured by the GC-IRMS
analytical technique in order to understand the inherent relationships of carbon isotopes between sedimentary and plant lipids
from typical marsh environment. The analytical results show that the carbon isotopic compositions of n-alkanes in different kinds of plants differ significantly. Mean δ 13C values of n-alkanes in herbaceous plants (-32.2‰–36.9‰) are 3.3‰ lower than those in woody plant (-27.2‰–35.0‰). The carbon isotopic
compositions of fatty acids in organisms (-30.3‰–36.2‰) are very similar to those of n-alkanes and the δ 13C values for unsaturated fatty acids are within the range of those for saturated fatty acids. The differences in δ 13C values between plant lipids are obvious and range from 2.4‰ to 7.8‰. It is observed that the carbon isotopic compositions
of sedimentary lipids are closely related to those of plant lipids. The carbon isotopic compositions (-27.0‰–36.9‰) of n-alkanes, ≥C16 fatty acids, n-alkanols, sterols and n-alkanones in the sediments are similar to those of plant lipids and the carbon isotopic compositions of short-chain sedimentary
lipids are similar to those of long-chain sedimentary homologues. These indicate that the sedimentary lipids are derived from
high plants. However, the δ 13C values of C14:0 and C15:0 fatty acids in the sediments are lighter than those of the same carbon number saturated homologues in plants, reflecting
the genetic features partially derived from bacteria. These data provide scientific evidence for carbon isotope-applied research
of individual lipids. |
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| Keywords: | marsh environment plants sediments individual lipids carbon isotopic compositions genetic relationships |
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