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Sources of organic matter and paleo-environmental implications inferred from carbon isotope compositions of lacustrine sediments at Inexpressible Island, Ross Sea, Antarctica

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【作者】 WEI YangyangJIN JingNIE YaguangCHEN XinWU LibinFU PingqingLIU XiaodongSteven D.Emslie

【Author】 WEI Yangyang;JIN Jing;NIE Yaguang;CHEN Xin;WU Libin;FU Pingqing;LIU Xiaodong;Steven D.Emslie;Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China;Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences,Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province;LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences;Department of Biology and Marine Biology, University of North Carolina Wilmington;

【机构】 Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of ChinaKey Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences,Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui ProvinceLAPC, Institute of Atmospheric Physics, Chinese Academy of SciencesDepartment of Biology and Marine Biology, University of North Carolina Wilmington

【摘要】 The carbon isotopic composition of organic matter(δ13Corg) was determined in two sediment cores(IIL1 and IIL9) recovered from Inexpressible Island, Ross Sea, Antarctica, and analyzed to identify the sources of that organic matter. The δ13Corg values of sediments of IIL9 were found to vary between-14.6‰ and-11.6‰, with a mean of-13.4‰(n=48). These values were significantly higher than those of IIL1 sediments which varied between-23.2‰ and-20.4‰, with a mean of-21.8‰(n=55). The variation in δ13Corg values in these two sediment cores indicate different sources of organic matter. The relatively high δ13Corg values in IIL9 are in accordance with a source from algae, while the low δ13Corg values in IIL1 evince significant influence from penguin guano with algae as the secondary source. Compared with the reference data from other high-latitude lake sediments and plants, the δ13Corg values in IIL9 were extremely high, a result likely related to intense competition for CO2 assimilation among algal species during the growing season in this relatively shallow pond. These results indicate that sedimentary δ13Corg is a reliable proxy for paleo-primary productivity in ponds at Inexpressible Island.

【基金】 the Chinese Arctic and Antarctic Administration of the State Oceanic Administration for project support;the United States Antarctic Program (USAP);Antarctic Support Contract and Italian Mario Zucchelli Station for logistical support. R. Murray and A. Mc Kenzie provided valuable assistance in the field;supported by the National Natural Science Foundation of China (Grant nos. 41576183 and 41376124);National Science Foundation (Grant no. ANT 0739575)
【所属期刊栏目】 Article (2016年04期)
  • 【DOI】10.13679/j.advps.2016.4.00233
  • 【分类号】P512.2;P597
  • 【下载频次】6
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