| 引用本文: | 王丽芳,熊永强,吴丰昌,房吉敦,李芸.巢湖柱状沉积物中甘油二烷基甘油四醚脂(GDGTs)的组成特征.湖泊科学,2010,22(3):451-457. DOI:10.18307/2010.0320 |
| WANG Lifang,XIONG Yongqiang,WU Fengchang,FANG Jidun,LI Yun.The composition and characteristics of glycerol dialkyl glycerol tetraethers(GDGTs)in core sediment from Lake Chaohu. J. Lake Sci.2010,22(3):451-457. DOI:10.18307/2010.0320 |
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| 巢湖柱状沉积物中甘油二烷基甘油四醚脂(GDGTs)的组成特征 |
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王丽芳1,2, 熊永强3, 吴丰昌4, 房吉敦1,2, 李芸3
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1.中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550002;2.中国科学院研究生院, 北京 100049;3.中国科学院广州地球化学研究所有机地球化学国家重点实验室, 广州 510640;4.中国环境科学研究院湖泊生态环境基地国家环境保护湖泊污染控制重点实验室, 北京 100012
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| 摘要: |
| 甘油二烷基甘油四醚脂（GDGTs）是目前生物地球化学研究的热点之一.与GDGTs有关的指标已成功地应用在海洋环境中有关来源判识和古环境古气候重建的研究,但是在湖泊环境中的应用目前还比较有限.通过开展巢湖柱状沉积物中GDGTs的组成测定,为GDGTs类脂分子标志物在湖泊系统中的应用提供依据.研究表明由柱状沉积物中支链GDGTs参数计算得到的量化结果与巢湖周围流域的环境温度、pH等历史记录能较好地吻合;柱状沉积物中类异戊二烯类GDGTs来源的不确定性可能是造成TEX86指标的量化结果和实际的水体温度出现较大偏差的重要原因.另外,沉积物中GDGTs指标和TOC、C/N、δ13Corg、δ15N等传统湖泊总体有机质参数以及其它分子标志物指标相比,具有高分辨性和抗干扰等特点.因此,湖泊中GDGTs有望成为湖泊古气候和古环境重建的重要指标. |
| 关键词: GDGTs 古气候 古环境 湖泊沉积物 巢湖 |
| DOI：10.18307/2010.0320 |
| 分类号: |
| 基金项目:中国科学院重要方向项目(KZCX2-YW-102);国家重点基础研究发展规划项目(2008CB418200);国家自然科学基金项目(40525011,U0833603、40873080);中国环境科学院项目(2007KYYW01);中国科学院有机地球化学国家重点实验室开放基金资助项目(0GL-200603)联合资助 |
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| The composition and characteristics of glycerol dialkyl glycerol tetraethers(GDGTs)in core sediment from Lake Chaohu |
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WANG Lifang1,2, XIONG Yongqiang3, WU Fengchang4, FANG Jidun1,2, LI Yun3
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1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, P. R. China;2.Graduate School of the Chinese Academy of Sciences, Beijing 100049, P. R. China;3.State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, P. R. China;4.State Environmental Protection Key Laboratory for Lake Pollution Control/Research Center of Lake Eco-environments, Chinese Research Academy of Environmental Sciences, Beijing 100012, P. R. China
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| Abstract: |
| Glycerol dialkyl glycerol tetraether(GDGTs ) is one of the recent hotspot in biogeochemical study. The proxies from GDGTs have been used successfully to reconstruct paleoenvironment and paleoclimate in many marine environments, however, its application in lacustrine environment is very limited. This study provided a valuable reference for the application of GDGTs in lake systems by analyzing the characteristics of GDGTs in core sediment from Lake Chaohu. Our study suggested that the quantification that was obtained by the proxies from branched GDGTs in core sediment from Lake Chaohu had a good agreement with the historical record including environmental temperature and pH in Chaohu basin. The quantification obtained by the proxies from isoprenoid GDGTs differed from the actual surface water temperature. It was possible that there are different source in sediment core. In addi-lion, compared with the traditional parameters of total organic matter in lake such as TOC, C/N ratios,δ13Corg and δ15N values,the proxies from GDGTs had higher resolution and stronger jam proof ability. So GDGTs may be a significant proxy to reconstruct paleoenvironment and paleoclimate. |
| Key words: GDGTs paleoclimate paleoenvironment lacustrine sediments Lake Chaohu |
