| Particulate n-alkanes and fatty acids in the Changjiang river system |
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| 作者姓名： | WU Ying ZHANG Jing LIU Sumei ZHANG Zaifeng CHEN Hongtao XIONG Hui |
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| 作者单位： | WU Ying1，ZHANG Jing1，2，LIU Sumei2，ZHANG Zaifeng3，CHEN Hongtao2，XIONG Hui21. State Key Laboratory of Estuarine and Coastal Research，East China Normal University，Shanghai 200062，China2. College of Chemical Engineering and Chemistry，Ocean University of China，Qingdao 266003，China3. Nantong Institute of Environmental Sciences，Nantong 314151，China |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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国家自然科学基金
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Shanghai Rising-star Project in China
,
教育部新世纪高校优秀人才计划
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教育部资助项目 |
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| 摘 要： | Particulate samples were collected from the Changjiang river system during a flood period, in May 1997, and POC, stable isotope and lipids associated with particles were examined. Results showed the decrease (0.84% ～ 1.88%) of organic carbon content from the upper reaches to the estuary.δ13C values of particulate organic carbon was in the range of -24.9×10-3 to -26.6×10-3, which were close to the isotopic signature of continental C3 vegetation. Total particulate n-alkanes concentrations varied from 1.4 to 10.1μg/dm3,or from 23.7 to 107μg/g of total suspended matter. Fatty acids were present in all the samples, from 1.4 to 5.4μg/dm3, with saturated and unsaturated straight-chain and branched compounds in the carbon number range from C12 to C30. Both δ13C and the ratio of carbon content to nitrogen content indicate the predominance of terrestrial inputs (soil organic matter) among the particles. The biomarker approach has been used to identify the relative portion of terrigenous and autochthonous fraction in the particulate samples. The distribution of fatty acids suggests a striking phytoplanktonic and microbial signal in most particle samples. The terrestrial alkanes are used to estimate the contribution of terrestrial inputs along the mainstream.
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| 关 键 词： | 长江水系 颗粒 n-烷烃 脂肪酸 |
| 收稿时间： | 2006-02-11 |
| 修稿时间： | 2006-07-25 |
Particulate n-alkanes and fatty acids in the Changjiang river system |
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| WU Ying,ZHANG Jing,LIU Sumei,ZHANG Zaifeng,CHEN Hongtao,XIONG Hui.Particulate n-alkanes and fatty acids in the Changjiang river system[J].Acta Oceanologica Sinica,2007,26(2):36-48. |
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| Authors: | WU Ying ZHANG Jing LIU Sumei ZHANG Zaifeng CHEN Hongtao and XIONG Hui |
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| Institution: | 1.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China2.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;College of Chemical Engineering and Chemistry, Ocean University of China, Qingdao 266003, China3.College of Chemical Engineering and Chemistry, Ocean University of China, Qingdao 266003, China4.Nantong Institute of Environmental Sciences, Nantong 314151, China |
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| Abstract: | Particulate samples were collected from the Changjiang river system during a flood period, in May 1997, and POC, stable isotope and lipids associated with particles were examined. Results showed the decrease (0.84% ～ 1.88%) of organic carbon content from the upper reaches to the estuary.δ13C values of particulate organic carbon was in the range of -24.9×10-3 to -26.6×10-3, which were close to the isotopic signature of continental C3 vegetation. Total particulate n-alkanes concentrations varied from 1.4 to 10.1μg/dm3,or from 23.7 to 107μg/g of total suspended matter. Fatty acids were present in all the samples, from 1.4 to 5.4μg/dm3, with saturated and unsaturated straight-chain and branched compounds in the carbon number range from C12 to C30. Both δ13C and the ratio of carbon content to nitrogen content indicate the predominance of terrestrial inputs (soil organic matter) among the particles. The biomarker approach has been used to identify the relative portion of terrigenous and autochthonous fraction in the particulate samples. The distribution of fatty acids suggests a striking phytoplanktonic and microbial signal in most particle samples. The terrestrial alkanes are used to estimate the contribution of terrestrial inputs along the mainstream. |
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| Keywords: | organic carbon δ13C n-alkanes fatty acids Changjiang River system the ChangJiang river alkanes estimate contribution mainstream distribution fatty acids signal particle biomarker approach used identify relative autochthonous fraction soil organic matter ratio |
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