| WU Ying,ZHANG Jing,LIU Sumei,ZHANG Zaifeng,CHEN Hongtao,XIONG Hui. 2007. Particulate n-alkanes and fatty acids in the Changjiang river system. Acta Oceanologica Sinica, (2):36－48 |
| Particulate n-alkanes and fatty acids in the Changjiang river system |
| Particulate n-alkanes and fatty acids in the Changjiang river system |
| Received:February 11, 2006 Revised:July 28, 2006 |
| DOI： |
| Key words:organic carbon δ13C n-alkanes fatty acids Changjiang River |
| 中文关键词: organic carbon δ13C n-alkanes fatty acids Changjiang River |
| 基金项目: |
| Author Name | Affiliation | E-mail | | WU Ying | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China | wuying@sklec.ecnu.edu.cn | | ZHANG Jing | 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, China | | | LIU Sumei | College of Chemical Engineering and Chemistry, Ocean University of China, Qingdao 266003, China | | | ZHANG Zaifeng | Nantong Institute of Environmental Sciences, Nantong 314151, China | | | CHEN Hongtao | College of Chemical Engineering and Chemistry, Ocean University of China, Qingdao 266003, China | | | XIONG Hui | College of Chemical Engineering and Chemistry, Ocean University of China, Qingdao 266003, 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 10.1 μg/dm3, or from 23.7 to 107 μg/g of total suspended matter.Fatty acids were present in all the samples, from 1.4 to 5.4 μg/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. |
| 中文摘要: |
| 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 10.1 μg/dm3, or from 23.7 to 107 μg/g of total suspended matter.Fatty acids were present in all the samples, from 1.4 to 5.4 μg/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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