| 论文编号: | |
| 论文题目: | Characterization of CDOM in saline and freshwater lakes across China using spectroscopic analysis |
| 英文论文题目: | Characterization of CDOM in saline and freshwater lakes across China using spectroscopic analysis |
| 第一作者: | 宋开山 |
| 英文第一作者: | Kai S.Song |
| 联系作者: | 宋开山 |
| 英文联系作者: | Kai S.Song |
| 外单位作者单位: | |
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| 发表年度: | 2019 |
| 卷: | 150 |
| 期: | |
| 页码: | 403-417 |
| 摘要: | Colored dissolved organic matter (CDOM) is a major component of DOM in waters, and plays a vital role in carbon cycling ininland waters. In this study, thelight absorptionand three-dimensional excitation-emission matrix spectra (EEMs) of CDOM of 936 water samples collected in 2014–2017 from 234 lakes in fiveregionsacross China were examined to determine relationships between lake water sources (fresh versus saline) and their fluorescence/absorption characteristics. Results indicated significant differences regarding DOC concentration and aCDOM(254) between freshwater (6.68？mg？C L？1, 19.55？m-1) and saline lakes (27.4？mg？C L？1, 41.17？m-1). While humic-like (F5) and fulvic-like (F3) compounds contributed to CDOM fluorescence in all lake waters significantly, their contribution to total fluorescence intensity (FT) differed between saline and freshwater lakes. Significant negative relationships were also observed between lakealtitudewith either F5(R2？=？0.63, N？=？306) or FT(R2？=？0.64, N？=？306), suggesting that the abundance of humic-like materials in CDOM tends to decrease with increased in lakes altitude. In high-altitude lakes, strong solarirradianceand UV exposure may have inducedphoto-oxidationreactions resulting in decreased abundance of humic-like substances and the formation oflow molecular weightcompounds. These findings have important implications regarding our understanding of C dynamics in lacustrine systems and the contribution of these ecosystems to the global C cycle. |
| 英文摘要: | Colored dissolved organic matter (CDOM) is a major component of DOM in waters, and plays a vital role in carbon cycling ininland waters. In this study, thelight absorptionand three-dimensional excitation-emission matrix spectra (EEMs) of CDOM of 936 water samples collected in 2014–2017 from 234 lakes in fiveregionsacross China were examined to determine relationships between lake water sources (fresh versus saline) and their fluorescence/absorption characteristics. Results indicated significant differences regarding DOC concentration and aCDOM(254) between freshwater (6.68？mg？C L？1, 19.55？m-1) and saline lakes (27.4？mg？C L？1, 41.17？m-1). While humic-like (F5) and fulvic-like (F3) compounds contributed to CDOM fluorescence in all lake waters significantly, their contribution to total fluorescence intensity (FT) differed between saline and freshwater lakes. Significant negative relationships were also observed between lakealtitudewith either F5(R2？=？0.63, N？=？306) or FT(R2？=？0.64, N？=？306), suggesting that the abundance of humic-like materials in CDOM tends to decrease with increased in lakes altitude. In high-altitude lakes, strong solarirradianceand UV exposure may have inducedphoto-oxidationreactions resulting in decreased abundance of humic-like substances and the formation oflow molecular weightcompounds. These findings have important implications regarding our understanding of C dynamics in lacustrine systems and the contribution of these ecosystems to the global C cycle. |
| 刊物名称: | Water Research |
| 英文刊物名称: | Water Research |
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| 参与作者: | K. S. Song, Y. X. Shang, Z. D. Wen, P. A. Jacinthe, G. Liu, L. L. Lyu and C. Fang |
| 英文参与作者: | K. S. Song, Y. X. Shang, Z. D. Wen, P. A. Jacinthe, G. Liu, L. L. Lyu and C. Fang |
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Characterization of CDOM in saline and freshwater lakes across China using spectroscopic analysis
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