光谱学与光谱分析 |
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Spectral Characteristics Variations of Chromophoric Dissolved Organic Matter During Growth of Filamentous Green Macroalgae |
JIANG De-gang, HUANG Qing-hui*, LI Jian-hua |
Key Laboratory of Yangtze River Water Environment of Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China |
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Abstract As an important component of dissolved organic matter (DOM), chromophoric dissolved organic matter (CDOM) plays a central role in the global biogeochemical carbon cycle. Macroalgae are essential producers in aquatic ecosystems. They can release a considerable part of photosynthetic products as CDOM. So changes in optical properties of CDOM are studied on filamentous green macroalgae-Chadophorasle found in tidal flats of a brackish Lake Beihu in natural field condition by using spectrometry. Humic-like fluorescence peaks and protein-like fluorescence peaks detected by fluorescence excitation-emission matrix spectrum (EEMS) change little in control experiment but increase dramatically in incubation experiment. Applying parallel factor analysis (PARAFAC) together with fluorescence excitation-emission matrix can get four components of CDOM (C1, C2, C3 and C4) which are relative to humic-like fluorescence peak A(C), M and protein-like fluorescence peak B, T respectively. In incubation experiment four components increase by 211.5%, 255.8%, 75.3% and 129.3% respectively while in control experiment components have little changes except C1 decreasing by 34.3%. Absorption coefficient a(355) increases by 92.9% and has positive significant correlation(P<0.01) with the four components in incubation experiment while a(355) decreases by 59.8% and only has correlation (P<0.05) with C1 in control experiment. As the parameters representing CDOM molecular weight and composition, M and S values in incubation experiment are smaller than in control experiment, which illustrate that aromatic and macromolecular CDOM is produced in growth of Chadophorasle. All results indicate that growth of Chadophorasle can change the content and composition of CDOM.
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Received: 2009-09-12
Accepted: 2009-12-16
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Corresponding Authors:
HUANG Qing-hui
E-mail: qhhuang@tongji.edu.cn
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