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《Periodical of Ocean University of China》 2017-12
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Absorbance and Fluorescence Spectrums of Chromophoric Dissolved Organic Matter in the Reed Wetland of Liaohe Estuary

LI Lu;ZOU Li;MENG Tai-Zhou;YANG Yang;WANG Jin-Shuang;REN Qian-Qian;DAI Qun-Ying;College of Environmental Science and Engineering,Ocean University of China;Key Laboratory of Marine Environmental Science and Ecology,Ministry of Education,Ocean University of China;Institute of Reed Science in Panjin;  
In order to investigatebiogeochemistry of dissolved organic matter in reed wetland at Liaohe estuary,diurnal monitoring was carried out in overlying waters at both dense and sparse areas in May,June and September,2015.Absorbance and fluorescence spectrums of chromophoric dissolved organic matter(CDOM)were studiedand the composition,characteristicsand transformation of CDOM were discussed as well.Results showed that,therelative contents of CDOM werehigher in May,and the absorbance coefficient a(280)was about twice as much as those in June and September.Fluorescence components decreased from fulvic-like,tryptophan-like,humic acid-like,and bacteria products totyrosine-like matters in term of fluorescence regional integration(FRI),in which humic-like matters accounted for over 50 %in the total normalized FRI.It was suggested that a similar source and producing pattern existed among DOC,CDOM and its fluorescence components,based on the statistical analysis results.CCA analysis on the absorbance and fluorescence spectrums of CDOM and environmental factors indicated that,temperature and irradiance played key roles in CDOM transformation and degradation.CDOM in May were abttributed to irrigating water and soil re-dissolving processes,and presented low ratios of protein-like to humic-like matters.CDOM in June were mostly transformed from primary products in overlying water,and presented higher ratios of protein-like to humic-like matters.CDOM in September was dominated by organic matters fromboth primary production and bacterial reproduction,in which more protein-like matters contained in CDOM.
【Fund】: 国家水体污染控制与治理科技重大专项项目(2013ZX07202-007);; 国家自然科学基金项目(41176064)资助~~
【CateGory Index】: X131.2;X173
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