The Distribution of DOM in the Wanggang River Flowing into the East China Sea

Jie Ma, Dongyan Pei, Xuhan Zhang, Qiuying Lai, Fei He, Chao Fu, Jianhui Liu and Weixin Li
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Jie Ma: Nanjing Institute of Environment Sciences, Ministry of Ecology and Environment, Nanjing 210023, China
Dongyan Pei: School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
Xuhan Zhang: College of Hydrology and Water Resources, Hohai University, Nanjing 210024, China
Qiuying Lai: Nanjing Institute of Environment Sciences, Ministry of Ecology and Environment, Nanjing 210023, China
Fei He: Nanjing Institute of Environment Sciences, Ministry of Ecology and Environment, Nanjing 210023, China
Chao Fu: College of Hydrology and Water Resources, Hohai University, Nanjing 210024, China
Jianhui Liu: College of Hydrology and Water Resources, Hohai University, Nanjing 210024, China
Weixin Li: Nanjing Institute of Environment Sciences, Ministry of Ecology and Environment, Nanjing 210023, China

IJERPH, 2022, vol. 19, issue 15, 1-12

Abstract: Dissolved organic matter (DOM) is a central component in the biogeochemical cycles of marine and terrestrial carbon pools, and its structural features greatly impact the function and behavior of ecosystems. In this study, the Wanggang River, which is a seagoing river that passes through Yancheng City, was selected as the research object. Three-dimensional (3D) fluorescence spectral data and UV–visible spectral data were used for component identification and source analysis of DOM based on the PARAFAC model. The results showed that the DOM content of the Wanggang River during the dry season was significantly higher than during the wet season; the DOM content increased gradually from the upper to lower reaches; the proportion of terrigenous components was higher during the wet season than during the dry. UV–Vis spectral data a 280 and a 355 indicated that the relative concentrations of protein-like components in the DOM of the Wanggang River were higher than those of humic-like components, and the ratio of aromatic substances in the DOM of the Wanggang River water was higher during the wet season. The DOM in the Wanggang River was dominated by protein-like components (>60%), and the protein-like components were dominated by tryptophan proteins (>40%). This study showed that the temporal and spatial distributions of DOM in rivers can be accurately determined using 3D fluorescence spectroscopy combined with the PARAFAC model. This provides useful insight into the biogeochemical process of DOM in rivers of coastal areas.

Keywords: DOM; river; three-dimensional fluorescence spectral (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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