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Article

Optical Absorption Characteristics, Spatial Distribution, and Source Analysis of Colored Dissolved Organic Matter in Wetland Water around Poyang Lake

1
School of Geography and Environmental Science & Ministry of Education’s Key Laboratory of Poyang Lake Wetland and Watershed Research, Jiangxi Normal University, Nanchang 330022, China
2
School of Geosciences, East China University of Technology, Nanchang 330013, China
*
Author to whom correspondence should be addressed.
Academic Editors: Oliver J. Lechtenfeld and Peter Herzsprung
Water 2021, 13(3), 274; https://doi.org/10.3390/w13030274
Received: 18 December 2020 / Revised: 19 January 2021 / Accepted: 21 January 2021 / Published: 24 January 2021
(This article belongs to the Special Issue Dissolved Organic Matter Dynamics in Groundwater, Rivers, and Lakes)
Colored dissolved organic matter (CDOM) is an important part of aquatic ecosystems and plays a key role in the biogeochemical cycle. In this study, CDOM absorption spectrum curves and water quality parameters from 30 sampling sites in the wetlands of Poyang Lake, Jiangxi Province, China, were collected in October 2016. The optical absorption characteristics and spatial distribution of CDOM, the correlation between the absorption coefficient of CDOM at a wavelength of 355 nm (ag(355)), and the concentration of dissolved organic carbon (DOC) were analyzed. Spectral characteristic parameters—namely, E2/E3 (the ratio of the CDOM absorption coefficient at a wavelength of 250 nm to the CDOM absorption coefficient at a wavelength of 365 nm), SUVA254 (the ratio of the CDOM absorption coefficient at a wavelength of 254 nm to the DOC concentration), and spectral slopes—were used to infer the composition and sources of CDOM in the Poyang Lake wetlands. The results showed the following: (1) the CDOM absorption spectrum of water of the Poyang Lake wetlands presented significant spatial variation, showing a trend of south > west > north > east; (2) there was a strong linear correlation between the CDOM absorption coefficient and the DOC concentration in the water of the Poyang Lake wetlands (ag(355) = 1.075DOC–0.659 (r2 = 0.723, p < 0.001, n = 30)); (3) the analysis of the spectral characteristic parameters E2/E3, SUVA254, and spectral slopes showed that the CDOM in the Poyang Lake wetlands has relatively high aromaticity and molecular weight, which were shown to be mainly affected by terrestrial inputs. The results showed that the molecular weight and aromaticity of CDOM were higher in the south of the lake than in other parts. View Full-Text
Keywords: poyang lake wetlands; colored dissolved organic matter (CDOM); spatial distribution; absorption coefficient; spectral characteristics poyang lake wetlands; colored dissolved organic matter (CDOM); spatial distribution; absorption coefficient; spectral characteristics
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MDPI and ACS Style

Jian, Z.; Xu, J.; Huang, X.; Yang, W.; Hu, Q. Optical Absorption Characteristics, Spatial Distribution, and Source Analysis of Colored Dissolved Organic Matter in Wetland Water around Poyang Lake. Water 2021, 13, 274. https://doi.org/10.3390/w13030274

AMA Style

Jian Z, Xu J, Huang X, Yang W, Hu Q. Optical Absorption Characteristics, Spatial Distribution, and Source Analysis of Colored Dissolved Organic Matter in Wetland Water around Poyang Lake. Water. 2021; 13(3):274. https://doi.org/10.3390/w13030274

Chicago/Turabian Style

Jian, Zhengjun, Jian Xu, Xiaolan Huang, Wenjing Yang, and Qiwu Hu. 2021. "Optical Absorption Characteristics, Spatial Distribution, and Source Analysis of Colored Dissolved Organic Matter in Wetland Water around Poyang Lake" Water 13, no. 3: 274. https://doi.org/10.3390/w13030274

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