Sources and optical dynamics of chromophoric dissolved organic matter in Lake Gaoyou, Nansi, and Dongping

被引：1
|
作者：
Zhang L. [1 ,2 ]
Yang Y. [2 ]
Li Y. [1 ]
Shi Y. [1 ]
Zhou L. [1 ,3 ]
Zhou Y. [1 ,3 ]
Zhang Y. [1 ,3 ]
机构：
[1] State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing
[2] College of Environment Science and Engineering, China West Normal University, Nanchong
[3] University of Chinese Academy of Sciences, Beijing
来源：
Hupo Kexue/Journal of Lake Sciences | 2020年 / 32卷 / 02期
关键词：
Chromophoric dissolved organic matter (CDOM); Lake Dongping; Lake Gaoyou; Lake Nansi; Parallel factor analysis (PARAFAC); The South-to-North Water Diversion Project;
D O I：
10.18307/2020.0205
中图分类号：
学科分类号：
摘要：
Lake Gaoyou, Nansi, and Dongping are key connecting points on the east line of the South-to-North Water Diversion Project and play vital roles in the safety of water transfer. In this study, three-dimensional fluorescence spectroscopy coupled with parallel factor analysis (EEMs-PARAFAC) was used to analyze the optical characteristics of CDOM and the relationships between fluorescence components and water quality parameters in the three lakes in different hydrological seasons, and to unravel the sources and optical composition characteristics of CDOM. Three fluorescent components were obtained using parallel factor analysis (PARAFAC), including a terrestrial humic-like C1, a tryptophan-like C2 and a tyrosine-like C3. Upstream inflowing discharge have notable effects on the source and optical composition of CDOM in Lake Gaoyou with fluorescence intensity (Fmax) of C1 in the flood season is significantly higher than in the dry season (t-test, P<0.01), and C1 is positively correlated with a(254) (R2=0.85, P<0.01), indicating that terrestrial humic-like substances contributed primarily to the DOM pool in the lake. The contribution rate of C1 can reach 50% [FmaxC1/(FmaxC1 + FmaxC2 + FmaxC3)×100%]. Lake Gaoyou is greatly affected by the inflow water. Lake Dongping and Lake Nansi share similar source and optical composition of CDOM. The Fmax mean of C2 and C3 in Lake Dongping and Lake Nansi were significantly lower in the flood season than in the dry season (t-test, P<0.01), indicating the two lakes have a higher autochthonous CDOM contribution during the dry season. Humic-like C1 in Lake Gaoyou can be used to trace the dynamics of dissolved organic carbon concentration, and the accumulation of humic-like substances may increase the concentration of total phosphorus, totoal nitrogen, and chlorophyll-a in the lake. However, the correlations between C1 and the main water quality parameters including humic-like C1 were poor in Lake Dongping and Lake Nansi, showing different CDOM optical characteristics from that of Lake Gaoyou. © 2020 by Journal of Lake Sciences.
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页码：428 / 439
页数：11
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