ZHANG Zhi-bin,YAN Da-jiang,JU Song,et al.Differences in Characteristics of Dissolved Organic Matter in Nansi Lake during Normal and Dry Seasons[J].China Water & Wastewater,2021,37(21 21):48-55.
Differences in Characteristics of Dissolved Organic Matter in Nansi Lake during Normal and Dry Seasons
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
21 21
Page:
48-55
Column:
Date of publication:
2021-11-01
- Keywords:
- Nansi Lake; chromophoric dissolved organic matter (CDOM); parallel factor analysis (PARAFAC); spectral absorption
- Abstract:
- Nansi Lake is the largest regulating and storage lake in the eastern route of the South-to-North Water Diversion Project. It is thus of great significance to explore the composition, source and spatial-temporal variation of the chromophoric dissolved organic matter (CDOM) in Nansi Lake to ensure the water quality of the eastern route. The composition and source characteristics of the CDOM in Nansi Lake under different hydrological scenarios were analyzed by excitation-emission matrices (EEMs) and parallel factor analysis (PARAFAC) in May and November 2019. Three fluorescent components were obtained through EEMs analyzed by PARAFAC, including the microbial humic-like C1, the terrestrial humic-like C2 and the tryptophan-like C3. Among them, the relative contribution of the components C1 and C3 to Nansi Lake was relatively large, and their combined contribution reached 80%, indicating that the content of the autochthonous CDOM in Nansi Lake might be higher than that of the exogenous input. The fluorescence intensity of the component C1 and C2 in the normal season was lower than that in the dry season, while that of the component C3 in the normal season was higher than that in the dry season. In different hydrological periods, the high values of the three fluorescence components generally occurred in the estuary of the lake. The correlation analysis showed that absorption coefficient a(254), specific UV absorption coefficient (SUVA254) and fluorescence peak integral ratio (IC∶IT) were significantly correlated with the fluorescence intensity of the three components, among which the fluorescence component C1 was significantly positively correlated with a(254) (r2=0.320, P<0.01), indicating that the CDOM absorption and fluorescence spectroscopy could effectively reveal the source and spectral characteristics of the CDOM in Nansi Lake.
Last Update:
2021-11-01