Sources and Spatial Variation of Dissolved Organic Matter in Summer Water of Inflow Rivers Along Chaohu Lake Watershed

被引：5
作者：
Ning C.-W. [1 ]
Bao Y. [1 ]
Huang T. [1 ]
Wang J. [1 ]
机构：
[1] Anhui Province Key Laboratory of Wetland Ecosystem Protection and Restoration, School of Resources and Environmental Engineering, Anhui University, Hefei
来源：
Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 08期
关键词：
Chaohu Lake watershed; Dissolved organic matter (DOM); Parallel factor analysis; Three-dimensional excitation emission matrix fluorescence spectroscopy; Ultraviolet-visible spectrum (UV-vis);
D O I：
10.13227/j.hjkx.202012089
中图分类号：
学科分类号：
摘要：
The sources and spatial variations of dissolved organic matter (DOM) in summer water of inflow rivers (FL, HB, QY, ZH, and NF) along the Chaohu Lake watershed were analyzed using the ultraviolet-visible absorption spectrum (UV-vis) method and three-dimensional excitation emission matrix fluorescence spectroscopy-parallel factor analysis (EEM-PARAFAC). The specific ultraviolet absorbance of DOM at 254 nm in the NF river was lower than in other rivers, and the spectral slope ratio (SR) of the NF river was higher than that of the HB river. This showed that the urban runoff inputs reduce the aromaticity of DOM in the NF river water, but has little effect on the molecular weight. The high fluorescence index (FI) and biological index, and the low humification index, indicated the main autochthonous sources of the DOM in the NF river. Four humic-like components (C1-C4), comprising terrestrial organic matter (C1, C3, and C4) and microbial degradation products (C2), and two protein-like components (C5 and C6) were identified as the main sources of DOM in the inflow rivers along the Chaohu Lake watershed. The dissolved organic carbon and DOM fluorescence components in the river water exhibited spatial variation along the direction of flow. The DOM in water from FL, HB, QY, and ZH was sourced from soil runoff inputs, whereas in NF water, it was mainly sourced from urban runoff and wastewater treatment plant effluents. © 2021, Science Press. All right reserved.
引用
收藏
页码：3743 / 3752
页数：9
相关论文
共 54 条
[1]  
Wu F C, Tanoue E, Liu C Q., Fluorescence and amino acid characteristics of molecular size fractions of DOM in the waters of Lake Biwa, Biogeochemistry, 65, 2, pp. 245-257, (2003)
[2]  
Catalan N, Marce R, Kothawala D N, Et al., Organic carbon decomposition rates controlled by water retention time across inland waters, Nature Geoscience, 9, 7, pp. 501-504, (2016)
[3]  
Liang M Q, Shao M L, Cao C L, Et al., Characteristics of dissolved organic matter (DOM) and relationship with dissolved heavy metals in a peri-urban and an urban river, Environmental Science, 39, 5, pp. 2095-2103, (2018)
[4]  
Dong Y R, Li Y, Kong F L, Et al., Source, structural characteristics and ecological indication of dissolved organic matter extracted from sediments in the primary tributaries of the Dagu River, Ecological Indicators, 109, (2020)
[5]  
Wipfli M S, Richardson J S, Naiman R J., Ecological linkages between headwaters and downstream ecosystems: transport of organic matter, invertebrates, and wood down headwater channels, Journal of the American Water Resources Association, 43, 1, pp. 72-85, (2007)
[6]  
L∅nborg C, Carreira C, Jickells T, Et al., Impacts of global change on ocean dissolved organic carbon (DOC) cycling[J], Frontiers in Marine Science, 7, (2020)
[7]  
Fasching C, Wilson H F, D'Amario S C, Et al., Natural land cover in agricultural catchments alters flood effects on DOM composition and decreases nutrient levels in streams, Ecosystems, 22, 7, pp. 1530-1545, (2019)
[8]  
Li S D, Hou X, Shi Y, Et al., Rapid photodegradation of terrestrial soil dissolved organic matter (DOM) with abundant humic-like substances under simulated ultraviolet radiation, Environmental Monitoring and Assessment, 192, 2, (2020)
[9]  
Shao T T, Wang T., Effects of land use on the characteristics and composition of fluvial chromophoric dissolved organic matter (CDOM) in the Yiluo River watershed, China, Ecological Indicators, 114, (2020)
[10]  
Wang Y L, Hu Y Y, Yang C M, Et al., Variations of DOM quantity and compositions along WWTPs-river-lake continuum: implications for watershed environmental management, Chemosphere, 218, pp. 468-476, (2019)
123456