Analysis of Three-Dimensional Fluorescence Spectroscopic Characteristics in the Upper Reaches of the Fenhe Reservoir Basin
WANG Yan1, SUN Hui1, YANG Xiao-yu1, ZHANG Feng1, 2*, WANG Chao-xu1, 2, MAO Li-bo3
1. College of Environment and Ecology, Taiyuan University of Technology, Jinzhong 030600, China
2. Shanxi Province Innovation Center for High-Efficiency Wastewater Treatment Technology, Taiyuan 030000, China
3. Shanxi Dadi Environmental Investment Holding Co., Ltd., Taiyuan 030032, China
Abstract：The pollution characteristics of chromophoric dissolved organic matter (CDOM) are of great significance for revealing the carbon and nitrogen cycling mechanisms in water bodies, assessing the risk of eutrophication, and formulating precise control strategies. In view of the current situation of diffuse input of non-point source pollution and complex source-sink relationships in semi-arid basins, this study took the upper reaches of the Fenhe Reservoir as the research object. It used three-dimensional fluorescence spectroscopy (EEM) combined with fluorescence region integration (FRI) and parallel factor analysis (PARAFAC) models to systematically analyze the composition, sources, and spatiotemporal differentiation patterns of CDOM at 36 dry and tributary sections in summer and autumn. The results showed that CDOM in the basin contained five characteristic peaks, among which the humic-like peaks (A, M, and C peaks) dominated agricultural non-point source pollution, and the protein-like peaks (T and B peaks) significantly indicated the input of domestic sewage and livestock and poultry breeding wastewater. FRI analysis indicated that the proportion of humic-like substances reached 58.28% in summer; in autumn, the proportion of humic acid-like substances dropped sharply to 19.37%, while the proportions of fulvic acid-like (29.80%) and tryptophan-like protein (28.28%) substances increased. The PARAFAC model extracted three components: humic-like C1 (Ex/Em=255(315)/415 nm), C2 (Ex/Em=255(360)/470 nm), and protein-like C3 (Ex/Em=225(280)/340 nm); humic-like substances dominated the composition of CDOM in the basin, and the proportion of protein-like substances increased in autumn. Fluorescence parameters (FI, HIX, BIX) further verified the seasonal differentiation mechanism of CDOM, with land-based input being the main source in both summer and autumn, and the contribution of microbial activity increasing in autumn. The research results provide a scientific basis for dynamic water quality monitoring and precise control of non-point source pollution in semi-arid basins.
王 岩，孙 晖，杨晓宇，张 峰，王朝旭，毛立波. 汾河水库上游流域三维荧光光谱特性分析[J]. 光谱学与光谱分析, 2025, 45(10): 2992-3000.
WANG Yan, SUN Hui, YANG Xiao-yu, ZHANG Feng, WANG Chao-xu, MAO Li-bo. Analysis of Three-Dimensional Fluorescence Spectroscopic Characteristics in the Upper Reaches of the Fenhe Reservoir Basin. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2025, 45(10): 2992-3000.
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