| Citation: | TAI Jin，GONG Xulong，LIANG Ying，et al. Tracing of the sources of dissolved organic matter in coastal groundwater using fluorescence indices and end-member mixing analysis[J]. Bulletin of Geological Science and Technology，2025，44（6）：1-12 doi: 10.19509/j.cnki.dzkq.tb20230711
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Dissolved organic matter (DOM) in coastal groundwater is long-term mixed with from multiple sources, including terrestrial input, marine intrusion, and organic leachates from sediments. Quantitative estimation of the contributions of different sources is cruvial for understanding carbon transport and transformation processes in coastal aquifers.
In this study, coastal groundwater in Lianyungang City, Jiangsu Province was investigated using stable isotopic tracers, fluorescence indices, combined with end-member mixing analysis (EMMA) to identify and quantify DOM sources.
The results showed that DOM in coastal groundwater mainly derives from DOM in river water, seawater, and sediments, contributing 44% ±22%, 33% ± 10%, and 22% ± 13%, respectively. Groundwater in the northern part of the study area is affected by both seawater intrusion and freshwater recharge, exhibiting higher proportion of seawater DOM and stronger autochthonous characteristics. In contrast, groundwater in the southern part shows pronounced salinization, where elevated salinity enhances the mobilization of sediment-derived soluble organic matter, resulting in ground water DOM with a higher proportion of sediment-derived sduble organic matter contribution and humification characteristics.
This study highlights that DOM in coastal groundwater is jointly controlled by hydrodynamic and hydrogeochemical conditions. The integration of fluorescence indices with EMMA provides a reliable quantitative and efficient approach for source apportionment of DOM, offering new insights into the land–ocean continuum of the carbon cycle.
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