| Citation: | Xu Jie, Liang Ying, Zhang Zhenchao, Jiang Xue, Ma Rui. Effects of seasonal variation in organic matter in groundwater on reactive nitrogen transport in the Jianghan Plain[J]. Bulletin of Geological Science and Technology, 2023, 42(4): 228-240. doi: 10.19509/j.cnki.dzkq.2022.0158
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Dissolved organic matter (DOM) is an important carbon source in the biogeochemical process of groundwater.
To reveal the impact of the seasonal variation in DOM on the migration and transformation in groundwater on N in the Jianghan Plain, long-term water level and hydrochemical data of groundwater and surface water at the Shahu monitoring site were obtained, and the hydrogeochemistry analysis was carried out. The seasonal variation characteristics of DOM were analysed by combing with three-dimensional fluorescence spectroscopy and UV-V is spectroscopy, to explore the role of DOM in groundwater in N migration and transformation under the influence of hydrological conditions.
The results show that DOM in groundwater and surface water includes three components: terrestrial humic-like component (C1), microbial tryptophan-like component (C2) and microbial humic-like component (C3). The input of microbial tryptophan-like components increases in dry season and terrestrial humic-like components increase in wet season. The strong reducibility and high dissolved organic carbon(DOC) content of groundwater provide conditions for the nitrate reduction, and low humification and low molecular weight C2 components are preferentially utilized in N migration and transformation. In dry season, the groundwater level decreases, the aquifer is partial to oxidation, the unstable protein-like components quickly degrade and release NH4-N, the nitrification and organic nitrogen mineralization rates are higher, and the denitrification and dissimilatory nitrite reduction to ammonium(DNRA) reaction rates are lower. In the wet season, the groundwater level rises, the aquifer tends to be reductive, and nitrification is inhibited. The presence of a large amount of DOM that is not easy to be degraded reduces the mineralization reaction rate of organic nitrogen in the aquifer, and the denitrification and DNRA processes are promoted.
In summary, the seasonal variation in DOM in the study area is an important factor in controlling the migration and transformation of N in groundwater.
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