Hydrochemical and Multi-Isotope Analysis of Nitrogen Sources and Transformation Processes in the Wetland-Groundwater System of Honghu Lake
To investigate how surface water-groundwater interactions influence the speciation and sources of nitrogen(N)in wetland-groundwater systems,this study focuses on the Honghu Lake wetland,and utilizing groundwater flow direction,hydrochemical methods and stable isotopes to demonstrate the speciation,sources and transformation of N in the wetland-groundwater system.The results indicate that nitrate and ammonium are the primary species of N in surface water and groundwater,respectively.Nitrate in surface water mainly originates from external river inputs,while ammonium in groundwater may result from organic matter degradation or autotrophic nitrate reduction to ammonium(DNRA),with the latter being the predominant source.Eutrophic lake water-groundwater interactions can introduce nitrate into groundwater and,under the influence of DNRA,create localized high ammonium groundwater.Therefore,surface water-groundwater interaction in wetlands is a significant driver affecting groundwater quality.
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