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The diffusion flux ranges of NH4+-N, NO3--N, and NO2--N across the sediment-water interface were -0.55-4.09, -1.44-3.67, and -0.88-0.04 mg·(m2·d)-1, respectively. There was still a potential release risk during the low temperature period. A large amount of NH4+-N accumulated in the sediments during the low-temperature period, which may affect the quality of the overlying water after the temperature rises. Therefore, studying the distribution of nitrogen across the sediment-water interface, and the risk of internal release of inorganic n