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The rainfall and distribution of rainwater drains explain the monthly and spatial variations of contribution of NO3--N sources well, respectively. In addition, less NO3--N in the urban channels derives from nitrification, which is consistent with the results of high properties of NH4+-N/TN in this region. Our results highlight the key roles of land use types and rainfall in NO3--N source apportionment, and provide support for the nitrogen management practices in urbanized regions.Aeration is one mainstream technique to accelerate munic