Summary
Urban rivers are often characterized by high nitrate (NO<sub>3</sub><sup>-</sup>) loadings. High NO<sub>3</sub><sup>-</sup> loadings cause water quality and ecological damages, which undermines the sustainable development of cities. To date, the drivers of these high NO<sub>3</sub><sup>-</sup> loadings remain unclear. This study, for the first time, integrated natural-abundance isotopes (δ<sup>15</sup> N/δ<sup>18</sup>O-NO<sub>3</sub><sup>-</sup> and δD/δ<sup>18</sup>O-H<sub>2</sub>O) and <sup>15</sup>N-pairing techniques to comprehensively reveal the anthropogenic impacts on the NO<sub>3</sub><sup>-</sup> pollution in an urban river. Natural-abundance isotopes suggested that in both the wet and dry seasons, the NO<sub>3</sub><sup>-</sup> was predominantly from the conservative mixing of d
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