Nitrate sources and transformations in the middle Yangtze River Basin under variable hydrology

This dataset contains water quality and nitrogen measurements collected from the middle Yangtze River Basin, including two hydrological periods: the rainfall season and the regular season. For each sampling period, the dataset includes concentrations of inorganic anions (Cl⁻, SO₄²⁻, K⁺), nitrogen species (NO₃⁻-N, NH₄⁺-N, total nitrogen), nitrogen isotopic compositions (δ¹⁵N-NO₃⁻, δ¹⁸O-NO₃⁻), and conventional water quality parameters (pH, dissolved oxygen, temperature). The measurements capture seasonal variability in hydrology and nutrient dynamics. These data can be used to investigate nitrate sources and transformations, assess nutrient cycling, and support environmental modeling in riverine systems.翻译