Water, Год журнала: 2025, Номер 17(10), С. 1410 - 1410

Опубликована: Май 8, 2025

The quality of shallow groundwater in agricultural areas is being increasingly threatened by nitrogen pollution. However, the complex interactions between natural and anthropogenic sources remain insufficiently studied. In this study, water chemical characteristics pollution key counties Yangtze River Basin were systematically investigated. Forty-three samples analyzed for major ions nitrides (NH4+, NO2−, NO3−) using hydrogeochemical analysis, spatial interpolation, positive matrix factorization (PMF) models. study area weakly alkaline (pH 7.36) dominated calcium (mean 112.67 mg/L) bicarbonate 361.95 mg/L), which reveals that are carbonate. total hardness has increased, concentration exhibits significant variability. Nitrates (NO3−) exceed safety thresholds across entire region strongly correlated with Cl−. PMF analysis identified following four factors: Factor 1 represents a combination processes; 2 attributed to fertilizer application septic tank leakage; 3 sourced from weathering carbonates decomposition organic matter reducing environment; 4 due leakage domestic sewage or livestock-derived wastewater. Spatial revealed hotspots vicinity urban, agricultural, livestock areas. This emphasizes human activities, such as over-fertilization inadequate wastewater management, main contributors area. addition, we compare find there distinct regional variations.

Язык: Английский