Determination of nitrate sources in a karst plateau reservoir based on nitrogen and oxygen isotopes.

Investigating the sources, migration and proportional contribution of nitrate is essential to effectively protect water quality. N-NO, O-NO and Stable Isotope Analysis in R (SIAR) were used to qualitatively and quantitatively analyse nitrate sources in the Pingzhai Reservoir water body. The values of N-NO and O-NO in water vary with season.