School of Geography & Environmental Science/School of Karst Science, Guizhou Normal University, Guiyang, People's Republic of China.
The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang, People's Republic of China.
Isotopes Environ Health Stud. 2023 May;59(2):142-160. doi: 10.1080/10256016.2023.2176850. Epub 2023 Feb 13.
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. Soil organic nitrogen and chemical fertilisers are the main sources of nitrate in autumn, while domestic sewage and livestock manure are the primary sources of nitrate in winter and spring. The SIAR results showed that chemical fertilisers, livestock manure, sewage, and soil organic nitrogen had the highest proportional contribution. In autumn, the proportional contribution of chemical fertilisers to river and reservoir were 47 and 51 %. During winter, the proportional contributions of livestock manure and sewage to river and reservoir were 53 and 68 %, respectively, and in spring 49 and 68 %, respectively. Considering the fragility of karst ecosystems, strict measures should be formulated for the use of chemical fertilisers and standards for sewage discharge should be raised. Control nitrogen input from agricultural activities and prevent water quality deterioration.
调查硝酸盐的来源、迁移和比例贡献对于有效保护水质至关重要。本研究采用 N-NO、O-NO 和稳定同位素分析在 R 中的应用（SIAR）对坪寨水库水体中的硝酸盐来源进行定性和定量分析。水体中 N-NO 和 O-NO 的值随季节而变化。土壤有机氮和化学肥料是秋季硝酸盐的主要来源，而生活污水和牲畜粪便则是冬季和春季硝酸盐的主要来源。SIAR 结果表明，化肥、牲畜粪便、污水和土壤有机氮的比例贡献最高。在秋季，化肥对河流和水库的比例贡献分别为 47%和 51%。在冬季，牲畜粪便和污水对河流和水库的比例贡献分别为 53%和 68%，而在春季则分别为 49%和 68%。考虑到喀斯特生态系统的脆弱性，应制定严格的化肥使用措施，并提高污水排放标准。控制农业活动中的氮输入，防止水质恶化。
