摘要：Through investigating total phosphorus (TP) and ammonia nitrogen (NH3-N) concentrations of Baoxiang River, the spatial-temporal patterns and influencing factors of the TP and NH3-N pollution were studied. The results showed that the TP concentration increased gradually from the upper to lower reaches of the river, and TP concentrations at the town sites of Xiaobanqiao and Guandu were 0.5mg/L from July to September 2013, equalling or far exceeding the water quality V standard of surface water. Moreover, the correlation analysis indicated a strong relationship between TP concentrations and the precipitation of Kunming city, with R2 of 0.17-0.68. However, the NH3-N concentration showed no significant pattern, with the high NH3-N values found in the site of Baitu town, Dashiba and Ganhaizi. The relationship between the NH3-N concentration of the river and the precipitation was insignificant. In the inverse distance weighted (IDW) analysis, the variations of the TP and NH3-N in the Baoxiang River were calculated. The high concentration area of TP was mainly located in the downstream region of the Baoxiang River, and the NH3-N concentration exceeded the groundwater quality of Grade Ⅲ throughout the year. All of these demonstrate that the TP concentrations of Baoxiang River was mainly influenced by the precipitation of Kunming city, and the frequent agriculture cultivation has further increased the loading of NH3-N concentration in the Baoxiang River. In addition, the amount of domestic sewage, which comes from the densely populated residential and popular tourist area of Kunming city, has exacerbated the eutrophication of Baoxiang River.
关键词：Total phosphorus; Ammonia Nitrogen; Spatial-temporal variation; Eutrophication; Dianchi Lake catchment
