2014—2018年滇池盘龙江水质变化特征

Characteristics of Water Quality Changes during 2014—2018 in Panlong River of Dianchi Lake

摘要: 对2014—2018年盘龙江入湖口水质氮、磷浓度的时间、季节变化特征进行了分析,结果表明,2014—2018年盘龙江水质较为稳定,TN、TP、NH₃-N呈不显著的下降趋势,呈现浓度值雨季高于旱季的特征,与牛栏江引水前（2013年）比较,TN、TP、NH₃-N浓度下降50%～70%,但TN仍为劣Ⅴ类,TP虽然达到河流Ⅲ类水标准,但均超过湖库Ⅲ类水,TN、TP是影响盘龙江水质的主要因子。

Abstract: In December,2013,Niulan River diversion entered Dianchi Lake through Panlong River,as the water channel for Niulan River diversion project to Dianchi Lake.The change of environmental quality of Panlong River would be the best response to the water purification effect of the diversion project.The results showed that the water quality of Panlong River was relatively stable from 2014 to 2018.TN,TP and NH₃-N were no significant downward trend.However,the concentration values in rainy season were higher than that in dry season.Compared with that before Niulan River diversion project（2013）,the concentration of TN,TP and NH₃-N decreased by 50%-70%,but TN was still inferior to Class Ⅴ.Although TP met Class Ⅲ water standard for river,it still did not meet Class Ⅲ water standard for lake.Therefore,TN and TP were the main factors affecting the water quality of Panlong River.