滇池流域城市型河流盘龙江入湖营养盐通量研究

Study on the flux of nutrients transporting into Dianchi Lake through Panlongjiang River

基于2009年一次降雨过程的入湖断面流量观测及总磷、氨氮浓度监测资料,分析了盘龙江总磷和氨氮的入湖通量变化情况。研究结果表明:断面的总磷和氨氮通量呈倒V形分布,降雨径流达到峰值时总磷和氨氮通量同时达到最大;入湖断面流量与总磷、氨氮浓度均呈一元线性正相关关系,说明盘龙江总磷和氨氮来源具有明显的非点源特征。在总磷、氨氮浓度分别减少20%4、0%6、0%8、0%的情况下,总磷、氨氮通量与浓度减少比例大致相当,说明削减进入盘龙江的雨水中的总磷、氨氮负荷量对于降低进入滇池中总磷、氨氮是十分有效的。

According to the observation information of the section flux of Panlongjiang river into Dianchi lake and the monitoring data of the concentration of total phosphorus and ammonia nitrogen in once rainfall in the year 2009, we analyze the variation of TP and NH3 - N flux into Dianchi lake from Panlongjiang river in this paper. The research results show that： TP and NH3 - N flux of the sections is achieved maximum during the peak flow. There are linear positive correlation between the flow of the river sections and the concentration of TP and NH3 - N, which showed that the TP and NH3 - N load is mainly from non - point source. In the case of the concentration of TP and NH3 - N is decreased by 20% ,40% ,60% ,80% , respectively, it is consistent with the TP and NH3 -N flux, that is, it is effective to reduce the TP and NH3 - N amount of Dianchi lake by cutting TP and NH3 - N amount of rainwater into Panlongjiang river.