降雨事件下农业面源污染控制工程降低营养盐输出的效果评价

Effect Evaluation of Reducing Nutritive Salt Discharge by the Control Project of Agricultural Diffused Pollution in the Case of Rainfall

采用降雨-径流过程同步流量和浓度监测方法,对柴河小流域农业面源污染控制示范工程区进行农业面源污染控制效果初步评价.通过降雨事件下河道水量、水质的全过程分析计算,表明降雨-径流过程同步流量和浓度监测方法适用于区域面源污染负荷的定量估算.同时,以2010年为基准年,可计算出2011年柴河小流域农业面源污染控制示范工程在降雨过程中对氮、磷污染物的削减率分别为49.60%、51.87%.

The effect of the non-point agricultural source pollution control in the Chaihe basin was evaluated tentatively by the synchronized flow and concentration monitoring in rainfall and runoff processes.The calculation and analysis of the quantity and quality of river water shows that the method is suitable for the quantitative estimation of diffused pollution load.With the year of 2010 as a reference,the demonstration project of agricultural non-point source pollution control in the Chaihe basin decreased nitrogen,phosphorus pollutants in rainfall by 49.60% and 51.87% respectively in 2011.