中文摘要：

目前水质常规监测频率较低,难以客观反映流域非点源污染物浓度随降雨径流过程的变化情况,结果会低估了流域非点源污染物的输出负荷。本文利用流域次降雨过程的连续水质水量同步监测资料,研究分析次降雨过程与流域非点源磷素输出负荷之间的因果关系,并建立次降雨总量与磷素输出负荷的定量相关关系。研究结果表明,流域次降雨总量与非点源磷素输出负荷之间存在较好的相关关系。通过这种定量关系,以流域次降雨总量为输入,可以更为合理地估算出流域非点源磷素输出负荷。

英文摘要：

At present, conventional monitoring frequency of water quality is relatively low, and it is difficult to objectively reflect the variation of the non-point source pollutants with rainfall-runoff process. In this circumstance, the export load of non-point source pollutants in a basin is sometimes underestimated. This paper used the synchronous monitoring data of water quality and volume in a basin to study the causal relationship between an individual rainfall event and the export phosphorus load and estab- lish relevant relation between the individual rainfall amount and export phosphorus load. The results show that they have good quantitative relationship. Making use of this kind of quantitative relationship and individual rainfall amount, the export phosphorus load in the basin can be reasonably estimated.