[Output characteristics of non-point phosphorus from a typical small watershed in Yimeng mountainous area under the special rainfall].

The relationships between pollutant concentrations and precipitation-runoff combined with the first and maximum intensity natural rainfall events were monitored at the outlets of the Menglianggu watershed in 2010. The results showed that dissolved organic phosphorus (DOP), dissolved inorganic phosphorus (DIP), total dissolved phosphorus (DP), total particle phosphorus (PP) and total phosphorus (TP) concentrations in the first rainfall were higher than those in the maximum intensity rainfall which was the largest average rainfall intensity, but the output of phosphorusin the first rainfall was all higher than that in the maximum intensity rainfall except dissolved organic phosphorus. The DOP, DIP, DP, PP and TP in two special rainfall events contributed 48%, 81%, 70%, 87% and 81% of the total output of rainy season.