Phosphorous and nitrogen losses characteristic in the runoffs in watersheds of Laoshan reservoir were studied based on runoff observations on four types of non-point pollution generating areas,i.e.forest land,orchard,cultivated land,and village.Synchronous monitoring of rainfall and water quality in the runoffs were performed during a rainy season in 2009.The results showed that the concentration of NH+4-N and dissolved total phosphorus in runoffs was much larger from village than those from other types,and...