简介：WiththecontrolofpointsourcepollutioninDianchiLakebasin,andtheexpansionofKunmingcity,non-pointsourcepollutionhasbecomethemainsourcepollutionofurbanwaterenvironmentandDianchiLake.Torevealthenitrogenpollutioncharacteristicsinwatershed,thisresearchselectedkeymonitoringpointsandsectionsatBaoxiangriverbasininrainyseasonwhichisthepeaktransportedtimeofnon-pointsourcepollution,thenitrogenandhydrologicalindicatorsaremonitoredsystematically.Thedifferentformsofnitrogenareanalyzed,thepollutionloadofnitrogenarecalculatedandstudiedatcardinalsections;combinedwiththeliteraturedata,wecomparedthewaternitrogencharacteristicsofDianchibasinandTaihubasin,themainresultsareasfollows:(1)Insummer,waternitrogenformofBaoxiangriverintheCaoheareaisdominatedbynitratenitrogen,whileinotherareasitisdominatedbyammonianitrogenwhichisaccountedfor31%-50%oftotalnitrogen;(2)ThewaterpollutionloadsofBaoxiangrivertendedtoincreasefromupstreamtodownstream,fromJunetoAugustthetotalnitrogenpollutionmainlycomesfromurbanareasandthepollutionloadis166.408t;(3)InDianchiLakewatershedandTaihuLakewatershednitrogenconcentrationofinflowriverishigherthanthatofthelake,nitratenitrogenconcentrationbetweeninflowriverandlakeshowsalittledifference,whileammonianitrogenconcentrationofinflowriverishigherthanthatofthelake.TheresultscanprovidethetheoreticalbasisfornonpointsourcepollutioncontrolandurbanwaterenvironmentplanningandimprovementinDianchiLakeBasin.