简介：Soilerosionatthehilly-gullyregionoftheLoessPlateauhasobviousverticalerosionzonationfromwatershedboundarytogullyedge.Meanwhile,upsloperunoffandsedimenthaveasignificantimpactonthedownslopeerosionprocess.Butduetothelimitsofresearchmethods,thereisnotmuchdataavailabletoquantifytheeffectsofupsloperunoffandsedimentonthedownslopeerosionprocessunderdifferentconditions.Theobjectiveofthisstudywastoquantifytheeffectsofupsloperunoffandsedimentonthedownslopeerosionprocessusingadual-boxsystemwitha15°gradientconsistingofa2m-longfeederboxanda5m-longtestboxunderdifferentrunoffratesandsedimentconcentrationsinupsloperunoff,rainfallintensitiesandsoilsurfaceconditions.Theresultsshowedthatthesedimentregimewasdetachment-transportdominantatsteephillslopes.ThenetsedimentdeliveryScausedbyupsloperunoffwascontrolledbysedimentconcentrationinupsloperunoff,especiallybyinteractionoftherainfallintensity,runoffrate,surfaceconditionanddominanterosionprocess.ThenetsedimentdeliverySaccountedforthetotalsedimentdeliverySftatdownslope31.7%to97.3%and27.8to89.7%forbothlooseandcompactsurfacetreatments,respectively.Rainfallintensity,slopegradient,surfacecondition,andrillerosiondevelopmenthadimportantinfluencesonthedownslopeerosionprocess.