简介：Theleachingandredistributionofnutrientsinthesurfacelayerof4typesofredsoilsinSoutheastChinawerestudiedwithalysimeterexperimentunderfiledconditions.Resultsshowedthattheleachingconcentratedintherainyseason(fromApriltoJune).Generally,theleachingofsoilnutrientsfromthesurfacelayerofredsoilswasintheorderofCa>Mg>K>NO3-N,Infertilizationtreatment,thetotalamountofsoilnutrientsleachedoutofthesurfacelayerinaredsoilderivedfromgranitewasthehighestinallsoils.Theuptakebygrassdecreasedtheleachingoffertilizerionsinsurfacelayer,particularlyforNo3-N,SoiltotalNandexchangeableK,CaandMginthesurfacelayerdecreasedwithleachingandgrassuptakeduringthe2yearswithoutnewfertilizationofurea,Ca(H2PO4)2,KCl,CaCO3andMgCO3,Camovedfromtheapplicationlayer(0-5cm)offertilizerandaccumulatedinthe10-30cmdepthinthesoilsstudiedexceptthatdervedfromquaternaryredclay.ThedeficiencyofsoilexchangeableKwillbecomeaseriousdegradationprocessfacingtheSoutheastChina.