摘要
Aredsoil,afluvo-aquicsoilandapermeablepaddysoilwereusedinalong-terminvestigationtostudychangesinnitrificationwithtreatments:1)soilincubation,2)liquidincubationinoculatedwithsoilsamples,and3)liquidincubationinoculatedwithammonia-oxidizingbacteria(AOB)fromthesoils.Thereweresignificantdifferences(P＜0.001)innitrificationratesamongthethreesoilswhenmeasuredfor28daysbyadding(NH4)2SO4attherateof154mgNkg-1drysoiltofreshsoil.However,theamountsofnitrifyingbacteriainthethreesoilswerenotrelatedtosoilnitrificationcapacity.WhenthesoilsamplesortheisolatesofAOBenrichedfromthecorrespondingsoilwereincubatedinliquidwithpH5.8,7.0and8.0buffersand10mmolL-1ammoniumnitrogen,therewerenosignificantnitrificationdifferencesinthesamesoiltypeateachpH.TheabilitytooxidizeammoniathroughAOBfromdifferenttypesofsoilsinahomogeneousculturemediumwassimilar,andthesoilnitrificationcapacitycouldreflecttheinherentpropertiesofasoil.AlteringtheculturemediumpHofindividualsoiltypealsoshowedthatacidificationofanalkalinefluvo-aquicsoildecreasednitrificationcapacity,whereasalkalinizationoftheacidicredsoilandpermeablepaddysoilincreasedtheirnitrification.Forabetterinsightintofactorsinfluencingsoilnitrificationprocesses,soilpropertiesincludingtextureandclaycompositionshouldbeconsidered.
出版日期
2005年03月13日（中国期刊网平台首次上网日期，不代表论文的发表时间）
