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1、PlantandSoil260:147154,2004.147©2004KluwerAcademicPublishers.PrintedintheNetherlands.AsynchronousfluctuationofsoilmicrobialbiomassandplantlitterfallinatropicalwetforestH.H.Ruan1,3,X.M.Zou2,3,5,F.N.Scatena4&J.K.Zimmerman31FacultyofForestResourcesandtheEnv
2、ironment,NanjingForestryUniversity,Nanjing,China.2XishuangbannaTropicalBotanicalGarden,TheChineseAcademyofSciences,88XuefuRoad,Kunming,Yunnan,650223,China.3InstituteforTropicalEcosystemStudies,UniversityofPuertoRico,P.O.Box23341,SanJuan,PR00931-3341,USA
3、.4DepartmentofEarthandEnvironmentalScience,UniversityofPennsylvania,240South33rdStreet,Philadelphia,PA19104-6316,USA.5Correspondingauthor∗Received2July2003.Acceptedinrevisedform15October2003Keywords:annualfluctuation,drying-rewettingcycles,litterfall,mic
4、robialbiomass,plant-microbialcompetition,tropicalwetforestAbstractCarbonavailabilityoftencontrolssoilmicrobialgrowthandthereisevidencethatatregionalscalessoilmicrobialbiomassispositivelycorrelatedwithabovegroundforestlitterinput.Weexaminedtheinfluenceofp
5、lantlitterfallonannualvariationofsoilmicrobialbiomassincontrolandlitter-excludedplotsinatropicalwetforestofPuertoRico.Wealsomeasuredsoilmoisture,soiltemperature,andplantlitterfallinthesetreatmentplots.Abovegroundplantlitterinputhadnoeffectonsoilmicrobia
6、lbiomassoronitspatternoffluctuation.Monthlychangesinsoilmicrobialbiomasswerenotsynchronizedwithabovegroundlitterinputs,butratherpreceededlitterfallbyonemonth.Soilmicrobialbiomassdidnotcorrelatewithsoiltemperature,moisture,orrainfall.Ourresultssuggestthat
7、changesinsoilmicrobialbiomassarenotdirectlyregulatedbysoiltemperature,moisture,orabovegroundlitterinputatlocalscaleswithinatropicalwetforest,andtherewereasynchronousfluctuationbetweensoilmicrobialbiomassandplantlitterfall.Potentialmechanismsforthisasynch
8、ronousfluctuationincludesoilmicrobialbiomassregulationbycompetitionforsoilnutrientsbetweenmicroorganismsandplants,andregulationbybelow-groundcarboninputsassociatedwiththeannualsolaranddrying-rewettingcyclesintropicalwetforests.Abb
