Abstract: #$NL#$NL:STheSLCPRO SPortableSphotosynthesisSmeasuringSsystemSwasSusedStoSmeasureSandSanalyzeStheSdailySchangesSofSphotosyntheticSandStheSlightSresponseSofSAltingiaSgracilipes,SandStheSresultsSshowSthat:STheSdiurnalSvariationScurveSofSAltingiaSgracilipes’SnetSphotosyntheticSrateS(Pn),StranspirationSrateS(Tr),SstomatalSconductance(SGs)SallSappearedSasSsingleSpeak,SshowedSnoneSofS“middaySrest”Sphenomenon.STheSmaximumSofSdiurnalSvariationSofSwaterSuseSefficiencyS(WUE)SandSlimitingSvalueSofSstomataS(Ls)SasSaScurveScameSoutSinS9am,SandSdecreasedSrapidlySsinceS5pm.STheSdiurnalSvariationSofSintercellularSCO2SconcentrationS(Ci)SasSaScurveStendStoSbeStheSexactScontraryStoSthatSofSLs.SPnSshowedSaShighlySsignificantSpositiveScorrelationSwithSphotosyntheticallySactiveSradiationS(PAR)SandSTr,SandSaShighlySsignificantSnegativeScorrelationSwithSCi,SratherSthanSotherSfactors,SPnSconnectedSmoreSobviousSwithSitsSinsideSownSfactors.SAltingiaSgracilipesShasShighSlightSsaturationSpointS(LSP),SlightScompensationSpointS(LCP),SandSapparentSquantumSyieldS(AQY),SknownSasSaSkindSofStypicalSheliophilousStreeSspecies.SAltingiaSgracilipesShasSaSstrongScapabilitySofSmakingSuseSofShighSlight,SasSwellSasSaShighSefficiencySofSusingSlowSlight,SperformsSgoodSenvironmentalSadaptability.#$NL#$NLKeywords:AltingiaSgracilipes;SphotosyntheticScharacteristics;SdiurnalSvariation;Sphotoresponse