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1、1007-4619(2010)02-356-16JournalofRemoteSensing遥感学报Estimatinglight-useefficiencybytheseparatedSolar-inducedchlorophyllfluorescencefromcanopyspectraldataCHENGZhanhui1,2,LIULiangyun11.CenterforEarthObservationandDigitalEarth,ChineseAcademyofSciences,Beijing100190,China;2.CollegeofInfo
2、rmationandElectricalEngineering,ChinaAgricultureUniversity,Beijing100083,ChinaAbstract:Light-useefficiency(LUE)isacriticalparameterinmanyprimaryproductionmodelsforestimatingecosystemcarbonexchange.Theapplicationofthesemodelsonregionalandglobalscaleisrestrictedbecauseofthedifficulty
3、ofretrievingLUEfromairborneandsatelliteremotesensingimages.Vegetationchlorophyllfluorescenceisadirectindicatorofplantphysi-ology.Inthispaper,adiurnalexperimentwascarriedonmaizeonJuly5,2008.Thecanopyradiancespectraandtower-basedfluxdatawereacquiredsynchronouslytotestthepossibilityof
4、retrievingLUEbythesolar-inducedvegetationChlFsignals.Thecanopynetprimaryproduction(NEP)valueswerecalculatedusingeddycovariancemeasurementbyaCSAT3-Li7500Fluxsystem,andthegrossprimaryproduction(GPP)wasalsocalculatedbyaddingthesimulateddaytimerespiration.TwokindsofLUEbasedonGPP(LUEGPP
5、)andNEP(LUENEP)weredefinedbydividingtheabsorbedphotosyntheticactiveradiation(APAR).
TheChlFsignalsat760nmand688nmwerealsoseparatedfromthereflectedradiancespectrabasedonFraunhoferlinedepthalgorithminthetwooxygenabsorptionbands.TheChlFsignalswerestronglycorrelatedwithphotosyntheticac
6、tiveradiation
(PAR),especiallytheChlFat760nm(R2>0.99).BothNEPandGPPhadasignificantcorrelationwithChlF.Furthermore,
LUEGPPwasnegativelycorrelatedwiththeChlF’srelativeintensityat688nmand760nm,withacorrelationcoefficientR2of
0.6331and0.7861respectively.Moreover,theLUEmodelsbasedonthes
7、olar-inducedvegetationChlFsignalswerecomparedtosomepopularvegetationIndices(VIs)fromthecanopyreflectedspectra.CanopyLUEGPPwasprovedabletobeestimated
fromtheremotelysensedChlFsignals.Keywords:spectra,chlorophyllfluorescence,light-useefficiency(LUE),primaryproductionCLCnumber:TP79Doc
8、umentcode:ACitationformat:
