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MappingunderstoryvegetationusingphenologicalcharacteristicsderivedfromremotelysenseddataMao-NingTuanmua,⁎,AndrésViñaa,ScottBearerb,WeihuaXuc,ZhiyunOuyangc,HeminZhangd,JianguoLiuaaCenterforSystemsIntegrationandSustainability,DepartmentofFisheriesandWildlife,MichiganStateUniversity,EastLansing,MI48823,USAbTheNatureConservancy,WilliamsportFieldOffice,Williamsport,PA17701,USAcStateKeyLaboratoryofRegionalandUrbanEcology,ResearchCenterforEco-EnvironmentalSciences,ChineseAcademyofSciences,Beijing,ChinadChinaConservationandResearchCenterfortheGiantPanda,WolongNatureReserve,WenchuanCounty,SichuanProvince,ChinaabstractarticleinfoArticlehistory:Received2October2009Receivedinrevisedform16February2010Accepted17March2010AvailableonlinexxxxKeywords:UnderstoryvegetationMODISLandsurfacephenologySpatialdistributionHabitatmodelingUnderstoryvegetationisanimportantcomponentinforestecosystemsnotonlybecauseofitscontributionstoforeststructure,functionandspeciescomposition,butalsoduetoitsessentialroleinsupportingwildlifespeciesandecosystemservices.Therefore,understandingthespatio-temporaldynamicsofunderstoryvegetationisessentialformanagementandconservation.Nevertheless,detailedinformationonthedistri-butionofunderstoryvegetationacrosslargespatialextentsisusuallyunavailable,duetotheinterferenceofoverstorycanopyontheremotedetectionofunderstoryvegetation.Whilemanyeffortshavebeenmadetoovercomethischallenge,mappingunderstoryvegetationacrosslargespatialextentsisstilllimitedduetoalackofgeneralityofthedevelopedmethodsandlimitedavailabilityofrequiredremotelysenseddata.Inthisstudy,weusedunderstorybambooinWolongNatureReserve,Chinaasacasestudytodevelopandtestaneffectiveandpracticalremotesensingapproachformappingunderstoryvegetation.UsingphenologymetricsgeneratedfromatimeseriesofModerateResolutionImagingSpectroradiometerdata,wecharacter-izedthephenologicalfeaturesofforestswithunderstorybamboo.Usingmaximumentropymodelingtogetherwiththesephenologymetrics,wesuccessfullymappedthespatialdistributionofunderstorybamboo(kappa:0.59;AUC:0.85).Inaddition,byincorporatingelevationinformationwefurthermappedthedistributionoftwoindividualbamboospecies,BashaniafaberiandFargesiarobusta(kappa:0.68and0.70;AUC:0.91and0.92,respectively).Duetoitsgenerality,flexibilityandextensibility,thisapproachconstitutesanimprovementtotheremotedetectionofunderstoryvegetation,makingitsuitableformappingdifferentunderstoryspeciesindifferentgeographicsettings.Bothbiodiversityconservationandwildlifehabitatmanagementmaybenefitfromthedetailedinformationonunderstoryvegetationacrosslargeareasthroughtheapplicationsofthisapproach.©2010ElsevierInc.Allrightsreserved.1.IntroductionUnderstoryvegetationplaysanimportantroleinforestecosystems(Gilliam,2007;Nilsson&Wardle,2005).Differentstructureandspeciescompositionsofunderstoryplants,includingnativeandexoticspecies,canaffectregenerationoftreespecies,alterforestsuccession,andchangespeciesdiversitythroughphysical,chemical,andbiologicalmechanisms(Royo&Carson,2006;Urgensonetal.,2009).Understoryvegetationalsoprovidesessentialshelterandfoodresourcesforwildlife,andthusitsstructureandcompositionisusuallyassociatedwiththediversityandabundanceofmanywildlifespecies(Díazetal.,2005;Hagar,2007).Besidesitsecologicalfunctionsinforestecosystems,non-timberforestproductsprovidedbymanyunderstoryplants(e.g.,fibersfrombambooandrattansandmedicinesfrommedicinalherbs)areeconomicallyimportantformanycountries(Iqbal,1993).Therefore,understandingthespatio-temporaldynamicsofunderstoryvegetationisessentialnotonlyforwildlifeandbiodiversityconservation(Deal,2007;Estades&Temple,1999),butalsoforsustainableforestmanage-ment(FAO,1995).Whiletheimportanceofunderstoryvegetationiswellknown,detailedinformationonitsspatialdistributionacrosslargeareasanditsdynamicsatfinetemporalresolutionsisusuallyunavailablebecauseconventionalmethodsforgatheringvegetationinformationemphasizeonground-basedsurveys,whicharetime-consuming,labor-intensive,andsome-timeslogisticallyunfeasible.Althoughremotesensingisausefulalternativetoolforgatheringvegetationinformationacrosslargeareasandovertime(Jensen,2007;Roughgardenetal.,1991),remotedetectionofunderstoryplantsislimitedduetotheinterferenceofoverstorycanopies.WhilethepresenceofunderstoryvegetationinfluencestheRemoteSensingofEnvironmentxxx(2010)xxx–xxx⁎Correspondingauthor.CenterforSystemsIntegrationandSustainability,1405S.HarrisonRoad,Suite115ManlyMilesBldg.,MichiganStateUniversity,EastLansing,MI48823-5243,USA.Tel.:+15174325074;fax:+15174325066.E-mailaddress:tuanmuma@msu.edu(M.-N.Tuanmu).RSE-07636;NoofPages120034-4257/$–seefrontmatter©2010ElsevierInc.Allrightsreserved.doi:10.1016/j.rse.2010.03.008ContentslistsavailableatScienceDirectRemoteSensingofEnvironmentjournalhomepage::Tuanmu,M.-N.,etal.,Mappingunderstoryvegetationusingphenologicalcharacteristicsderivedfromremotelysenseddata,RemoteSensingofEnvironment(2010),doi:10.1016/j.rse.2010.03.008signalsreceivedbyremotesensors,itsrelativecontributionstothesignal
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