Thecomparativestudyontheecologicalsensitivityanaly

1878-0296©2010PublishedbyElsevierdoi:10.1016/j.proenv.2010.10.043Availableonlineat(2010)386–398InternationalSocietyforEnvironmentalInformationSciences2010AnnualConference(ISEIS)ThecomparativestudyontheecologicalsensitivityanalysisinHuixiankarstwetland,ChinaZHANGMingwua,,JINHaijiangb,CAIDesuoc,d,JIANGChunboaa.StateKeyLaboratoryofHydroscienceandEngineering,TsinghuaUniversity,Beijing100084,Chinab.HaikouUrbanPlanningandDesignResearchInstitute,Haikou5700105,Chinac.CollegeofCivilandHydroelectricEngineering,ChinaThreeGorgesUniversity,Yichang443002,Chinad.CollegeofCivilEngineeringandArchitecture,GuangxiUniversity,Nanning530004,ChinaAbstractThispaperappliestwomethodstoanalyzetheecologicalsensitivityinHuixianwetland,(Guangxiprovince,China).Theonemethod(theecologicalunitmethod)isthattheHuixianwetlandreserveisdividedintoseveralecologicalunitsaccordingtodifferentgeographicconditionandagriculturalstructure;themainfactorsofecologicalsensitivityareselected;DelphiandAnalyticalHierarchyProcess(AHP)areappliedtodetermineevaluationfactorsandtheweightofeachfactor;atlast,IndexAccumulationMethod(IAM)isadoptedtoevaluatetheecologicalsensitivity.Theothermethod(theGISmethod)isthatusingecologicalsensitivityindexesandGISspatialanalysismodule,makesacomprehensiveevaluationoftheecologicalsensitivityinHuixianwetland.Theresultsoftheecologicalsensitivityanalysisshowthatthemostsensiblezoneliesinthecentreofthewetlandreserve,whichcanbesettothecoreprotectionarea.Thehighsensibilityzoneisaroundthecoreprotectionarea,whichcanbesettothebufferzoneorexperimentalzone.Thelowestsensibilityzoneislocatedintheeastofthewetlandreserve,whichcanbesettothedemonstrationarea.Thecomparedresultsofthetwodifferentmethodsshowthatthefirstmethod,theecologicalunitmethod,canbeusedincaseofcomparativeshortageofexistingdata.Theecologicalsensibilitydistributionisrelativelyexplicit.Thesecondmethod,theGISmethod,canbeusedincaseoftheabundantRemoteSensing(RS)andgeographicinformationsystems(GIS)data.Theanalyticalresultsaremeticulousandobjective.Theecologicalsensibilitydistributionisrelativelyimplicit.©2010PublishedbyElsevierLtd.Keywords:Ecologicalsensitivityanalysis;GIS;Wetland1.IntroductionHuixianwetlandwhichbelongstoLacustrinewetlandiscurrentlythelargestoneofthistypeofwetlandsinGuangxiandisalsothetypicalwetlandinkarsttopographyofGuangxi.HuixianwetlandislocatedinLinguiCorrespondingauthor.Tel.:+0086-0l0-62771820.E-mailaddress:[e-mail]./ProcediaEnvironmentalSciences2(2010)386–398387CountyandYanshanDistrictofGuilin,Guangxi.Thewetlandislocatedineastlongitude110°08ƍ38Ǝ~110°16ƍ57Ǝ,northlatitude25°05ƍ08Ǝ~25°08ƍ34Ǝ.GeographicallocationofHuixianwetlandisshowninFig.1.Fig.1.GeographicalmapofHuixianwetlandSince1950s,withtheincreaseofhumanactivitiesandwetlandreclamation,andwiththelackofeffectivemanagementandprotection,theoriginalwetlandhasbeencontinuouslyundermined;thewaterhasgraduallybeenshrinking;andwetlandecosystemshavebeenseriouslydamaged.Atpresent,thelargegrassyareasaroundJiutouMountainandFenghuangMountainwereopeneduptoabout2000muoffarmland.ThemarshesaroundDulongPond,JiutouMountain,FenghuangMountainandLongMountainareexcavatedtoabout4200muoffishponds.ThestatusoflandusinginHuixianwetlandreserveisshowninFig.2.Fig.2.StatusoflandusinginHuixianwetlandreserveInresentyears,therearemoreandmorestudiesonHuixianwetland.WithaseriesofremotesensingdatainHuixianwetlandreserve,CaiDesuo,MaZuluetal[1]usedGIStechniquetoanalyzethespatio-temporalevolutionofthewetlandsform1969to2006.Lishijie,CaiDesuoetal[2]studiedpreliminarilyontheenvironmentchangesrecordderivedfromsedimentcoresofHuixiankarstwetland.FrameworkofEstablishmentofHealthassessment388ZhangMingwuetal./ProcediaEnvironmentalSciences2(2010)386–398PrograminLijiangRiverWatershedCaiDesuo,WangBeixinetal[3]studiedtheaquaticecosystemhealthmonitoringandevaluationsystemofthewholeLijiangRiverwatershed.Eco-environmentalsensitivityevaluationisanimportantpartofplanningofHuixianwetland,whichhasaguidingroleinecologicalfunctionzoning.Therearealotofresearchesontheevaluationofecologicalenvironment[4-11].ThispaperappliestwomethodstoanalyzetheecologicalsensitivityinHuixianwetland,anddoescomparativeresearchofthesetwomethods.Theonemethod(theecologicalunitmethod)isthattheHuixianwetlandreserveisdividedintoseveralecologicalunitsaccordingtodifferentgeographicconditionandagriculturalstructure;thenthemainfactorsofecologicalsensitivityareselected;Delphi[12]andAnalyticalHierarchyProcess(AHP)areappliedtodetermineevaluationfactorsandtheweightofeachfactor;andIndexAccumulationMethod(IAM)isadoptedtoevaluatetheecologicalsensitivity.Theothermethod(theGISmethod)isthatusingecologicalsensitivityindexesandGISspatialanalysismodule[13,14],makesacomprehensiveevaluationoftheecologicalsensitivityinHuixianwetland.2.MethodsandApplications2.1.Methodone:EcologicalunitmethodEcologicalsensitivityisdefinedastheadaptabilityofecologicalfactorstotheexternalpressureorexternalinterferenceunderthepremiseofnolossorreductioneco-envi