简介:ThecalculationofEcologicalFootprint(EF)onthebasisofInput-Outputmodel(I-Omodel)wasadvancedbyBicknell,andmodifiedandimprovedbyFerngwhocorrectedthefootprint'saggregationtoeachsectors.Forthelackofsufficienttechniquetodealwiththetradebetweentheresearchareasandtherestoftheworld,itisnecessarytoimprovethismethod.AndadynamicanalysisofthechangeoffootprintbasedonI-Omodel,whichcouldexplorethefactorimpactingthefootprintusingthespecialadvantageofI-Omodel,oughttobeputintopractice.Afterintroducingthenewmethodindetail,wecalculateandcomparetheEFandthechangeofGansuProvinceinthenorthwestofChinain1997and2002.TheresultshowsthattherewasanincreaseofEFin2002causedbyfinaldomesticdemand.Further,theincrementinEFexportwas2.0×105haand1.6×106hainimport.Theout-of-regionsupportdroppedfrom22.6%to18.6%.WeintroducethreefactorscausingtheEFchangebasedonthecharacterofI-Omodel:theproductivityoftheresourcewhichisexplainedbythechangeofresourceusedtoobtainoneunitoutputinasector,theimprovementoftheeconomicsandthefinaldemand.Finally,wefindthattheeffectsofthethreefactorsontheEFchangearenotidenticalexcepttheindustrysectorsandthechangeoffactorsintheagricultureandtheindustrysectorsworksnotably.