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简介：Energyespeciallyforrapidelectricityconsumptionincreasingisanobviousproblemduringtheprocessofurbanizationandeconomicgrowth.Itisalsoanimportantresearchfieldtoexploreintrinsicregularpatternofelectricityconsumptionandprovidesolvingapproaches.Firstly,thispaperstudiestherelationshipbetweenelectricityconsumptionandurbanizationviaGMMmodelbystagesandregions.Theresultsshowthatthemostobviousstageofurbanizationonelectricityconsumptionisthestagebetween1992-2000.Theresidents’incomehasanevidentinfluenceonelectricityconsumptionofeastregionandindustryalsohasgeneratedstrongerdrivingforceincentralandwestregions.Thenthepaperanalyzestherelationshipbetweenurbanizationandelectricityconsumptionbyimpulsefunctionandgraycorrelation,andthevariablesofurbanizationandindustrializationbothhavevariouspositiveimpulseeffect.Estimatingthegraycorrelation,centralprovinceswithhighpopulationdensityandlargesharesofindustryhavehighcorrelationdegreeinurbanizationandelectricityconsumption.

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简介：Inthisresearch,fiveplotsareselectedbasedonstandstorageandproductivityofplantedforestofLarixkaempferi(Japaneselarch)aswellastheirrelationshipwithfactorssuchasforestage,siteconditionandstandden-sity.Throughstandardplotinvestigationandmethodoftrunkanalysis,systematicresearchisconductedonstorageandproductivityoftheplantedforestandtheirrelationshipwithsitecondition.Asshownintheresearch,produc-tivityofplantedforestofLarixkaempferiinlowlatitudeareaishigherthanthatinhighlatitudeareawhilestandproductivityishigherinslightacidsoil.Contentsofpotassiumelementinthesoilhaveconsiderablein?uenceonproductivityoftheLarixkaempferiforest.

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简介：Cityisacouplingsystemofeconomy,societyandenvironment.Theurbanenvironmentisasupportingsystemtothesustainabledevelopmentofcity.TakingtheurbanareaofChongqingasanexample,thispaperestablishestheindicatorsystemforassessmentofthecoordinationbetweenurbanenvironmentandeconomyaccordingtotheresultfromprincipalcomponentanalysesbysoftwareSPSS11.0.Meanwhile,theweightwasassignedforeachindicatorbasedontheloadofthefirstproperprincipalcomponents.Throughcomputationofthecoordinateddevelopmentmodelsetupaccordingtotheknowledgeofstatistics,thepaperdrawstheconclusionthatthesituationofthecoordinationbetweenenvironmentandeconomyinChongqingdevelopedwellfrom1996to2004.Finally,countermeasuresforthecoordina-tioninthecomingyearsareproposed.

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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.