学科分类
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31 个结果
  • 简介:Climatechangeisexpectedtobeamajordrivingforceoflandscapeinthecomingdecades.Itwillhaveamultitudeofpotentialimpactsthatvaryinintensityandeffectaccordingtoregionandsector.Inthecontextofglobalwarming,theclimateofChinahaschangedsignificantlyintherecent100years.ThereasonforclimatechangeinChinaismainlyduetoirrationallandusecausedbyhumanactivities,whichchieflyresultsintherapidindustrializationandurbanizationprocess.Basedonanassessmentmodel,thisresearchrepresentsapictureoftheimpactsofclimatechangeinsixdistrictsofHangzhouregion.Theaimofthispaperistoconclude,ontheonehand,someofHangzhousensitivitiesinrelationtotheprimaryeffectsofclimatechange.Ontheotherhand,areflectionismadeonamethodologytoformulatepreconditionsonascientificbasisforfurtherresearchbydesignofintegratedadaptationoptionsforthefuturespatialdevelopmentsinfunctiontoupgradeHangzhouresilienceinrelationtoclimatechangechallenges.

  • 标签: CLIMATE CHANGE IMPACT Hangzhou
  • 简介:Forrecentyears,runoffgenerationandhydrologicalprocessesinHailiutuRiverbasinhavebeengreatlychangedbyclimatechangeandhumanactivity,especiallywaterandsoilconservationconstruction.Inthisstudy,thetrendsinprecipitation,evapotranspiration(ET)andriverrunoffaswellastheeffectsofprecipitationchangeandhumanactivityonrunoffvariationhavebeenstudied.Theresultsshowedthatduring1960-2000,annualprecipitationandriverrunoff,monthlyprecipitationandETinSeptemberandOctoberaswellasmonthlyrunoffinallmonthsshowedasignificantdecrease.Inaddition,peakflowandbaseflowhadalargedecrease.Underthejointinfluenceofprecipitationchangeandhumanactivity,themeanannualrunoffdecreasedby35millionm3fromthebaselineperiod(1960-1985)tothechangeperiod(1986-2000),whichaccountedfor60.9%and39.1%ofthetotalrunoffdecrease,respectively.Precipitationchangeplayedaprimaryroleinthedecreaseofannualrunoffwhereashumanactivity,particularlywaterandsoilconservationconstruction,alsohadremarkableimpactsonrunoffvariation.

  • 标签: RUNOFF VARIATION PRECIPITATION CHANGE human activi
  • 简介:Climatechangehasbecomewidelyacceptedasachallengethathumanswillfaceinthenot-too-distantfuture.Mountainecosystemsandtheirinhabitantsareamongthemostvulnerabletoclimatechange.ThispaperseekstoexplainmigrationdriversinspecificmountainregionsinthecontextofclimatechangebasedonForesight’sconceptualframework.AclimatechangesensitivefieldnamedShangnanCountyinsouthernShaanxiProvinceischosenasthecasestudyareatoinvestigatelocalmigrationdrivers.Aseriesofqualitativeresearchmethodsisemployedinthecasestudyincludingparticipantobservation,semi-structuredinterviews,andfocusgroupdiscussions.Theevidenceofsurveysuggeststhatmigrationdecisionsarenotonlyshapedbymacrofactorsinaspectsofenvironmental,economics,demographic,social,politicsandpsychological,butalsoinfluencedbyplaced-relatedbarriersandfacilitatingmechanismsandpersonalcharacteristics.

  • 标签: climate change MIGRATION DRIVER MOUNTAIN region
  • 简介:TheruralsettlementsaccountedforagreatproportionofoverallbuildinglandinChina,butitstillexpandedinrecentyearsalongwithurbanizationandgraduallydecreasingruralpopulation.Toexplorethereasonforthisphenomenon,ananaly-sishasbeenmadebasedontheinvestigationinatraditionalagri-culturalregion.Thisstudyfoundthatsocioeconomicfactors,in-cludingthescaleoffamiliesanditsquantity,theimprovementofruralpublicinfrastructure,thechangeofpopulationandthepres-sureofarableland,haveeffectsontheexpansion.Theviewonlandtenurewhichhasshapedinfarmersmindsinthelonghaulmakesthemdisposetheirhousescautiously,andthiswasthemaincauseofthefactthatonehouseholdownmorethanoneplot.Inaddition,thelimitationsofrurallandinstitutionareunconducivetoinspiritingthetransferoffarmers'buildinglandandredevel-opmentoftheidlehousingland.

  • 标签: 农村 经济发展 经济结构 转换模式
  • 简介:China’stechnologicaleffortstotackleclimatechangehavelastedformanyyears.Itisnecessarytotesttheeffectoftheseeffortswithquantitativemethod.Tobeexact,whetherandhowChina’slow-carbontechnologyinnovationrespondstoclimatechangeshouldbetested.Basedonthe2004-2015paneldataof30provincesinChina,weusethemethodofESDAanalyzingthespatialcorrelationofChina’slow-carboninnovationtechnology.Furthermore,weusethespatialDurbinmodelempiricallyanalyzingthespatialspillovereffects.Theresultsobtainedareasfollows:first,supplyanddemandofChineselow-carboninnovationhassomedeviationinthespatialdistribution.Thelow-carbontechnologyinnovationasthesupplyfactorshowsthecharacteristicsofexpandingfromtheeasttothewest.InnovationineasternChinahasalwaysbeenthemostactive,butinnovativeactivitiesinthemiddleandwesternChinaaregraduallydecreased.However,carbonemissionshavethecharacteristicsofmovingwestward,implyingthechangeoftechnologydemanddifferentfromtechnologysupply.Second,China’slow-carboninnovationactivelyrespondstothetrendofclimatechange,indicatingChina’stechnologicaleffortshavepaidoff.However,thespatialspillovereffectsarenotsignificant,showingthattheeffortsineachregionofChinastillworkforhimself.Third,environmentalregulationandmarketpullareimportantfactorsforlow-carbontechnologyinnovation.Amongthem,bothsupportingpolicyandinhibitorypolicyhavesignificantimpactonthelocallow-carbontechnologyinnovation,butnosignificantspatialspillovereffects.Itshowsthatenvironmentalpoliciesindifferentregionsarecompetitiveandlackofdemonstrationeffects.Economicgrowthandexportasmarketpullhavehigherlevelofeffectonlow-carbontechnologyinnovationforbothlocalandadjacentareas.Somepolicyimplicationsareproposedbasedontheseresultsfinally.

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  • 简介:Studyingtheprocessandcharacteristicsofurbanlandchangeindifferentphasesofurbanizationanddifferenteconomicdevelopmentismuchimportantforunderstandingurbanlandchangeandmanagementatamacrolevel.TakingtheexampleofJiangsuProvince,thepresentpaperstudiedthecorrelationbetweenurbanlandchangeprocessandsocioeconomicdevelopmentfrom1981to2003onthebasisofstatisticaldata.Theresultsshowedthefollowingthreeaspects.First,urbanlandareahaschangedperiodicallyandtheresearchdurationcanbedividedintotwoperiods:from1981to1994andfrom1995to2003.Ineachperiod,thechangingtrendisthesame,i.e.slowatfirstandthenquick.Studyingfromthecomprehensivechangestatus,thecharacteristicoffluctuantchangeissignificantwiththreeacutechangepinnaclesin1988,1991and2002whichwerecorrespondedtoturningpointyearsofeconomicdevelopmentphasesofJiangsuProvincerespectively.Second,thesynchronizationbetweenurbanlandchangeandurbanizationlevelchangeisnotstrict.Withtheevolutionofurbanizationphases,thechangepaceofurbanizationlevelincreasedremarkably,buturbanlandchangeratedidnotincreasesignificantlyaccordingly.Third,theareaofurbanlandhasexponentiallyincreasedwiththeincreaseofpercapitaGDP.IndifferenteconomicdevelopmentlevelsclassifiedbypercapitalGDP,landresourcecostforeconomicdevelopmentisdifferent,respectively29.01hm2,26.34hm2,26.22hm2,and11.14hm2fortheincreaseof100millionRMBGDPwhenthepercapitaGDPisunder1000,1000–2000,2000–5000andover5000RMB.

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  • 简介:Land-usechangeisanimportantaspectofglobalenvironmentchange.Itis,inasense,thedirectresultofhumanactivitiesinfluencingourphysicalenvironment.Thispaperanalyzedtheland-usechangeinNortheastChinaduring1985-2000basedonLandsatTMimages.ItdividesNortheastChinaintofiveland-usezonesbasedonthedynamicdegreemodelofland-use:woodland/grassland-arablelandconversionzone,dryland-paddyfieldconversionzone;urbanexpansionzone,interlockedzoneoffarmingandpasturingandreclamationandabandonzone.Thefindingsincludetheobviousincreaseofcroplandarea,paddyfieldanddrylandincreasedby75and276thousandhm2respectively;urbanareasexpandedrapidly,areasoftownandruralresidenceincreasedby76.8thousandhm2;areasofforestsandgrasslanddecreasedsharplywiththeamountsof1399and1521thousandhm2respectively;areasofwaterbodyandunusedlandincreasedby148and514thousandhm2respectively.Thispaperalsodiscussesthedriving

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