基于遙感技術(shù)的祖厲河流域土地利用-土地覆蓋變化與蒸散發(fā)研究.pdf

1、蘭州大學(xué)博士學(xué)位論文基于遙感技術(shù)的祖厲河流域土地利用土地覆蓋變化與蒸散發(fā)研究姓名：韓惠申請(qǐng)學(xué)位級(jí)別：博士專業(yè)：地理學(xué)自然地理指導(dǎo)教師：馮兆東20060501InvestigationofLUCCandETinZuliRiverBasinoftheLoessPlateauUsingRemotelySensedDataABS丁RACTZulibasin。locatedinthewestoftheLoessPlateau，iSoneofpoo

2、restregionsinChinaLanddegradation，especiallyseveresoilerosion，adverselyinfluencestheecosysteminthebasinInthisthesis，remotesensingisusedtoderivenotonlytheinformationaboutlandUseandLandCoverChangeGucc)，butalsothesurfacevar

3、iablesforevaluatingregionalevapotranspiration(ET)Themainresearchesincludetwoparts：1BasedonLandsatseriesimagesin1978，1993，1998，2001and2003，PrincipalComponentsAnalysis(PCA)isusedotransformtheoriginalimagetothenewbandcombin

4、ationDuetothedistinctivedistributionofdifferentlandusesinTsNDVIspace，TsandNDVIiarepartitionedintothefirstthreePCAcomponentstoclassifylandusesandlandcoversandLULCmaDsarecreatedforeachofthefivestudiedyearsTheLULCmapsshowth

5、atfarmlandacreageincreasedfirstandthendecreasedduringthestudy，period(19782003)，whilegrasslandacreagedecreasedfirstandthenincreasedduringthesalneperiodAfteranalyzingtherelationshipsbetweenLUCCandnaturalandhumanfactorsitiS

6、concludedtatthemainreasonofLUCCiSpolicyorientationtowardsmebalancebetweeneconomyandecologyThatiS，thedocumentedfarmlandacreageincreasefrom1978to1998wascausedby‘privatization”policyandthedecreasefrom1998to2003Wasrelatedto“

7、ecologicalrestoration’’policy2SEBAL(SurfaceEnergyBalanceAlgorithmforLand)，aTM—basedETmodel，isselectedtoderivethesurfacebiophysicalparameterssuchasNDVI，emissivity瓦andothersThenetradiation，soilheatfluxandsensibleheatfluxar

8、ethenestimatedbasedonthesurfacebiophysicalparametersanddailyETiscalculatedusingenergybalanceequation。Wi搬aidofobservedclimatedataFAOPenmanMonteithequaptionisusedtocalculatethereferenceETandcropeoemcientThen，basedonthecalc