基于MODIS數(shù)據(jù)的北京地區(qū)植被凈第一性生產(chǎn)力估算研究.pdf

1、中國農(nóng)業(yè)大學碩士學位論文基于MODIS數(shù)據(jù)的北京地區(qū)植被凈第一性生產(chǎn)力估算研究姓名：孔艷榮申請學位級別：碩士專業(yè)：土地利用與信息技術(shù)指導教師：孫丹峰20060501AbstractThispaperdescribesamethodofintegratingremotesensingdata，groundmeteorologicaldataandothervegetationecophysiologicaldatatoestimateNP

2、PinBeijingAfterthecomparisonandvalidationwithobserveddataandotherNPPmodelstheNPPtimeseriesofBeijingat2000yearisbuiltThespatio—temporalW|ri砒io璐andthepotentialtrendofNPPareanalyzed，F(xiàn)romtheseresearchessomebasicconclusiona增d

3、rawnasfolIows：lNPPestimarionmodelTheestimationmodelofNPPinthispapercallbecharacterizedintwoways(i)Thecomputationofthewaterrestriction最c缸isrelativelyeasyandsimpleItisdrivenwithgroundmeteorologicaldataandremotesensingdataa

4、ndthecomplexsoilparametersareavoided(ii)Thevegetationtypesisin訂oducedtothecomputationofsomekeyvegetationparameters，suchasthemaximumvalueofNDVIandthesimpleratio(SR)Thiscanremovesomenoisefromtheremotesensingdataandthestati

5、sticerrorsofvegetationelassifieation2ValidatethemodelandspatiotemporalvariationsofNPP(1)VaildatethemodelTheaveragevalueofNPPofthismodelis6527435gC／m／yrwhichisvariouslylowerthanthevalueofestimationmodelofMiamiandThomthwai

6、te(2)Spatio—temporalvariationsofNPPThetotalNPPofterrestrialvegetationinBeijingis1447669tgCat2000yearThebiggestaveragevalueofBeijingisarriveto7839C／m2ThereareclearlystrongregionalvariationsinBeijingterrestrialvegetationNP

7、PItincreasedfromSoutheastBeijingtowardthenorthwestRegionsofhigherproductivityarefoundinHuairou，Mentougou，northeastYanqing，westenFangshanandmostofChangping，whereasthecityzonehasverysmallNPPvalues3MainresearchproductsAseri

8、esofdatarelatedtotheestimationofNPPwascollectedandthedatabasewasbuiltA11thesedatawerevalidatedwiththemissingandsuspiciousdataeliminatedTheimageswererectifiedtothereferencetopographicmapandhadthesamecoordinate，rowsandsamp