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Theresponserelationshipofclimate - vegetationphenology - runoffin
hillyareaofHaiheRiverBasin
1
1
1
1
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HANShuying,WANGQingming,ZHAOYong,ZHAIJiaqi,LIHaihong,LIUKuan 2
(1.ChinaInstituteofWaterResourcesandHydropowerResearch,StateKeyLaboratoryofSimulationandRegulationof
WaterCycleinRiverBasin ,Beijing 100038,China;
2.StateKeyLaboratoryofHydraulicEngineeringSimulationandSafety,TianjinUniversity,Tianjin 300072,China)
Abstract:Theadvanceofvegetationphenologyleadstoanincreaseinevapotranspirationintheriverbasin,which
affectsthehydrologicalprocessesoftheriverbasin ,especiallyinthehillyareaofHaiheRiverBasinwhererunoff
attenuationissevere.Studyingthecouplingrelationshipbetweenclimate ,vegetationphenology,andrunoffisof
greatsignificance forelucidating the reasonsbehind runoffattenuation and optimizing ecologicalprotection
measures.Thisstudyfocusedon17smallriverbasinsinthemountainousareasoftheHaiheRiverBasin.Basedon
agreyrelationalmodel ,therelativecontributionsofvegetationfactors(vegetationphenologyandNDVI)andcli
matefactorstorunoffduringthe1982 - 2020growingseasonwereanalyzed.Thestructuralequationmodelwasused
tofurtherexplorethemultipleregulatorymechanismsofclimatevegetationphenologyrunoffduringthespring (au
tumn )season.Theresultsshowthat:①Over87.5% ofthestudyarea’sgrowthseasonhadbeenextended,with
anaverageextensionof0.42d?a.② Thegreycorrelationdegreeresultsshowthat,precipitation(0.7)andsoil
moisture(0.69)arethefirstandsecondinfluencingfactorsonrunoff.Nextisvegetationphenologyinspringand
autumn(both0.63),whoserelativeimportanceexceedsclimatefactorssuchastemperatureandsolarradiation.
③Thepathwaysofclimate - vegetationphenology - runoffwithdifferentvegetationcovertypesinspringandautumn
exhibitedinconsistentresults.Inspring ,warmertemperaturesledtoearlierspringphenology,whichincreased
evaporationandreducedrunoff.Inautumn ,precipitationandsolarradiationdrivephenologicalchanges,resulting
inchangesinevaporationandrunoff.Thestudycontributestoimprovingtheunderstandingoftheresponserelation
shipbetweenvegetationandwaterresourcesevolutionintheHaiheRiverBasinunderthebackgroundofclimate
change.
Keywords:vegetationphenology;runoff;climatechange;HaiheRiverbasin;hillyarea
(责任编辑:耿庆斋)
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