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                            Theresponserelationshipofclimate - vegetationphenology - runoffin
                                              hillyareaofHaiheRiverBasin

                                                               1
                                                  1
                                                                            1
                                                                                        1
                                 1
                     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


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