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                         AssessmentofcomprehensiveintensityofecologicalDroughtinsummerand
                                   autumninsixprovinces (city)ofYangtzeRiverBasin

                                                               1,2
                                                                                               3,4
                                      1,2
                                                    1,2
                                                                             3,4
                        JIANGTianliang ,QUYanping ,LJuan ,SUXiaoling ,DONGRongrong
                               (1.ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100038,China;
                                2.ResearchCenteronFloodandDroughtDisasterReduction,Beijing 100038,China;
                         3.SchoolofWaterConservancyandCivilEngineering,NorthwestA&FUniversity,Yangling 712100,China;
                              4.KeyLaboratoryofAridAreaAgriculturalWaterandSoilEngineering,MinistryofEducation,
                                           NorthwestA&FUniversity,Yangling 712100,China)
                  Abstract:TheseveredroughtintheYangtzeRiverBasinsinceJune2022hashadasignificantimpactonagricul
                  ture,energy,andecology.OnAugust11,theMinistryofWaterResourceslaunchedalevelIV responseto
                  droughtinAnhui ,Jiangxi,Hubei,Hunan,Chongqing,andSichuanprovinces,whicharethemostseverelyaf
                  fectedareasoftheYangtzeRiverBasin.Atpresent,therearefewstudiesonthequantitativeassessmentofecologi
                  caldrought.Inviewofthis ,thestandardizedecologicalwaterdeficitindexwasconstructedtoevaluatetheimpact
                  ofdroughtontheterrestrialecosysteminsixprovinces (city).Modifiednormalizedwaterdifferenceindexwasused
                  toevaluatetheitsimpactonaquaticecosystem.Then ,theinterannualvariationofcomprehensiveintensityofecologi
                  caldroughtinthestudyareawascalculatedbasedonthecharacteristicsofdroughtevents.Finally ,thereasonforec
                  ologicaldroughtin2022wasdiscussed.Theresultsshowedthat :(1)Juneistheinitialstageofecologicaldrought.
                  FromJulytoSeptember,theseverityandaffectedareaofterrestrialecologicaldroughtareincreasing.Astherainfall
                  increasedandvegetationwaterrequirementsdecreasedfrom OctobertoNovember ,droughtseverityreleased.(2)
                  Duringtheperiod1982to2022,comprehensiveintensityofecologicaldroughtinstudyregionexperiencedanincreas
                  ingandfluctuatingtrend.In2022,theproportionofhigh - intensityareasreacheditshighestlevelsince1982,which
                  was67.4% higherthanthehistoricalaverage.(3)EcologicaldroughtfromJunetoNovember2022,themostseri
                  oussince1982,wascausedbythelowintensityofecologicalwatersupplyandthehighintensityofecologicalwater
                  demand,whichinducedbylessprecipitationandsurfacewater,andlonghightemperaturedays,respectively.
                  Keywords:YangtzeRiverBasin;ecologicaldrought;evolutioncharacteristic;comprehensiveintensityofdrought

                                                                                    (责任编辑:耿庆斋)

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