Page 87 - 《水资源与水工程学报》2023年第3期
P. 87

!34 " ! 3 #                       & ' ( ) & * + , -                               Vol.34No.3
               2023 $ 6 %               JournalofWaterResources&WaterEngineering                 Jun.,2023

            DOI:10.11705/j.issn.1672-643X.2023.03.10


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                 ABCDE:P426.616   FGHIJ:A    FKLE:1672643X(2023)03008310
                            Vegetationchangeanditsresponsetomultitimescale

                             meteorologicaldroughtsintheHanjiangRiverBasin

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                       HEHaoshen,PENGTao ,YOUXingying,LIUBojuan,DONGXiaohua ,
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                                                 1,2
                                           LIUJi ,LINQingxia ,GUOJiali
              (1.CollegeofHydraulicandEnvironmentalEngineering,ChinaThreeGorgesUniversity,Yichang443002,China;2.Engineering
                 ResearchCenterofEcoenvironmentintheThreeGorgesReservoirRegion,MinistryofEducation,Yichang443002,China;
                        3.HubeiHanjiangXinglongWaterControlProjectAdministrationBureau,Qianjiang433126,China;
                               4.HubeiInstituteofWaterResourcesSurveyandDesign,Wuhan430070,China)
                 Abstract:Droughtisoneoftheimportantfactorsaffectingvegetationgrowth,sothestudyofvegetation
                 responsetodroughtatdifferenttimescalesisofgreatsignificance.Thestandardizedprecipitationindex
                 (SPI),vegetationconditionindex(VCI)andfractionalvegetationcover(FVC)atdifferenttimescales
                 werecalculatedandthespatiotemporalchangeofvegetationanditsresponsecharacteristicstomultitime
                 scalemeteorologicaldroughtswereanalyzedbasedonthemonthlyprecipitationandnormalizeddifference
                 vegetationindex (NDVI)dataoftheHanjiangRiverBasin(HRB)from 1982to2019.Theresults
                 showedthatNDVIinthegrowingseasonoftheHRBshowedanupwardtrendandFVCwasspatiallyhigher
                 inthewestandlowerintheeast.Withtheincreaseofthetimescale,thealternatingfrequencyofdryand
                 wetcycledecreased,indicatingthatthesensitivityofdroughteventstoprecipitationdecreased.Accord
                 ingtothedroughttrend ,37.62% and62.38% oftheregionsshowedanupwardanddownwardtrendre
                 spectively.Fromtheperspectiveofdroughtfrequency,highfrequencydroughteventsineachseasonwere
                 concentratedinthemiddleandeastofthebasin.Attheannualscale,therewasanegativecorrelation

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