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:1672643X(2023)03008310
Vegetationchangeanditsresponsetomultitimescale
meteorologicaldroughtsintheHanjiangRiverBasin
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HEHaoshen,PENGTao ,YOUXingying,LIUBojuan,DONGXiaohua ,
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LIUJi ,LINQingxia ,GUOJiali
(1.CollegeofHydraulicandEnvironmentalEngineering,ChinaThreeGorgesUniversity,Yichang443002,China;2.Engineering
ResearchCenterofEcoenvironmentintheThreeGorgesReservoirRegion,MinistryofEducation,Yichang443002,China;
3.HubeiHanjiangXinglongWaterControlProjectAdministrationBureau,Qianjiang433126,China;
4.HubeiInstituteofWaterResourcesSurveyandDesign,Wuhan430070,China)
Abstract:Droughtisoneoftheimportantfactorsaffectingvegetationgrowth,sothestudyofvegetation
responsetodroughtatdifferenttimescalesisofgreatsignificance.Thestandardizedprecipitationindex
(SPI),vegetationconditionindex(VCI)andfractionalvegetationcover(FVC)atdifferenttimescales
werecalculatedandthespatiotemporalchangeofvegetationanditsresponsecharacteristicstomultitime
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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