Page 43 - 《水资源与水工程学报》2022年第1期
P. 43

!33 " ! 1 #                       & ' ( ) & * + , -                               Vol.33No.1
               2022 $ 2 %               JournalofWaterResources&WaterEngineering                 Feb.,2022

            DOI:10.11705/j.issn.1672-643X.2022.01.06


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                 BCDEF:P339   GHIJK:A    GLMF:1672643X(2022)01003907
                ChangesofevapotranspirationandthecausesintheBeichuanRiverBasin
                  oftheupperYellowRiverundertheinfluenceofvegetationrestoration


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                                        1
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                         YANGMingnan,ZHULiang ,LIUJingtao ,ZHOUBing ,CHENXi
              (1.InstituteofHydrogeologyandEnvironmentalGeology,ChineseAcademyofGeologicalSciences,Shijiazhuang050061,China;
                 2.KeyLaboratoryofGroundwaterPollutionMechanismandRestorationofHebeiProvince,Shijiazhuang050061,China;
                                   3.ChinaUniversityofGeosciences(Beijing),Beijing100083,China)
                 Abstract:TargetingtheeffectofvegetationrestorationonthewatercycleintheupstreamofYellowRiv
                 er ,basedonthevegetationcoverage,remotesensingandfieldobservationdataoftheevapotranspiration
                 inthetheBeichuanRiverBasin ,theevolutiontrendofevapotranspirationandthecausesofitschanges
                 wereanalyzedtoinvestigatethepotentialinfluencingpathofthevegetationrestorationinalpinemountain
                 ousareaonthechangesofevapotranspirationonthebasinscale.Theresultsshowthattheevapotranspi
                 rationdecreasedby33.23mminBeichuanRiverBasinfrom2000to2019duetothecontinuousincrease
                 ofthevegetationcoverage.ThereductionofevapotranspirationinJulyandAugust ,whichisthemain
                 vegetationgrowthseason ,dominatedtheannualreduction.DuringtheperiodofJunetoSeptember,
                2019,thesoilevapotranspirationintheforestwas207.38mm,whichwas157.53mmlowerthanthat
                 outsidetheforest ,thiswasalsoconducivetothedecreaseofevapotranspirationinthebasin.Meteorologi
                 calfactorssuchassurfacewindspeed,whichweregreatlyinfluencedbyvegetation,playedanimportant
                 roleinthereductionofthepotentialevapotranspirationstrengthinthebasin.Thevariationtrendofevap
                 otranspirationinalpinemountainousareainthebackgroundofvegetationrestorationwasdifferentfrom

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