Page 220 - 《水资源与水工程学报》2022年第5期
P. 220

! 33 " ! 5 #                      & ' ( ) & * + , -                               Vol.33No.5
               2022 $ 10 %              JournalofWaterResources&WaterEngineering                 Oct.,2022

            DOI:10.11705/j.issn.1672-643X.2022.05.27


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                                     3
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                 HIJKL:S274   MNOPQ:A    MRSL:1672643X(2022)05021609

                          Wateruseefficiencyevaluationinpaddyricefieldbased
                                       onblueandgreenwateraccounting

                                  JIANGQiwei,LIYueyao,WUMengyang,CAOXinchun
                           (CollegeofAgriculturalScienceandEngineering,HohaiUniversity,Nanjing210098,China)

                 Abstract:Inordertoaccuratelydifferentiateandevaluatetheefficiencyofblueandgreenwaterusein
                 paddyricefields,theblueandgreenwaterdifferentiationmodelandwateruseefficiencyevaluationindex
                 systemwereestablishedbasedonthedailyexperimentalobservationofblueandgreenwaterinteraction
                 migrationprocessduringthewholecropseason.BlueandgreenwateruseofpaddyfieldsinNanjing,
                 Chinaunderdifferentprecipitationconditionswererevealed.Resultsshowedthatannualfieldwaterin
                 flowin2015-2018wasmeasuredtobe1 ,322.9mm(30.7% blue),572.3,246.0,and375.2mm
                 ofwhichweredischargedinformsofsurfacedrainage ,evapotranspirationandleakage.Green(GE)
                 andblue(BE)waterefficiencyinthewholegrowthperiodwerecalculatedas0.425and0.490,re
                 spectively,bothofwhichweresignificantlyhigherindroughtyearsthaninwetyears.Netblue(BP)
                                                                        3
                 andgreen(GP)waterproductivitywere4.334and2.301kg/m,respectively,andthelatterwasin
                 significantlyaffectedbyprecipitation.BEandGPobtainedbyconventionalmethodwere46.2% and
                29.7% higherthanthosecalculatedbytheproposedmethod.Fieldirrigationefficiencywouldbeoveres
                 timatedandthecontributionofprecipitationincropproductionwouldbeunderratediftheinteractiveblue
                 andgreenwatermigrationprocesswasignored.Themethodandresultsofthisstudycanprovideanew
                 approachfortheevaluationofcropwaterfootprintandagriculturalblueandgreenwateruseefficiency.
                 Keywords:watersavinginagriculture;blueandgreenwater;wateruseefficiency;evaluationindex;
                 paddyrice



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