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                          Optimizationofplantingstructureinpumpingirrigationsystem basedon
                                      waterfootprintandwater - energy - grainnexus

                                                                                       1,3
                                          1
                                                                         2
                                                         1
                                CUISimeng,WUMengyang,WANGXiaojun,CAOXinchun
                             (1.CollegeofAgriculturalScienceandEngineering,HohaiUniversity,Nanjing 210098,China;
                                  2.StateKeyLaboratoryofHydrology - WaterResourcesandHydraulicEngineering,
                                        NanjingHydraulicResearchInstitute,Nanjing 210029,China;
                              3.JiangsuProvinceEngineeringResearchCenterforAgriculturalSoil - WaterEfficientUtilization,
                                     CarbonSequestrationandEmissionReduction,Nanjing 210098,China)

                  Abstract:Irrigationsystemisthekeycarrierofagriculturalproductionandwateruse,andthecoordinationofwa
                  ter - energy - grainnexushasanimportantimpactonregionalsustainabledevelopment.Comparedwithtraditional
                  studiesonefficientallocationofirrigationwater,waterfootprinttheoryclarifiesthetotalwaterconsumptionanduti
                  lizationtypesofagriculturalproductionwaterresources.Inresponsetotheproblemofwater - energyresourcessup
                  plyanddemandincompatibleallocationandtheecologicalimpactincomprehensiveconsiderationinpumpingirriga
                  tionsystem,amulti - objectiveoptimizationevaluationmodelofplantingstructureinpumpingirrigationdistrictwas
                  constructedbycombiningthewaterfootprinttheoryandwater - energy - grainnexuswithintegratingthemulti - dimen
                  sionalsystemsofsocial ,resources,ecology,andeconomy,takingintoaccountthefullphasesofwaterresource
                  allocation,agriculturalproductionwaterandgrainproductiontransfer.ThemodelwasappliedtoLianshuiIrrigation
                  Districttoadjusttheplantingstructureofgraincrops(rice,wheat,maize,andsoybeans),andthentheTopsis
                  methodwasadoptedtocompareandevaluatetherelativeclosenessbetweenthestatusquoandoptimalconfigura
                  tions.Theoptimizationresultsshowthatunderthebasicpremiseofensuringfoodsecurity,thesowingareaof
                  maizeshouldbeincreased ,andthatofsoybeansshouldbereduced.Comparedwiththestatusquo,theannualu
                  nilateralwatereconomicnetbenefitofgrainincreasedby4.0% aftertheoptimization ,andcropcarbonfootprint
                  showedadownwardtrendwhencropplantingbaselinewaschangedwithdecreasingby79.5kgin2018aftertheopti
                  mization.Therelativeclosenessoftheoptimizationschemewasgreaterthanthestatusquo,whichplaysareliable
                  supportingroleinpromotingefficientresourcesutilizationandagriculturalsustainabilityinpumpingirrigationsystem.
                  Keywords:water - energy - grainnexus;cropwaterfootprint;multi - objectiveoptimization;pumpingirrigation
                  system ;Topsisevaluationmethod


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