Page 27 - 2024年第55卷第5期
P. 27

High - resolutionmodelingofurbanwaterandcarbonfluxesin
                                          themainurbanareaofBeijing ,China

                                                                          1
                                                          2
                                                                                          1
                                          1,2
                              1
                                                                                                       1
                  SHAOWeiwei,SHAORui ,NIGuangheng,WANGYicheng,YANGZhiyong,LIUJiahong
                            (1.StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,ChinaInstituteof
                                      WaterResourcesandHydropowerResearch,Beijing 100038,China;
                                      2.StateKeyLaboratoryofHydroscienceandEngineering,Departmentof
                                     HydraulicEngineering ,TsinghuaUniversity,Beijing 100084,China)
                  Abstract:Urbanizationaltershydrologicalandecologicalprocesses,suchasregionalwater - heatbalance,byaf
                  fectingsurfaceevapotranspiration (ET)processes,whichinturnchangesthestructureandfunctionofterrestriale
                  cosystems.Toscientificallyassesstheurbanwater - carbonprocess ,thisstudyestimatedthemonthlyvegetationin
                  dexat10m × 10mspatialresolutioninthemainurbanareaofBeijingfrom2016to2021basedonthevegetationin
                  formationfromSentinel - 2data ,andfurthercombinedwiththePT - JPLimmodel,theInVEST(IntegratedValua
                  tionofEcosystemServicesandTradeoffs),andtheanalyticalWUE(WaterUseEfficiency)modeltosimulatethe
                  monthly ET,ETpartitioning(transpirationE t ,soilevaporationE b ,interceptionevaporationE i ,andimpervious
                  surfaceevaporationE u ),grossprimaryproductivity(GPP),carbonstorage,andecosystemWUEforthemainur
                  banareaofBeijingataspatialresolutionof10m × 10m.Largervaluesofvegetationindexwereconcentratedinthe
                  westernmountainousareas,andtheparkareasofBeijingalsopresentedlargerNDVI(NormalizedDiffernceVegeta
                  tionIndex )withamaximumvalueof0.65.TheannualmeanETinthemainurbanareaofBeijingis497mm,with
                  thehighestETinthewesternmountainousarea,exceeding1000mm.ETincreaseswiththeincreaseofLAI(Leaf
                  AreaIndex )andEVI(EnhancedVegetationIndex).IncreasesinNDVI,LAI,andEVIwereobservedatarateof
                               2
                                   - 2
                  0.0048,0.016m ·m ,and0.0047peryear,respectively,from 2016to2021.TheregionalaverageE t was
                  141.51mm ,E i was50.77mm,andE b was272mm.E u wasdistributedonlyonimpervioussurfacesofbuilding
                  sites ,andE u ?ETonimpervioussurfaceswas18.2%.Theareaswithhighercarbonstorageweremainlydistributed
                  inthewesternmountains ,whichhadrelativelyhighelevation,highvegetationcover,andhighvaluesoftotalcar
                                             2
                                                                                          - 2
                                                                                               - 1
                  bonstoragedensityexceeding5t?hm .ThemeanvalueofGPPinthestudyareawas2.7g·m ·d ,andthe
                                             - 1
                  annualmeanWUEwas0.63g·mm .TherewasasignificantnegativecorrelationbetweenWUEandE t ?ET(R =
                  - 0.44 ,p<0.001),andWUEtendedtoincreasesignificantlywithincreasingGPP.Therefinedurbanwaterand
                  carbonsimulationcanprovideatheoreticalbasisfortheconstructionandevaluationofspongecities,andthesimu
                  lationofurbanwaterandcarbonfluxesisofgreatsignificancefortheachievementofthecarbonpeakingandcarbon
                  neutralitygoals.
                  Keywords:urbanization;ecosystems;evapotranspiration;Beijing;wateruseefficiency


                                                                                    (责任编辑:耿庆斋)




























                                                                                                —  5 2 7 —
   22   23   24   25   26   27   28   29   30   31   32