Integration-of-water-quantity-and-quality-in

ProcediaEnvironmentalSciences13(2012)1535–15521878-0296©2011PublishedbyElsevierB.V.Selectionand/orpeer-reviewunderresponsibilityofSchoolofEnvironment,BeijingNormalUniversity.doi:10.1016/j.proenv.2012.01.146Availableonlineatwww.sciencedirect.comProcediaEnvironmentalSciencesProcediaEnvironmentalSciences8(2011)1562–1579www.elsevier.com/locate/procediaThe18thBiennialConferenceofInternationalSocietyforEcologicalModellingIntegrationofwaterquantityandqualityinenvironmentalflowassessmentinwetlandsY.Yang,H.Chen,Z.F.YangSchoolofEnvironment,BeijingNormalUniversity,Beijing100875,ChinaStateKeyLaboratoryofWaterEnvironmentSimulation,Beijing100875,ChinaAbstractHydrologicalregimeisadrivingfactorinwetlandecosystems.Itsexcessivealterationwillleadtoseveredegradationofwetlands.Assessmentofenvironmentalflowsisessentialforwetlandprotection,recovery,andrestoration.Inordertosolvetheexistingproblemsoftraditionalmethods,suchasrarelyconsideringwaterqualityandecosystemstatus,anewmethodwasdevelopedtoassesstheenvironmentalflowsofwetlandthatwillreflectthesynergisticeffectofwaterqualityandquantityonecosystems.TheproposedmethodwasappliedtotheBaiyangdianwetland,thelargestshallowlakeandwetlandcomplexintheNorthChinaPlain.Themainstepsareasfollows:1)Basedonthemaximumdistanceclusterresultsofwaterqualitydataandorganismdata,theBaiyangdianwetlandwasdividedintofiveregions.ThekeyspeciesweredistinguishedbyaseriesofsimulatedremovalexperimentsusingtheEcosimmodel.2)IntegratingthetypicalmonthlyaveragewaterlevelandthesurfacewaterqualitystandardsofClassesⅢ,Ⅳ,andⅤ,21integratedscenariosweredesigned.Aquatoxmodelwasappliedtoanalyzetheresponseofphytoplankton,zooplankton,zoobenthosunderdifferentcircumstancesofwaterlevels,NH3,NO3-,PO43-,BOD5andotherenvironmentalfactors,illustratingthetemporalandspacialdistributionofbiomass,thestatusofstructureandfunctionsofecosystemunderthesynergisticeffectofwaterqualityandquantityscenarios.3)Basedonthevariationtrendofassessmentindicatorssuchastotalprimaryproduction/totalrespiration,totalb