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湖泊底泥氮释放规律模拟研究(英文).docx

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湖泊底泥氮释放规律模拟研究(英文) SimulationStudyonNitrogenReleasefromLakeSediments Introduction Lakesedimentsareimportantreservoirsofnutrientsinaquaticecosystems.Amongthem,nitrogen(N)isacriticalelementaffectingthewaterqualityandecologicalhealthoflakes.ThereleaseofNfromsedimentstotheoverlyingwatercanstimulatealgalgrowth,degradewaterclarity,andconsumedissolvedoxygen,leadingtoeutrophicationandhypoxia.Therefore,understandingtheNreleasedynamicsfromlakesedimentsisessentialtomanageandrestoredegradedlakes.Inthisstudy,wesimulatedtheNreleaseprocessfromlakesedimentsandinvestigatedthefactorsaffectingit. Methods Wecollectedsedimentcoresfromashalloweutrophiclakeandmeasuredtheirphysicalandchemicalproperties,includingdepth,bulkdensity,totalorganiccarbon(TOC),totalnitrogen(TN),andammonium(NH4+-N)andnitrate(NO3--N)concentrations.WeusedadiffusionmodeltosimulatetheNreleaseprocessfromsediments.ThemodelassumesthatNdiffusionoccursbetweensedimentparticlesandwaterasdrivenbyconcentrationgradients,andNfluxesareinfluencedbysedimentproperties,watertemperature,andnutrientavailability.Wecalibratedthemodelusingfielddataandransimulationsunderdifferentscenarios. Results ThesedimentcoresfromtheshalloweutrophiclakecontainedrelativelyhighlevelsofTOC(rangingfrom14.1to34.8g/kg)andTN(rangingfrom0.9to2.8g/kg).TheNH4+-NandNO3--Nconcentrationsintheporewatersvariedwithdepthandsedimentproperties,withthehighestvaluesfoundinthesurfacesediments.TheNreleasefromthesedimentsfollowedanon-linearpattern,withaninitialrapidreleasefollowedbyaslowerreleasephase.ThesimulationresultsshowedthattemperaturehadasignificanteffectonNrelease,withhighertemperaturespromotingfasterNfluxes.ThesedimentpropertiesandnutrientavailabilityinfluencedthemagnitudeandrateofNrelease,withhigherTOCandNH4+-NconcentrationsleadingtohigherNfluxes.ThemodelalsopredictedthattheNreleasewouldcontinueforalongtime,withmorethan80%oftheinitialNstoredinthesedimentsbeingreleasedwithin10-20years. DiscussionandConclusion ThesimulationstudyprovidedinsightsintotheNreleasedynamicsfr