Page 78 - 《水资源与水工程学报》2023年第3期
P. 78

!34 " ! 3 #                       & ' ( ) & * + , -                               Vol.34No.3
               2023 $ 6 %               JournalofWaterResources&WaterEngineering                 Jun.,2023

            DOI:10.11705/j.issn.1672-643X.2023.03.09


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               ABCDE:X524   FGHIJ:A    FKLE:1672643X(2023)03007409

                       Characteristicsanalysisandretentioneffectofphosphorusand
                                         nitrogenfluxesinDongtingLake

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                        ZHAOZihao ,YUANJing,TIANZebin,CHUZhaosheng ,WANGXing                    1
                (1.NationalEngineeringLaboratoryforLakePollutionControlandEcologicalRestoration,StateEnvironmentProtectionKey
                  LaboratoryforLakePollutionControl ,ChineseResearchAcademyofEnvironmentalSciences,Beijing100012,China;
                      2.KeyLaboratoryofPoyangLakeEnvironmentandResourcesUtilization,MinistryofEducation,Schoolof
                                 Resources&Environment ,NanchangUniversity,Nanchang330031,China)
               Abstract:BasedonthehydrologicalandwaterqualitydatainthemainmonitoringsectionsofDongting
               Lakefrom2013to2017,influxesofTNandTPfromthefourupstreambranches(XiangRiver,ZiRiver,
               YuanRiverandLiRiver)andthreewaterinlets(Songzi,TaipingandOuchi)ofDongtingLake,aswellas
               theoutfluxofChenglingjioutletwereestimatedtoanalyzethespatiotemporalcharacteristicsandretention
               effectofthetwopollutants.TheresultsshowthattheannualnitrogenandphosphorusfluxesintoDongting
               Lakeshowedanoverallincreasingtrendduring2013-2016 ;butin2017,influencedbythesynchronous
               changeofwaterqualityandwaterquantity,thenitrogenandphosphorusinfluxesdecreasedby19.93% and
               23.14%,respectively,comparedwith2016.Controlledbyseasonalvariationofwaterquantity,thenitro
               genandphosphorusinfluxesdistributedunevenlyintheyear ,withmorethan70% fromApriltoSeptem
               ber.Intermsofspatialdistribution ,thenitrogenandphosphorusinfluxesmainlycamefrom thefourup
               streambranches ,accountingfor78.48% and71.77%,withthegreatestcontributionfromtheXiangand
               YuanRivers.Thefourupstreambrancheswereaffectedbythecomprehensiveeffectofpointandnonpoint
               sourcepollutionwhereasthethreewaterinletsweremainlyinfluencedbynonpointsourcepollution.Apart

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