云南撫仙湖流域營養(yǎng)鹽在土壤中遷移轉(zhuǎn)化模擬.pdf

1、東南大學碩士學位論文云南撫仙湖流域營養(yǎng)鹽在土壤中遷移轉(zhuǎn)化模擬姓名：黃麗江申請學位級別：碩士專業(yè)：環(huán)境工程指導教師：高海鷹20080101STUDYoNTHESIMUIATIoNoFNUTIUENTSMIGRATEANDTRANSFOlU訌INYUNNANFUX圳HUI。AKECATCHMENTGraduateStudentHUANGLijiangSupervisorAssociateProfGaoHaiyingDepartmentofM

2、unicipalEngineeringSchoolofCivilEngineering，SoutheastUniversityABSTRACTChoosenthenorthbankofFuxianhuLakehighlyrepresentativetypicalvegetablericoplantingfarmlandastheobjectofstudyusingthesoilcolumnexperimentssimulationasb

3、asictoallalyzcthenutrienIsleachingprocessunderthedifferentrainfallintensityandusingsoilcolumnexperimentsdatatocalibrateLEACHMmodeltoobtionthemodelparametersthatagreeabktothestudyareaAtthesametimecombinedwiththeirrigation

4、fcrtilizationfieldsurveysdataandthelevelofgroundwaterandthenntrientaconcentrationobservationdata勰well豁usingU認CHMmodeIsimulationFuxianhuLaketypicalfarmlandnutrientsleachingsitnlationtodiscusstheinfluenceofnutrientsleachin

5、gunderdifierentirrigationfcrtilizersituationItusethecalibatedmodeltoanalyzethesoilnutrientsleachinginthestudyfarm／andunderthedifferentofifrigationquantitiesfertilizationquantitiesandthetypesoffertilizerandnlakeoutnutrien

6、tsconcentrationchangeprocessandreasonsThreesetsofsoilcolumnexperimentunderthecircumstancesof075O85121mm／minrainfallintensitieswasdiseussedwiththeincreasingrainfallintensitythewaterinfiltrationlcachingvelocityincreasingAn

7、dnitrogenleachingshowthesamelawTheinfluenceofphosphousleachingundertherainfallintensitiesisverysmallifitdocsn’t[HrndncosurfacerunofftheleachingofphosphomsshowedrainfalllinearrelationshipwithrainfallquantityIntheexperimen

8、tsthecorrelationtoefficientofR‘is0982LEACHMmodelwasvalidatedbysoilcolumnexperimentsanditobtainsthesomeeffectsThenorthhankofFuxianhuLakehighlyrepresentativetypicalvegetablericoplantingfarmlandastheobjectofstudywaschoosent

9、odisscuss山enutrientschangelawinthedifferentplantingperiodofthesamefarmlandBasicontheobservationdatathemajornutrientsleachingisnitrate—NinvegetableplantingperiodandtheammoniumNandtotal—Pleachingareverysmall；thenitrateNlea

10、chinginfloodedfarmlandissmallerthanvegetableplantingfarmlandandtheammoniumNandtotalPleachingquantitiesarebiggerthallfloodedfafinlandUsingU!ACHMmodelcalculatethenutrientsleachingtherespectivelyofnitrateN，ammoniumN。total—P

11、leachingquantitiesinvegetableplantingperiodis467，01，01kg／haTherespectivelyofnitrateN。ammonium—N，total—Pleachingquantitiesinricoplantingperiodis95，4623kg／haTothesanleoffarmlandanddifferenttypesofplantingthesoilconductivit

12、iesisdifferentInthevegetableplantingperiodthesoilislooseandexistbigholes，sothemoistureleachingvelocityisgreatButinthericeplantingperiod，thesoilislongtermimmersioninthewaterandthesoilbiggap(channels)easilyplugthemudsowate

13、rconductivityrelativelysmallThereforeinusingtheLEACHMmodelitisneedtoadoptdifferentmodelparameterstosimulatedifferentplantingperiodinordertoachievethebestsimulationresultsItusethecalibatedmodeltoanalyzethesoilnutrientslea

14、chinginthestudyfarmlandunderthedifferentofirrigationquantities，fertilizationquantitiesandthetypesoffertilizerandmakeoutnutrientscA)neontrationchangeprocessandreasonsWiththeincreasingrainfallquantity，nitrigonandphosphorus

15、areincreasingInthesitulationofexistingirrigationquantities，increasingtheirrigationquantitiesinthevegetibleplantingfarmlandcanreducethenitrateNconcontratinn：Increasingtheirrigationquantifiesinthevegetibleplantingfarmlandc

16、anincreasethenitrigon，phosphomsconcentrationWiththeincreasingimposedfertilizerquantities，theimposednitrogenleachingquantitiesisincreasingTheimposedfertilizerquantityshowremarkablelinearrelationshipwithnitrateNlcachingqua

17、ntitiesandnitrateNconcentrationrainfallquantitybutthefertilizerquantitiesdon’tshowlinearrelationshipwithammonia—NTheimposedfertilizel“quantitiesdon’teffectphosphorusleachingImposedtheammonianitratecanleadtoagreatdealofni