污水灌溉與施肥條件下氮素在土壤中遷移轉(zhuǎn)化動(dòng)態(tài)的初步研究.pdf

1、中國(guó)農(nóng)業(yè)大學(xué)碩士學(xué)位論文污水灌溉與施肥條件下氮素在土壤中遷移轉(zhuǎn)化動(dòng)態(tài)的初步研究姓名：甘露申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：農(nóng)業(yè)水土工程指導(dǎo)教師：黃冠華2002.6.1APreliminaryStudyontheDynamicsofNitrogenTransportandTransformationinSoilsUndertheConditionsofIrrigationwithSewageEffluentandFertilizationAbstr

2、actStudyingonthemechanismofni口ogentransportandtransformationundertheconditionsoffertilizationandirrigationwithsewageeffluentisveryimportantforutilizationofsewageeffluentandfertilizerandpollutioncontr01Basedonlaboratoryan

3、dfieldexperimentandnumericalsimulation，nitrogentransportandtransformationhasbeeninvestigatedinthisdissertationInlaboratorystudy，theexperimentsofNH4“一Ntransportandtransformationhasbeenconductedwithcolumnspackedwithhomogen

4、eoussandyloamyundersaturatedandunsaturatedconditionsMeanwhiletheadsorptionpattemofNH一hasbeenstudiedwithbatchequilibriummethodResultsindicatethatthetransportof＼H4一Ninsoilsshowssigmficantretardation，andtheadsorptionpaaemof

5、NH4callbedescribednithlinearmodelItisalsoshownthat“NrH4一Nexistsslightandmuchmorenitrificationphenomenoninsaturatedsoilsandunsaturatedsoilsrespectivel3_AndN03一一NCallbeleachedtosoillayerbelowthewettingdepthThecon、’ectiondi

6、spersionequationu‘iththeretardationcoefficientyieldbymethodhasbeenadoptedtomodelNH4一NtransportinsaturatedsoilsimulationresultsarecomparedwellwithexperimentalresultsInfieldstudy，theexperimentonmtrogentransportandtransform

7、ationinsoilsw：tthdifferent：rogationiulthboth_around、、aterandseⅥageeffluent)andfertilizationlexeIshasbeenconducted；lithconsideringtheNuptakenitrificationanddenitriffcationprocessesjamodelfordescribingN0=一一Ntransportandtrm

8、astbrmationinunsaturatedsoilhasbeenappliedResultsshowthattheN03一Naccumulatinginsoiliscontributedmoreb3’fertilizationbutleesbyirrigationwithsewageeffluent，andthemodelcarlbeusedtosimulateNOj一一、transport血soilsKeywords：Ni口og