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1、UniversityCode：10225RegisterCode：S16717DissertationfortheDegreeofMasterTheinfluenceofheavyfiredisturbanceonthesoilnutrientchangesintheLarixgmeliniiforestCandidate：Supervisor：AssociateSupervisor：AcademicDegreeAppliedfor：S

2、peciality：DateofOralExamination：University：XingYueProfHuHaiqingProfSunLongMasterForestFirePreventionJune2016NortheastForestryUniversityAbstractForestecologicalsystemofsoilnitrogenmineralizationisoneofthemostimportanttunc

3、tionofecosystemNitrogenmineralizationratedeterminestheavailabilj夠ofnitrogen(wnlchwasusedforplantgrowth)inthesoilResearchontheeffectofsoilmoisture，physicalandchemlcalproperties，soilmicroorganisms，andothernaturalormanmadei

4、nterferenceandmanyotherfactorslSanimportantapproachtevealtheregulationmechaniSmofnitrogenmineralizationFireisallimportantnaturalinterferencefactorsfortheforestecosvstemsinnorthChina，andthemechanismofsoilnitrogenmineraliz

5、ationinresponsetofiredisturbance1SpoorlyunderstoodThroughfieldsamplingandlabanalysis，westudiedthedvnarnicVariationsandcorrelationsbetweentheeffectfactorofnitrogenmineralizationrateinthesoilintheDaxinganlingMountainofChin

6、aThemainresultsaresummarizedasf01lows：1Theeffectofsoilnitrogenmineralizationinresponsetofiredisturbance：rnleaHullonlurnnitrogencontent，theNanwengheandTahesoilshowthesamechangetrenda&rflredlsturbance，itoverallshowedasigni

7、ficantincreaseofammoniumnitrogencontent1ncreaSedabout4mg／kgAndthecontentofammoniumnitrogenatofMohehadnoobviousc上langeForthechangeofthecontentofsoileffectivephosphorusandavailablepotassiurnshowedobviousregionaldifferences

8、thisexperimentfoundthatthesoilmoistu工econtentandsoilPHvaluewerenotthesameinresponsetOfiredisturbanceinthedi疏rentDartofDaxinganlingMountainofChinaThesoilmoisturecontentandsoilPHvalueofNanwengheandlanewerenotobviouschanged

9、afterfiredisturbance，whichshownnosignificantdifference(P005)，whilethesoilmoisturecontentandsoilPHvalueofMoheshowedsignificantdifferencesAfterfiredisturbance，thesoilmoisturecontentofMohewereshownobviousincreasetrend，while

10、thesoilPHvaluechangefellsignificantlyinMoheTheeffectivephosphoruscontentinNanwengheshowedasignificantlydecreasedafterfiredistIlrbancewhileinTahetheeffectivephosphoruscontentshowedanoppositetrendTheeffectivephosphoruscont

11、entinTahedidnotchangedsignificantlyTherapidlyavailableKcontentin—anwengheshownthattherewasnosignificantdifferenceafterfiredisturbance。butthempidlyavailableKcontentinTaMhadincreasedsignificantlyWhileinMohethecontenthaddec

12、linedThisexperimentalsofoundtotalorganiccarbon(TOC)showedsignificantdifferencesbetweentopsoilandsubsoilInthetopsoil，thetotalorganicca柏onfTOC)contentofNanwengheandTahewasincreased，andtheTOCcontentinMoheⅥ，erereducedIncontr

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