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1、西北農(nóng)林科技大學(xué)碩士學(xué)位論文外源性C、N干擾對(duì)人工林生態(tài)系統(tǒng)的影響姓名：高祥斌申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：生態(tài)學(xué)指導(dǎo)教師：劉增文20050601EFFECTSOFEXTERNALSOURCESC、NDISTURBANCESONARTIFIClALFORESTECOSYSTEMABSTRACTThedeclinationoflandfertilitywhichisthemainreasonthatcausestheslowingdownoff

2、orestgrowthisbecomingoneofthefocusesofcurrentecologicalresearchofforestThetraditionalresearchwhichregardingphysicalandchemicalcharacteristicsastheforestsoilqualityindexhasalreadymadeagreatachievements，butresearchonthebio

3、logicalcharacteristicofsoilisveryfewInthispaperfourkindsofartificialforest(Cjaponicum，Pmassoniana，ButilisandPasperata)intheupperreachofMingjiangRiverinSichuanwerestudiedThroughfieldplotsexperimentsofexternalsourcesC(cail

4、esugar)andN(NH4N03)disturbanteswithdifferentintensitiestoforestthedynamiccharacteristicsofsoilmicroorganisms，thedecompositionofwitheredleavesandforestgrowthwerestudied，therelationshipbetweenthesoilmicroorganisms’activity

5、andmainchemicalpropertytherelationshipbetweensoilcharacteristicsandtreegrowthwereanalyzedandthesoilqualitywascomprehensivelyappraisedThemainconclusionsareasfollows：(1)C、NdisturbancemadethecontentofmicroorganismbiomassC(M

6、B—C)inlowersoillayer(20—40cm)ofPmassonianaButilisandPasperatasoilincrease，butthecontentofMB—CinCjaponicumsoilmaintainnearlythesamecompared、^，imthecontr01C、NdisturbancesmadethecontentofMB—CinButilisandPmassonianasoilincre

7、asebutmadeitdecreaseinCjaponicumsoilLowNdisturbancemadethecontentofMBCinPasperatasoilincrease，butitisnotsignificanttoPmassonianaButilisandCjaponicumC、Ndisturbancesreducedtheupperlayer(020cm)contentofmicroorganismbiomassN

8、(MBN)inPmassonianaButilis，PasperatasoilsignificantlybutthecontentofMB—NinCjaponicumsoilmaintainnearlythesamecomparedwiththecontrol，howeverthetotalcontentofMBNshowedfldecreasedtendencyNdisturbancecartincreasethemicroorgan

9、ismbiomassC／N(MB—C／N)rateinButilL，es，PmassonianaandPa5peratnsoil，CdisturbancecouldincreasetherateofMB—C／NinCjaponicumsoil，butNdisturbancedecreasedit(2)C、Ndisturbancereducedureaenzymeactivityinuppersoillayerbutincreasedin

10、thelowersoillayersignificantlyandthetotalactivityofureaenzymeislowerthanthecontrolfexcept丑utilis)，C、Ndisturbancedidn’tinfluencetheproteaseactivityoftheRmassonianasoilobviouslyLowNcanincreaseproteaseactivityofCjaponicumBu

11、tilisandPasperatasoilC、Ndisturbancehadgreatinfluenceonthecatalaseenzymeactivityin尸massonianasoilhighNandlowChadgreatereffectonit，itisnotsignificanttotheotherthreeforesttypeLowNandhighCdisturbancesincreasedtheinvertaseenz

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