21353.古爾班通古特沙漠西部梭梭退化原因探究_第1頁
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1、石河子大學(xué)碩士學(xué)位論文古爾班通古特沙漠西部梭梭退化原因探究姓名:司朗明申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):植物學(xué)指導(dǎo)教師:劉彤201106IIAbstractHaloxylonammodendronisconstructivespeciesofGurbantonggutDesertthesecondlargestdesertofChinaInthesfixingsoilmaintenanceoftheoasisdesertecologicalbal

2、ancehasanirreplaceablerole.Butthesurveyfoundithasdegeneratedinlargeareasofplainssmalldunes(height10m)nearbytheplantsgrownmally.Thereisalargenumberofdeadplantslimitingtherenewalofthesepopulationsthedegeneratedareaofabout4

3、0millionhm2.Thereasonofdegradationurgentlyrequiresanalysis.InthispaperH.ammodendronfestofaseriousdegradationintheplainssmallduneshabitatsfthestudythegrowwellinthebigsdunehabitatfthecomparison.FromtheacteristicsofH.ammode

4、ndronpopulationclimaticfactsthedepthofgroundwaterwaterqualityclimaticfactsgroundwaterlevelwaterqualitycontrastseedgerminationseedlingsurvivalofH.ammodendronthepH值ysicalchemicalsoilpropertiesin3habitatsoftheplainsmalllarg

5、esduneotheraspectsofcomprehensiveanalysisthecausesofH.ammodendrondegradationofGurbantunggutDesert.Theresultsshowedthat:1)ThedeadplantsofH.ammodendronshowedverysignificantlyclusterdistributionin15plotsamongallobservation1

6、9plotswhichindicatedthatitwasnotselfthinninginnerspecies.ThereweredeadplantsinallagesofH.ammodendronpopulationwhichindicatedthattherewerenorelationshipbetweenplantsagedegeneration.2)Annualprecipitationinthestudyareadidno

7、tchangesignificantlythepast20whiletheaverageannualpotentialevapotranspirationmoderateincreasingtrendindicatesthatprecipitationisnotamajfactinH.ammodendrondegradation.3)TherelationshipbetweensurvivalindexofH.ammodendronpo

8、pulationgroundwaterlevelweresignificantlynegative(R2=0.364P0.01)groundwaterdepthgroundwaterhighconcentrationsofsaltcombinedeffectgroundwateruseofH.ammodendron.4)The100seedweightwithwingedperianthwingedperianthdiameter100

9、seedweightwithwingedperiantharesignificantdifferenceinthreehabitats.H.ammodendronseedgerminationratewasnotsignificantatthenonsaltthreatenconditionevenalldecreaseswiththesaltconcentrationincreasingbutthedecreaseofseedgerm

10、inationrateismesignificantinnmalareaindicatingthatacteristicsofH.ammodendronseedisnotthemainfactaffectingregenerationabilityofH.ammodendronpopulation.Therelationissignificantlynegative(R2=0.374P0.01)betweenelectricalcond

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