CO2濃度倍增對栽植不同種植物土壤主要養(yǎng)分利用的影響.pdf_第1頁
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1、UniversityCode：10225RegisterCode：S16691DissertationfortheDegreeofMasterEffectsofDoubledC02ConcentrationonUtilizationofMainNutrientsinSoilPlantedwithDifferentSpeciesCandidate：Supervisor：AssociateSupervisor：AcademicDegreeA

2、ppliedfor：Speciality：Dateof0ralExamination：University：QianWenliProfWangZhengquanAssociateProfGUJiacunMasterSilvicultureJune2016NortheastForestryUniversityAbstractAbstractSoilnutrientsisthematerialbasisforplantgrowthandde

3、velopment，andplayanimportantroleinnutrientcyclesandenergyflowinterrestrialecosystemGlobalclimatechangecausedbyelevatedatmosphericC02concentration([C02】)willaffectplantnutrientuptakeandsoilnutrientconcentrationssuppliedto

4、theplantHowever，soilnutrientresponsestoelevated[C02]indifferentspeciesplantedinforestlandisstillpoorlyunderstoodThisstudyusefiveeconomicandecologicalwoodyspecies(Betulaplatyphylla，Acermono，Larixgmelinii，Phellodendronamur

5、ense，F(xiàn)raxinusmandschurica)andsixcommonherbaceousplants(Perillafrutescens，elymusdahuricus，Amaranthustricolor，Onobrychisviciaefolia，Aquilegiaviridiflora，Chenopodiumalbum)toexaminethechangesofplantbiomass，soilnutrientsandmi

6、crobesundertheconditionsofdoubled[C02】(350to700gmolmol。1)仃eatmentsOurresultsshowthat：(1)Doubled[C02]inthisexperimentsincreasedinplantbiomassgrowth，butthebiomassgrowthWassignificantdifferenceswithplantlifeformForherbaceou

7、splants，doubled[C02]promotedrootbiomassgrowthgreaterthanaboveground(2)Totalsoilnutrients，suchastotalC，totalN，totalPandtotalK，inpotsofwoodyseedlingplantedwerenotaffectedbydoubled[C02]treatmentscomparedwiththepotsofnonseed

8、lingplantedInpotsofherbseedlingsplanted，exceptingtotalPwhichsignificantdecrease，allothertotalnutrientsalsonotchangedInaddition，theconcentrationsoftotalnutrientsinpotsoilwerechangedamongthewoodyspeciesandherbaceousplantsi

9、nthisexperiments(3)Doubled[C02】significantlyreducedsoilnitrateNconcentration，butthemagnitudeofreductionsdifferedamongspecieswiththereductionrangesfrom17％(Perillafrutescens)to57％(Elymusdahuricus)inthisexperimentsThereason

10、smaybethespecieswithfastergrowthhaveagreaterdemandforsoilnitratenitrogen，andincreasetheutilizationefficiencyofsoilnitrateNunderdoubled[C02]treatmentBycontrast，soilammoniumNinpotswithwoodyandherbaceousseedlingplantedweren

11、otaffectedbydoubled[C02]，buttheconcentrationsofwhichhavegreaterdifferencesamongthespeciesTheconcentrationsofsoilavailablePandKinpotswerenotchangedforwoodyspeciesunderdoubled[C02]treatments，butsignificantreductiononlyoccu

12、rredinsomeherbaceousplants(4)SoilmicrobialbiomassCinpotsoilofwoodyspeciesandherbaceousplantsspeciesdifferedsignificantlyunderdoubled[C02】treatmentsDoubled[C02】treatmentsincreasessoilmicrobialbiomassN，butthedegreeofrespon

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