施肥與刈割對(duì)亞高山草甸常見禾草及群落生產(chǎn)力的影響—植物個(gè)體、種群與群落對(duì)刈割的補(bǔ)償反應(yīng).pdf

1、西南農(nóng)業(yè)大學(xué)(重慶)博士后士學(xué)位論文施肥與刈割對(duì)亞高山草甸常見禾草及群落生產(chǎn)力的影響—植物個(gè)體、種群與群落對(duì)刈割的補(bǔ)償反應(yīng)姓名：王海洋申請(qǐng)學(xué)位級(jí)別：博士后士專業(yè)：園藝學(xué)指導(dǎo)教師：王曉佳2001.12.1AbstractBasedontheanalysisoftheimpactsoffertilizationandclippingonindividualsgrowthandreproductionofthreecommongraminac

2、eousgrassesthoseareAvenasativa，F(xiàn)estucasinellsisandElymusllutallS，andontheabovegroundproductionsofdifierentpopulationsofElymusnutans，andontheabovegroundproductionsofsubalpinemeadowcommunitiesinMaqu，GansuProvince，compensat

3、oryplantresponsestosimulatedgrazingwerecomparedThesestudiescouldprovidescientificbasistomanagegrassland，restoredegradedgrasslandsandimprovequalityofgrasslandsThemainconclusionsareasfollows：1Clippingintensityclippingtimea

4、ndfertilizationlevels，influencedcompensatoryplantresponsestosimulatedgrazing2Compensatoryabilitycouldbeincreasedwhenfertilizing3OvercomensationwerenotfoundforAvenasativa，butexactcompensatoryresponseswerefoundforthreespec

5、ieswhenclippingintensityislightandplantswerefertilizedAsforregrowthabilityElymusnutansisnotmorethanFestucasinellsis4Thefertilizationtomeadowcommunitieslcadstoincreaseinplantabovegroundproductionanddeclinesinplantspeciesd

6、iversity5Plantspeciesdiversityincreaseswithhi【ghclippingunderlowlevelfertilization；Whiledeclineswithhighclippingunderhighlevelfertilization6Fertilizationandclippingtreatmentssignificantlyinfluencecommunitycompositiongrou