22397.古爾班通古特沙漠種子秋萌特征及萌發(fā)趨勢的研究

1、石河子大學碩士學位論文古爾班通古特沙漠種子秋萌特征及萌發(fā)趨勢的研究姓名：曾曉玲申請學位級別：碩士專業(yè)：植物學指導教師：劉彤201106IIAbstractThegerminationtimeofseedsscattersindifferentseasonswhichcontributestotheutilizationofresourcesaswellasthecontinuationgrowthoftheirpopulation.Th

2、ecommonacteristicsofautumngerminatedseedstheirenvironmentaldependenceofgerminationwerestudiedviatheinvestigationofthespeciesoftheautumngerminatedplantstheirdistributionacteristicsinGrurbantonggutdesertthebiologicalacteri

3、sticsoftheseedstheirgerminationresponsetotemperaturemoisture.wegetconclusions：(1)Autumngerminatedspeciesdistributein33sitesamong67sitesmostspeciesisephemeralplantsaccounting25speciesf50%meofthetotalnumberofephemeralplant

4、s.AutumngerminationiswidespreadinGrurbantonggutDesert.(2)Seedgerminatesindifferenttimecanavoidpossiblerisks.Seedlingstagerootsbiomassofautumngerminatedaresignificantlygreaterthanthatofspringgerminated.Withlimitedresource

5、sautumngerminatedseedlingstakeacompetitiveadvantageReproductivestagealargenumberofseedyieldofautumngerminatedcontributetopopulationcontinuityexpansion.(3)Thehightemperaturerangeofseedsgerminationisbroadthegerminationtype

6、isnotalowtemperaturetypeofearlyspringthisisincrespondencetothetemperatureinthenaturalenvironmentfromSeptembertoNovember.GerminationissensitivetosoilmoisturetheRDAfurtherrevealsthatmoistureisarestrictedfacttothegerminatio

7、ntimeofseeds.(4)Thefruitsofautumngerminatedplantsareeasytodehiscencetheirseedshaveashtlifespantheydonothavedmancy.(5)Withtemperatureincreasinginwinterfreezetimebeingshtenitinfersthatclimatechangeinautumnprovidesfavableco

8、nditionsfseedgermination.theproptionofseedgerminationpronestodecreasewhenautumngerminationgetsmeadvantagebymodelsimulating.inanotherwdautumngerminationwillsustainastabledegreeunderclimatechangeifit’sadvantageispresented.

9、ConsequentlyseedgerminationinGrurbantonggutDesertisdeterminedbothbyseeditselfenvironment.Inearlytimepropaguleexistsinsoilasthefmofseedswithouttheprotectionofparentplant.Thosepropagulemustgrowinaproperperiodduringtheirlim