三江源区高寒草甸43种植物繁殖体质量和形状的比较3

©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.()JournalofNorthwestA&FUniversity(Nat.Sci.Ed.)Vol.37No.8Aug.20094331,2,1,2(1,810008;2,,810001)[]43,,43(13,30),,(),151mg(0.09),;11/2,;,,;,;(0.09),;,75%,,89%,[];;;;[]Q944.1[]A[]167129387(2009)0820195209Acomparativestudyondiasporequalityandshapeof43plantspeciesatthealpinemeadowinthesourceregionofthreeriversWANGHui2chun1,ZHOUHua2kun2,WANGWen2ying1,ZhaoXin2quan2(1CollegeofLifeandGeography,QinghaiNormalUniversity,Xining,Qinghai810008,China;2NorthwestPlateauInstituteofBiology,KeyLaboratoryofAdaptationandEvolutionofPlateauBiota,ChineseAcademyofSciences,Xining,Qinghai810001,China)Abstract:ObjectiveThepaperstudiedthequalityandshapeofthediasporesof43plantspeciesin2volving13seedsand30fruitsfromalpinemeadowinthesourceregionofthreerivers.MethodThedia2sporesof43specieswerequantified,shapesofthemwerescaledwithvarianceofthreedimensions,andtherelationsbetweenaboveindexesandecologicalcharacteristicsofdiasporeswereanalyzed.ResultThere2sultsshowthatthequalityofasinglediasporeof15speciesislessthan1mg,anditsshapeisclosetosphe2ricitybecauseofvariancelessthan0.09,anditmighthavepersistentsoilseedbank,andisabletoadapttodisturbance.Thediasporesofperennialsareheavier,flatterandlongerthanthoseofannuals.Thediasporesofforbareheavier,andthoseofherbagesareflatterandlonger.Seedsareclosertosphericityincomparisonwithfruits.ThediasporesofmostofCompositaeandGramineaeandSedgesspeciesareflatandelongatedbecausethevarianceismorethan0.09.Theappendagesofdiasporesplayanimportantroleindispersalandestablishment.Thediasporesof75%Compositaespecieshavepappuses,andmightbedispersedbywind3[]2008212210[](30700563,30660120);973(2009CB421102,2005CB422005201);(KSCX22YW2N2040201);(KZCX22XB2206202)[](1974-),,,,,E2mail:[e-mail]©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:alpinemeadow;diasporequality;diasporeshape;survivalstrategy;thesourceregionofthreeriver,[1],[226],[3,7],[8211],,[12][13]43(1332),,,11.1,N34203422,E1002910030,38004800m,4120m,,,,;,,2500h,629.9623.8kJ/cm2;78,;,45,0;;420560mm,510,,(Kobresiahumilis),(K.pygmaea)(Scirpusdistigmaticus)(Poaspp.)(Stipaaliena)(Lagotisbrachys2tachya)(Leontopodiumnanum)(Ajaniatenuifolia)(Lanceatibetica)(Saussureasuperba)(P.kansuensisMaxim)[14]1.21.2.143,,13,[15],30,131,,100,5,143Table1Ecologicalcharacteristicsanddiasporetypesof43plantspeciesSpeciesFamilyEcologicaltypeLifeformAppendagesDiasporetypeArtemisiafrigidWild.CompositaForbSemi2shrubsNoneAcheneAsterflaccidusBungeCompositaForbPerennialPappusAcheneLigulariavirgaureaMattf.CompositaForbPerennialPappusAcheneLigulariasagittaMattf.CompositaForbPerennialPappusAcheneAnaphalislactealMaximCompositaForbPerennialPappusAcheneappus691()37©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:43©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.