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1、(5)采用Shannon-Wiener指数和Levins指数对物种生态位宽度的度量表征了相似的结果，虽然个别物种在排名位置上出现顺序颠倒，但总体趋势一致。重要值大的物种生态位宽度一般也大。13个优势种之间的生态位重叠较大，主要集中在0.4-0.8之间，重叠值在0.6・0.7之间的种对数所占的比例最大，约占所有种对个数的25%o【尖键字】ward最小方差聚类；PCA；多重比较；物种多样性；回归模型；AIC【论文类型】基础研究Title:StudyontheQuantitativeEcologyofPlatycladusorientailsCommunityinShanx
2、iHuoshanMajor:EcologyName:WuYujiaoSignature:Supervisor:BiRunchengSignature:AbstractBasedonthefieldsinvestigation,whichselectedShanxiHuoshancharacteristicsofFfyfaisaettcommunitieswerestudiedbyusingquantitativeecologymethodology,includingspeciescomposition,flora,Wardminimumvariancecluster
3、ing,PCAordination,speciesdiversity,sothattheseresultscanbeastheoreticalbasisforecologicalconservationofthisspeciesandscientificunilization.Theresultshowedthat：(1)Therewere82kindsofvascularplants,belongingto33familiesand67genera,includingferns1family,1genusand1species,gymnosperms2family,
4、2generasand3species,angiosperms30families64genera78species.Theregionofgymnospermsandangiospermsbranchnumberrespectivelythenumberofgymnospermsandangiosperms,ShanxiProvincewere33.33%and21.9%;Theregionofgymnospermandangiospermgenerarespectivelygymnosperms,ShanxiProvince,thenumberofangiospe
5、rmsis15.38%and7.97%.Shanxibiotaorientaliscommunitiescanbedividedintofivefamiliesarealtypes,amongthem,thewidespreadtypewasthemostandNorthtemperateandSouthAmericadisjunctionwasinthenextplaceinthearealtypesoffamilies.Plantsintheregioncanbedividedinto14arealtypes,amongthem,thenorthtemperate
6、wasthemostandthewidespreadtypewasinthenextplaceinthearealtypesofgenus.(2)Classifyingthe23samplesofcommunityusingtheminimumvarianceclusteringmethod.AccordingtotheprincipleandsystemclassificationofChinavegetation,combinedwiththeactualsituationofinvestigationanddominantspeciesnamedcommunit
7、ytypes,couldbedividedintosixassociationofF^cfeoLsaettcommunity.Samplesalongthefirstaxis,fromlefttorightgraduallyfromlowtohighelevation,showedthatthefirstaxisrepresentsthechangesofelevation.Samplealongsecondaxis,fromtoptobottomthedegreeoftheslopeincreasesgradually,suggeststhatth
