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1、(5)采用Shannon-Wiener指數(shù)和Levins指數(shù)對(duì)物種生態(tài)位寬度的度量表征了相似的結(jié)果,雖然個(gè)別物種在排名位置上出現(xiàn)順序顛倒,但總體趨勢(shì)一致。重要值大的物種生態(tài)位寬度一般也大。13個(gè)優(yōu)勢(shì)種之間的生態(tài)位重疊較大,主要集中在0.4-0.8之間,重疊值在0.6?0.7之間的種對(duì)數(shù)所占的比例最大,約占所有種對(duì)個(gè)數(shù)的25%o【尖鍵字】ward最小方差聚類;PCA;多重比較;物種多樣性;回歸模型;AIC【論文類型】基礎(chǔ)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