30173.南美蟛蜞菊入侵海南島機理研究

1、海南師范大學碩士學位論文南美蟛蜞菊入侵海南島機理研究姓名：司春燦申請學位級別：碩士專業(yè)：生態(tài)學指導教師：杜道林20090601AbstractWedeliatrilobata(L)HitcheisaperennialrhizomaticplantnativetoSouthAmericaandCentralAmerica；itwasintroducediIlt0Chinaasornamentalplantin1970’S，andhasbe

2、comeoneofthedetrimentalweeedsinregionofSouthChinaandotherseaside，theinvasionofⅥ，edelifltrilobata(L)HitchchascausedsevereimpactsonnativebiodiversityoftheseplacesThepurposeofthepresentstudyistoinvestigatethemechanismsunder

3、lingitssuccessfulinvasion，andtrytofindsomeeffectivewaysforitscontr01Thisworkincludedthefollowingthreeaspects：1ResearchtheinfectionandevaluationofvegetablediversityonHainanIslandcausedbyinvasionofWedeliatrilobata(L)Hitchc

4、theresultsshowedthattheinvasionofWedeliatrilobata(L)HitchchadalargeeffectsonspeciescomposingandvegetablediversityofplantcommunityonHainanIslandWedeliatrilobata(L)Hitchcinvadedmoreseverelythespecieswaslowerthevegetablediv

5、ersityoftheplantcommunityWassmaller2Wecomparedintemodelength，branchingintensitybranchingangle，frequencydistributionofintemodelengthfrequencydistributionofspacerlength，rametpopulationdensityandrametheightofWedeliatrilobat

6、a(L)HitchcamongtwohabitasincludingthewildandindoorTheresultrevealthatcharactersof融，／atrilobata(L)Hitchcsuchasspacerlengthandbranchingangledifferedamonghabitats，whilebranchingintensitydidnot14色de／／atrilobata(L)Hitcheexpre

7、sseshighlyadaptiveandplasticecologicalstrategytoenviroment3Byusingintersimplesequencerepeat0SSR)makers，thispaperstudiedthegenticvariationofI琵de／／atrilobata(LHitchcfrom480accessions，andgeneticstructurebetweenthe8populatio

8、nsThemainresultswerefollows：(1)Atotalof5ISSRprimerswereemployedon480individualsofWedeliatrilobata(L)Hitchcfrom59primers，and66scorableamplifiedpolymorphicweredetected，ofwhich65@PL9848％)werepolymorphiclociGeneticdiversitya

9、nalysisshowedthatNeisgenediversity(He)was02188andShannon’sgeneticdiversityindex(／)was03504inspeciesWedeliatrilobata(L)HitchchadahiighlevelofgeneticdiversityThetotalgeneticdiversity(Gs0was04095Geneticdifferentiationmainly

10、occurredwithinpopulations(5902％)，andwithoutpopulations(4098％)ThepotentialofinvasionanddistributionarcextremelystrongThesecharacteristicsmadeitspreadrapidlyandmultiplyInordertocontrolitsfurtherspread，weshouldintensifyeffo