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1、石河子大學(xué)碩士學(xué)位論文古爾班通古特沙漠南緣植被物種多樣性及其分異研究姓名：劉忠權(quán)申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：植物學(xué)指導(dǎo)教師：劉彤201106IIAbstractStudyontheplantcommunitydiversityinsouthernpartofgurbantunggutdesertfocusesonthecompositionofplantspeciesdiversitydistributionofthedifferentac

2、teristicsoftheplantlifefmsrelationshipbetweenephemeralplantstheenvironmentaswellasshtlivedtwoyearschangesinplantdiversitythisstudywillbeusefulcatalogingwiththeregionalvegetationdiversitylongtermdynamicmonitingtheestablis

3、hmentofprotectionareasprotectionofvegetationsustainablemanagementsoon.Theconclusionsareasfollowing:1.InvestigationofthedesertsouthofGurbantunggut35siteswhichcoveratotalareaof3.86104m2inthesouthernpartoftheGurbantunggutDe

4、sert.Atotalof93speciesbelongingto24families74generaarefoundofwhichfamilieslikeChenopodiaceaeCompositaeCruciferaeLeguminosaearedominanttakingup19.35%17.20%11.83%9.68%ofthetotalspeciesrespectively.Intermsoflifefmsephemeral

5、smakeup53.76%herbageplantwithlongperiodofnourishmentaccountf22.58%arbshrubmaheup16.13%.Intermsofimptantvaluearbshrubsaccountto30.93%ephemeralsacountf45.73%.2.Weusetwowayindicatspeciesanalysis(TWINSPAN)dividedtheephemeral

6、slivinginthesouthernpartoftheGurbantunggutDesertinto7communities.SpeciesdistributionisfoundtobegreatlyinfluencedbyslopepositionslongitudelatitudeannualprecipitationprecipitationfromMarchtoMaythroughdetrendedcanonicalcres

7、pondenceanalysis(DCCA).3.Thespatialvariationoftheplantlifefmsaredistinct:inlongitudethespeciesnumberimptantvalueofephemeralsincreasesignificantlywiththeincreaseoflongitude(fromwesttoeast)whiletheimptantvalueofherbageplan

8、twithlongperiodofnourishmentarbshrubdecreaseswiththeincreaseoflongitudeinlatitudethespeciesnumberimptantvalueofephemeralsdecreasewiththeincreaseoflatitude(fromsouthtonth)whiletheimptantvalueofherbageplantwithlongperiodof

9、nourishmentarbshrubincreaseswiththeincreaseoflatitudetherearenodistinctchangeinspeciesnumber.4.Slopebetweenthedifferenttypesoftheplantlifefmscoverofdifferentlifesignificantdifferenceexpressedas:“arbshrub”ephemeralsannual

10、swithlongperiodofnourishmentperennialweed.Meandensityexpressedas:ephemeralsannualswithlongperiodofnourishmenthavelargedensity.Overalllessdensetopofthehillgreaterdensityoftwoslopesshowedsignificantivedistribution.5.Epheme

11、ralplantcoverofdifferentplantcommunitiesissignificantdifferencebetweentwoyearexpressedas:greaterdegreeofplantcoverin2010butdensitydiversityindexchangeisnotveryclear.KeywdsGurbantunggutDesertspeciesdiversityDetrendedCanon

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