29431.古爾班通古特沙漠南緣植物群落多樣性與植被覆蓋變化分析

1、新疆農(nóng)業(yè)大學(xué)碩士學(xué)位論文古爾班通古特沙漠南緣植物群落多樣性與植被覆蓋變化分析姓名：劉乾申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：森林經(jīng)理學(xué)指導(dǎo)教師：李霞20090501StudyonthePlantCommunityDiversityandVegetationcoveragechangesinthesouthofGurbantunggutDesertAbStractTaldngfieldsurveydatatheCEBERSdataofyear200l，

2、2005，2008astheinformationsources；takingtheRestorationEcology，thevegetationecologyasthetheoreticalbasis；takingthesouthrimofGurbantunggutasresearchareausingthestatisticalmethodandtheremotesensingandgeographyinformationtech

3、nologyhasanalyzedthemultiplecharacteristicsofplantcommunityintheresearchareaevaluatedthevegetationdegreeofcoverageandresearchedtheareadegreeofvegetationcoveragechangesin20012008Themainresultsshowed：Therearesixkindsofplan

4、tcommunitiesintotalnecommunitymultiplicityfromlowinturnareErodiumoxyrrhynchumcommunity，CeratocarpusarenariuscommunityCarexphysodescommunitytheCnnigonummongolicumcommunitytheReaumuriasoongoricacommunityandtheReaumuriasoon

5、goricacommunityOnthewholesincethemoisturecontentconditionsintheresearchareaarebasicallysimilarthespeciesmultipledifferencesoftheplantcommunityarenotbigAmongthem，themultiplicityandabundanceofherbcommunityarebiggerthantheb

6、ushcommunitywhilethedominanceislowerFromtheearthenmoundbetweentothesandduneontheparameteroftheplantmultiplicityadvancesgraduallyChangesamongcommunitymultiplicityofthenorthandsouthtowardsplant。dominanceanddegreeofcoverage

7、arenotbigtheIandformshapedifferencesofextendsinthedirectionwiththesanddunearenotremarkabieTheyareincertaincorrespondingrelationsThedistributedruleofplantcommunitytnresearchareaare“1heC口|ligonummongolicumscatteredfragment

8、arilyinthenorthandsouthtowardsoftheleewardslopeintheearthenmoundslopeandthesummitInfactdirectlytheseedseedlingaresurvivalinhalffixedsandduneagainstthewindslopeTheReaumuriasoongoricadistributesintheeastandwesttowardsofthe

9、sanddunebetweentheearthenmoundthefiatland，thereisnothinginthesummitBecausethespecificityofgrowingoftheCeratocarpus(ground，undergroundallcansolid)，thecompatibilityisstrong，itcallgrowindifferenttowardsofthesandduneinthenor

10、thandsouthoneachslopepositionCarexphysodesdistributesbothintheearthenmoundandvariousslopefacesanditgrowsmoredenselyintheearthenmoundbetweenTheHaloxylonammodendronhasstrongcompatibilitytothedesertadversecircumstance。itist

11、hemostwidespreadspeciesintheresearchareaInviewofthecharacteristicofQlBandtheCEBERSdatatoestimatethetwokindsofdatatocarryonthevegetationdegreeofcoverageseparatelywithdifferentmethodstheresultindicatethatbasedontheQfBdatav

12、egetationindices，ndvimethodforregressmodel，dimidiatepixelmodel。improvedimidiatepixelmodelis8444％，9408％，9785％，theelementdichotomyestimationeffectisbestBasedontheCEBERSdatavegetationcoverageestimation，taketheQBelementdicho

13、tomyestimatedegreeofcoverasthetruevalue，thevegetationexponentialmethod，thereturnmodeling，theelementdichotomytheimprovementelementdichotomyestimationprecisionrespectivelyis7778％，9755％9735％and9888％。theimprovementelementdic

14、hotomysimplepracticalalsoisidenticalwiththeactualsituationoffittheprecisionishighestConsideringthecomprehensivefactoresvegetationcoverageestimationprecision，costanddataarewhethereasytobeobtainedandsoonwhencarriesonthewid

15、erangeandlongtimevegetationcoveragechanginganalysis，thebestprojectisbasedontheCEBERSdataelementdichotomyplan。BasedontheCEBERSdatatoanalyzethevegetationdegreeofcoveragechangingofresearchin20012008withtheelementdichotomyth

16、eresultindicatesthattheresearchareavegetationcoveragereducesin20012005，thedegreeofcoverageon42750hm‘in02aboveshiftedto02below；in2005—2008，vegetationdegreeofcoverage10860hm2in02belowtransfo丌nt002aboveTheimplementationofna