26565.古爾班通古特沙漠南緣羽毛針禾種群生態(tài)功能與建群機制研究

1、石河子大學碩士學位論文古爾班通古特沙漠南緣羽毛針禾種群生態(tài)功能與建群機制研究姓名：馬大偉申請學位級別：碩士專業(yè)：植物學指導教師：劉彤20100501IIAbstractStipagrostispennataisapioneerplantinGurbantonggutDesertinNthernXinjiang.Itcanbelookuponasthefirstchosenplantfmigratydunerestation.Indert

2、ofindouttheabilityofStipagrostispennatapopulationhowthespeciespopulationgrowhowitpromotesotherspeciestosettleaplotof25m25matypicalplotof100m100mweresurveyed.Geostatistics’smethodwasappliedtodiagnosespatialpatternsofS.pen

3、nataSalsolacollinaRipley’sK(d)functionwereappliedtodiagnosespatialpatternsofS.pennataspatialassociationsbetweenS.pennataCalligonumleucocladumbetweenS.pennataHaloxylonpersicum.Theresultsshow:(1)Applingthesemivarianceanaly

4、sistheresultsofpatternindicated:thepatternsofS.pennatapopulationtheirseedlingsbelongedtoclusterdistributiontheranges(a)were1.84m0.57mrespectivelythepatternofS.collinabelongedtoclusterdistributiontherangewas8.12m.(2)Appli

5、ngtheRipley’sK(d)functionofpointpatterntheresultshowed:thesmallsizemediumsizeclass1oftheS.pennatapopulationareclusterdistributionpatternbelow38mshowromdistributionupon38mThemediumsizeclass2class3allS.pennatapopulationare

6、allclusterdistributionpatternbelow50mThemediumsizeclass4areclustersdistributionat2～17mscaleshowsromdistributionupon17mThelargesizeareclusterdistributionbelow47mshowromdistributionat47～50mscale.Itshowsallsignificantlyposi

7、tivecrelationbetweenmediunsizesmallsizelargesizesmallsizemediumsizelargesizeofS.pennatapopulationat0～50mscale.S.pennataisbothsignificantlypositivelyassociatedtoC.leucocladumH.persicumat0～50mscale.Itshows:S.pennatahasobvi

8、ousfacilitationeffectonseedgerminationecesisgrowthofC.leucocladumH.persicum.(3)ThelowganiccontentsshowedthesoilofS.pennataplothadfewnutrienttheelectricalconductivityCL，SO42contentswereallverylowwhichshowedthedegreeofsoil