搜索
2000,20(2):259267ActaBot.Boreal.-Occident.Sin.:1000240252(2000)0220259209(,610041):(X1)pH(X2)(X3)(X4)4,18(),,,(R2=0.104),(Y),:Y=-88.29-0.056X1+0.812X2+0.314X3+0.028X4(P0.05),,X4X1,93.5%,Gough(1994),,,,:;;;;:Q941:AThespeciesrichnessandbiomassofplantcommunitiesalongenvironmentalgradientsinthenorthshoreofQinghailakeLIUQing(ChengduInstituteofBiology,ChineseAcademyofSciences,Chengdu610041,China)Abstract:EighteenplantcommunitiesandtheirenvironmentalfactorsweresurveyedbyquadratsinthenorthshoreofQinghaiLake.Inthestudybiomass,speciesrichnessoftheseplantcommunityandrelationshipbetweenthemwereanalyzedinthedifferentenvironmentalgradients:soilpH,moisture,saltandaltitude.Inaddition,ageneralmodel:1998211223:(KZ9512A12104203202):(1965),(),,,ofrelationshipsamongstvariablescontrollingobservedrichnesswasproposed.Theresultsshowedthatabovegroundlivinganddeadbiomasscombinedofplantcommunitieswasfoundtobeweaklycorrelatedwithspeciesrichness(R2=0.104).Speciesrichnessshowedmultiplelinerelationshipwithfourenvironmentalfactorsindices,andtheregressionmodelasbelow:Y=-88.29-0.056X1+0.812X2+0.314X3+0.028X4(P0.05).Elevationandsoilmoisturewerecloselyrelatedtospeciesrichness,andtheirtotalpercentagecontributiontoR2was93.5%.ThedataalsosupportLauraGouthpsgeneralmodelofproposedrelationshipsamongstvariablescontrollingrealized(observed)richness,whichsuggestedthatbiomasswasnotanadequatepredictorofspeciesrichnessinasite,ofparticularimportancewasmodelsdevelopedtopredictspeciesrichnessshouldincorporatedirectmeasurementsofenvironmentalfactorsaswellascommunityattributessuchasbiomassinordertoincreasetheirapplicability.Keywords:plantcommunities;speciesrichness;biomass;environmentalgradient;QinghaiLake1(speciesrichness,SR)[1],(communitybiomass,CB)[28]CBSR[9,10]Grime(1979)(speciesdensity,)(hump2shaped),,SRCB,[4],[11],SR,,[11]Grime(1973),CBSR(unimodal)[12],WheelerGiller(1982)34[2],,Gough(1994),[13],(realizedrichness)(potentialrichness),,,,SRCB,,06220,,[14],[1518],,,,Gough2,,36153820,975010120,50[13],[14],,,-0.5,-31370.3mm,69502mm,(Achnatherumsplendens)(Stipabreviflora),,:()[15],18[1516,18],33.13,,18[16]19978()1m1m(,[16])10,;0.25m2,,,80,,4[15],;2020cm,pH[19]3.2,[1]10,SPCOVAR.BAS1622:PCREG.BAS[20],586Pearson,;pH;,V2[21];WMREG21Table1CommunitydataandenvironmentalfactorcharactersofplantcommunitiesinthenorthshoreofQinghailakeCommunitynumberSoilmoisture(%)pHSoilpHSoilsalt(%)Altitude(m)SpeciesrichnessBiomass(göm2)C17.068.100.67432006.0483C24.078.060.43732104.3291C33.318.150.06632456.3394C45.687.850.12432157.2561C59.368.130.414320012654C62.137.330.04932055.3376C72.488.120.022324010744C82.827.930.05032908.9396C965.328.940.08132105.5314C1015.228.760.07932205273C1117.588.360.07832255581C121.348.820.017323011217C132.038.200.038324011.5325C1419.738.110.814324591075C151.728.470.016325510502C162.287.990.023326511.2795C177.577.470.04932209.7463C188.688.730.16532606.0538C1.+;C2.;C3.+;C4.+;C5.++;C6.+;C7.+;C8.++;C9.;C10.++;C11.++;C12.+;C13.+;C14.+;C15.+;C16.++;C17.+;C18.C1.Comm.Puccinelliatenriflora+Glauxmaritima;C2.Comm.Clematistangutica;C3.Comm.Leymussecalinus+Thesiumchinensis;C4.Comm.Poatibetica+Potentillaanserna;C5.Comm.Poapoophagorum+Carexmoorcroftii+Thermopsislanceolata;C6.Comm.Carexspp.+Artemisiadesertorum;C7.Comm.Leymussecalinus+Artemisiadracunculus;C8.Comm.Kobresiahumilis+Stipapurpurea+Artemisiadesertorum;C9.Comm.Eleocharisvallculosa;C10.Comm.Triglochinpalustre+Blysmussincompressus+Kobresiamacrantha;C11.Comm.Blysmussinocompressus+Eleocharisquinqueflora+Pedicularislongifloravar.tubiformis;C12.Comm.Potentillaanserina+Oxytropisfalcata;C13.Comm.Saussureathoroldii+Blysmussinocompressus;C14.Comm.Irislacteavar.chinensis+Hordeumroshevitzii;C15.Comm.Agropyroncristatum+Potentillabifurca;C16.Comm.Achnatherumsplendens+Artemisiascoparia+Carexivanoviae;C17.Comm.Stipapurpurea+Poapoophagorum;C18.Comm.Stipabreviflora.44.118pH26220(göm2)11,(1)1CBSRFig.1Relationshipbetweentotalabove2groundcommunitybiomass(live+dead)andspeciesrichnessinthenorthshoreofQinghailake,(R2=0.104,P0.1)1,,;,,,Grime(1979):;(potentialrichness),,4.22SRCBFig.2Relationshipbetweenelevation(1=lowest,2=intermediate,3=highest)and(A)speciesrichnessperm2(P0.01)or(B)totalabove2groundbiomass(live+dead)perm2(P0.01)inthenorthshoreofQinghailake4.2.118:1()32003230m,10;2()32303260m,6;3()32603290m,23622:2A2B2,,,,[22],,,()[15],3CBSRpHFig.3RelationshipbetweensoilpHand(A)speciesrichnessperm2(P0.01),or(B)totalabove2groundbiomass(live+dead)perm2(P0.01)inthenorthshoreofQinghailake(notesseeinthetext)4CBSRFig.4Relationshipbetweensoilmositureand(A)speciesrichnessperm2,or(B)totalbiomass(live+dead)perm2inthenorthshoreofQinghailake4.2.2pHpH4:1pH7.007.50,2;pH7.508.00,3;pH8.008.50,7;pH8.509.00,2394pH,,pH,,4.2.31,C9(),65.32%,17(1%20%),C94AB,(R2=0.241,P0.05);(R2=0.304,P0.05)462204.2.4,,R20.0220.143(P0.1),V2,(P0.1)4.3(Y)(X1)pH(X2)(X3)(X4),4,,4:Y=-88.29-0.056X1+0.821X2+0.314X3+0.028X4(R2=0.219,P0.05),42.1%,pH5.0%,1.5%,51.4%,5SRCBFig.5Relationshipbetweensoilsalt(%)and(A)speciesrichnessperm2,or(B)totalabove2groundbiomass(live+dead)perm2in