全 文 :书!24" !1#
Vol.24 No.1
! " # $
ACTA AGRESTIA SINICA
2016$ 1%
Jan. 2016
犱狅犻:10.11733/j.issn.10070435.2016.01.001
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犚犲犵狌犾犪狋狅狉狔犈犳犳犲犮狋狊狅犳犛狋犻狆犵狉犪狀犱犻狊狅狀犃犫狅狏犲犵狉狅狌狀犱犅犻狅犿犪狊狊狅犳
犘犾犪狀狋犆狅犿犿狌狀犻狋狔犻狀犌狉犪狕犻狀犵犈犮狅狊狔狊狋犲犿
HUJing1,2,HOUXiangyang1,SARula1,LIXiliang1,2,WANGZhen1,DINGYong1
(1.InstituteofGrasslandResearchofChineseAcademyofAgriculturalScience,Hohhot,InnerMongolia010010,China;
2.GraduateSchoolofChineseAcademyofAgriculturalScience,Beijing100081,China)
犃犫狊狋狉犪犮狋:AgrazingdensityexperimentwasconductedinthetypicalsteppeofInnerMongolia.Basedon
theinfluenceofgrazingon5dominantspeciesinindividual,populationandcommunitylevel,respectively,
theexperimentexploredtheregulatoryeffectsof犛狋犻狆犵狉犪狀犱犻狊onabovegroundbiomassingrazingecosys
tem.Resultsshowedthat:Inindividuallevel,heightsofbunchgrass(犛狋犻狆犵狉犪狀犱犻狊and犆犾犲犻狊狋狅犵犲狀犲狊
狊狇狌犪狉狉狅狊犪)werenotaffectedbylightandmoderategrazing,whileheightsofrhizomegrass(犔犲狔犿狌狊
犮犺犻狀犲狀狊犻狊,犃犵狉狅狆狔狉狅狀犿犻犮犺狀狅犻and犆犪狉犲狓犽狅狉狊犺犻狀狊犽狔犻)weredecreasedwithgrazingtreatment.Therewas
apositivecorrelationbetweenplantheightandindividualbiomassingrazingecosystem.Inpopulationlev
el,犛狋犻狆犵狉犪狀犱犻狊wasnotsensitivetograzing,butthepopulationbiomassof犔犲狔犿狌狊犮犺犻狀犲狀狊犻狊,犃犵狉狅狆狔狉狅狀
犿犻犮犺狀狅犻,犆犾犲犻狊狋狅犵犲狀犲狊狊狇狌犪狉狉狅狊犪and犆犪狉犲狓犽狅狉狊犺犻狀狊犽狔犻showedpositivecorrelationtotheirrichness.In
communitylevel,communitybiomasswasregulatedbybiomassof犛狋犻狆犵狉犪狀犱犻狊,whichhasthehighgraz
ingtolerance.Inlightandmoderategrazingtreatment,犛狋犻狆犵狉犪狀犱犻狊wasthebeneficiarywithintheredis
tributedresource.Compensatorygrowthof犛狋犻狆犵狉犪狀犱犻狊bufferedthedisturbanceofgrazing,andregula
tedthecommunityproductionandfunctionalstability.
犓犲狔狑狅狉犱狊:犛狋犻狆犵狉犪狀犱犻狊;Grazingecosystem;Typicalsteppe;Abovegroundbiomass;Individualpopula
tioncommunity
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Table1 Speciesandabovegroundbiomasscharacteristicsinungrazingplot
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Species
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Abovegroundbiomass/g·m-2
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Alocation/%
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Cumulativealocation/%
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YZ[犛狋犻狆犵狉犪狀犱犻狊 124.87 51.77 51.77 27.18
v-犔犲狔犿狌狊犮犺犻狀犲狀狊犻狊 34.70 14.39 66.16 52.54
z{|-犃犵狉狅狆狔狉狅狀犿犻犮犺狀狅犻 36.30 15.05 81.21 60.41
klm-犆犾犲犻狊狋狅犵犲狀犲狊狊狇狌犪狉狉狅狊犪 10.00 4.15 85.36 85.21
wxy-犃犵狉狅狆狔狉狅狀犮狉犻狊狋犪狋狌犿 9.26 3.84 89.20 71.94
XRemainingspecies 26.07 10.80 100.00 40.40
ü:g&X»OP9K`ظué3%TKGã6
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Table2 ANOVAanalysisfortheeffectofgrazingrate(G)andspecies(S)onindividualbiomassandheight
ê©5mFixedfactor 犱犳
rs Height MN9K`Individualbiomass
犉 犘 犉 犘
>? Grazing(G) 5 78.060 <0.001 8.552 <0.001
KGSpecies(S) 4 93.109 <0.001 70.199 <0.001
>?Ý×KG G×S 20 6.207 <0.001 3.032 <0.001
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Fig.1 Theeffectofgrazingonplantheight
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Fig.2 Theeffectofgrazingonindividualbiomass
=3 +,st,1Wz{9>r
Fig.3 Thecorrelationanalysisof
individualbiomassandheight
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Table3 ANOVAanalysisoftheeffectofgrazingrate(G)andspecies(S)onpopulationbiomassandrichness
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Fixedfactor
犱犳
GO9K`Populationbiomass GOA Richness
犉 犘 犉 犘
>?Grazing(G) 5 8.136 <0.001 2.748 0.017
KGSpecies(S) 4 130.964 <0.001 37.569 <0.001
>?Ý×KGG×S 20 6.870 <0.001 2.468 0.001
=4 %&$c~+,e-a2|u
Fig.4 Theeffectofgrazingonrichnessofplants
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Fig.7 Theeffectofgrazingoncommunitybiomassandalocationofplant
8
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犃犵狉狅狆狔狉狅狀犮狉犻狊狋犪狋狌犿
SR0.0 0.972 0.976 0.972 0.970 0.929 0.946
SR3.0 0.963 0.909 0.963 0.872 0.928 0.953
SR4.5 0.973 0.897 0.973 0.904 0.888 0.981
SR6.0 0.906 0.689 0.906 0.885 0.877 0.956
SR7.5 0.926 0.801 0.926 0.726 0.648 0.649
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11