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2010,30(1):00790085ActaEcologicaSinica(2006BAD26B05):20080918;!!:20090225*Correspondingauthor.Emai:lyangxh@forestry.ac.cn喻!泓,杨晓晖*(,,!100091):,,,Kriging,;12a1a;,,,,:;;;;;VariationofcompetitionintensityacrossachronosequenceinsurfacefiremediatedMongolianpineforestYUHong,YANGXiaohui*ResearchInstituteofForestry,ChineseAcademyofForestry,KeyLaboratoryofTreeBreedingandCultivation,StateForestryAdministration,Beijing100091,ChinaAbstract:FireisacrucialdisturbancefactorinMongolianpineforest.Undertheapproachofspacefortmiesubstitution,competitionintensitiesoftreeswereexploredusingthelongtraditionofdistancedependentcompetitionindexintwo1hm2fullymappedplotsofMongolianpineforestacrossachronosequenceofdifferentintervalsoftmiesincefire,inHulunBuirsandregion,InnerMongolia,China.Recruitswerealsoestmiatedusingthegeostatisticsmethodofkrigingina1994burnedstand(B94).Ourresultsshowthat(1)competitionintensitiesofsurvivalcomponentswereallsignificantlylowerthanthoseofpremortalityagents;(2)competitionintensitiesofsurvivalcomponentsinB94weresignificantlylowerthanthoseofcorrespondingcomponentsinB06(a2006burnedstand);(3)mostrecruitsinhabitedinthegapstriggeredbysurfacefireinB94.Thus,competitionintensitywoulddecreasecontinuouslyandsignificantlyacrossthechronosequence.Thesurvivalcomponentsmayhavemoreresourcesandspacetoliveonduetothedmiinishmentsofcompetitionintensitiesofstems,whicharedrivenbysurfacefire,adynamicdrivingforceinthedevelopingprocessofMongolianpineforest.KeyWords:chronosequence;competitionindex;geostatistics;Mongolianpine;standcomponent;surfacefire[1],[2],[1][1,3],,,[4],,[1,3][5],[6],,[610],(PinussylvestrisL.var.mongolicaLitv.)[11],[1112][1213],,[4,12],;,?,?,?,[1415],,,1!1.1!,[12]2006200767,[11]2100m,199441618(B94,1994)[14]200651618(B06,2006)[15],()()(B06)(1.3m),(DBH,1.3m1.3m);,,[12,16],B94,,1002m∀2m10m,B06B94568#hm-2379#hm-2,140#hm-21#hm-2B06B94()2256#hm-2506#hm-2,633#hm-21#hm-21.2![17],Hegyi[7],[67,1718],,,,,[6,9,18],:CI=1N∃Ni=1∃nj=1D2jD-1iL-1ij(1),CI,N,ni,Djj,Dii,Lijij,,,1hm2,,,()[9],[9][19][18]Voronoi[10][20],,10m[21],58m;,,10m[22],10m,(1R3),,,10m,80!!!!!!!30!∀80m(0.64hm2),(1),2,,,,,12a,B94[13,21],1.3m,B9412a,,,[23],B94,Kriging,R,GS+5.0,SAS9.01!2006(a)1994(b)Fig.1!Mapsof(a)B06(the2006burnedplot)and(b)B94(the1994burnedplot)(%),(&),(∋),((),(∀);,,R1R2R3,10m2!2.1![16],,[12],;,,,,0.01(1),,(),2.2!B06B941436311(1),74.3%24.8%,1019.9cm,(2)B06B942152467(1),74.8%25.3%,10cm,1019.9cm81!1!!!!:!(2)1!*Table1!StatisticsofbarkcharheightsinstandssurveyedPlotSamples()/cmBarkcharheights(standarderror)MedianStandarddeviationMinimumMaximumB062255150.2(2.68)a107.0127.312880B94482139.5(3.50)a132.076.810410!!*KruskalWallis0.012!*Table2!Comparisonoftargetsandneighborsinstandssurveyed/cmSizeclassStatisticsTargetB06DB06SB94DB94SNeighborB06DB06SB94DB94S09.9Samples1066138422616072016437Mean2.2(0.04)a5.4(0.17)A5.5(0.38)b6.0(0.42)A2.2(0.03)a5.6(0.14)A5.6(0.31)b5.8(0.34)A1019.91262530353394211.2(-)12.9(0.50)A13.9(0.53)15.6(0.50)B11.8(1.25)a13.1(0.37)A13.4(0.42)a15.7(0.45)B2029.9-62859-841391-25.8(0.35)A22.8(0.78)26.0(0.35)A-26.0(0.29)A22.2(0.55)25.7(0.32)A3039.9-107290-1512136-34.5(0.27)A31.8(0.80)35.0(0.32)A-34.4(0.22)A31.8(0.8)35.1(0.25)A4049.9-28-29-41-43-43.8(0.48)A-43.0(0.51)A-43.8(0.38)A-42.8(0.39)A)50-8---12---53.6(1.31)---54.3(1.19)--1067369772341610542118349Allstems2.2(0.04)a21.8(0.77)A10.7(0.82)b28.0(0.74)B2.2(0.04)a21.5(0.64)A10.5(0.61)b28.1(0.60)B!!*,,0.01,;DS2.3!,B06;(14.88),(0.01);,,(3)12a,B94590%;,23(3),,B06B94,(3)(2),B06B94,B06(,2=950.3418,P0.0001),(12a),,,2.4!B94,,(0.9090.0091),(C0)(C0+C)0.403,KrigingB9482!!!!!!!30!(2)3!*Table3!ComparisonofcompetitionintensitiesofthecomponentsacrossachronosequenceinfiremediatedMongolianpineforestStandcomponentsB06Samples()Mean(SE)B94Samples()Mean(SE)Intraspecificaccompanyspecies3440.31(0.0161)--DeadtreesIntraspecificMongolianpine7330.76(0.0284)a773.64(0.4500)bInterspecificaccompanyspecies3340.14(0.0112)--InterspecificMongolianpine7330.22(0.0077)--Alldeadstems106714.88(0.4142)a773.64(0.4500)bIntraspecificaccompanyspecies920.25(0.0292)--SurvivalsIntraspecificMongolianpine2771.35(0.1182)a2341.02(0.0867)bInterspecificaccompanyspecies924.52(0.2693)--InterspecificMongolianpine2770.01(0.0016)--Allsurvivalstems3692.32(0.1402)a2341.02(0.0867)bIntraspecificaccompanyspecies4260.49(0.0226)--AllstemsIntraspecificMongolianpine101012.09(0.4544)a3111.73(0.1466)bInterspecificaccompanyspecies4269.35(0.3360)--InterspecificMongolianpine10100.32(0.0120)--Allstems143611.65(0.3420)a3111.73(0.1466)b!!*0.01!2!B94,,DBH)30cmFig.2!SpatialpatternofrecruitspostfireinB94.Greyscalestandsthedensityofrecruits,andcirclessurvivalswithDBH)30cm3![2,11],[1][1213]3.1!2050[11],,,,(20cm),(2),;,()[3],B06B94,(1),(),,(),83!1!!!!:!![20],,[12],B06B9445(2)B06B94,(,2=636.1,P0.0001)1019.9cm,(2),,(B061688,10cm99.8%),B06748%;12a,B94()0.932.6cm,10cm54.3%,12a25.1%,,,,,B0611.652.32;B94(1.02)59%,B0610%(3)