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Variation Analysis of Tracheid Characteristics and Microfibril Angle Among Species and Hybrids of Larix spp.

落叶松种间及其杂种管胞特征及微纤丝角的变异



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 2011,24(4):415 422
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VariationAnalysisofTracheidCharacteristicsandMicrofibrilAngle
AmongSpeciesandHybridsofLarixspp.
SUNXiaomei1,CHUXiuli1,ZHANGShougong1,DINGBiao2,ZHOUDeyi2
(1.ResearchInstituteofForestry,ChineseAcademyofForestry;KeyLaboratoryofTreeBreedingandCultivation,StateForestryAdministration,
Beijing 100091,China;2.DagujiaForestFarminQingyuanCounty,Qingyuan 113305,Liaoning,China)
Abstract:Thevariationsintracheidcharacteristicsofearlywoodandlatewoodof4speciesofLarixspp.andtheir
hybridswithL.kaempferiasfemaleparentwerestudied.Theresultsareasfolows:Thetracheidcharacteristicsand
microfibrilanglemetorsurpassedtherequirementsneededforsuperiorpulpandpaperproperties.Thereweresig
nificantorextremelysignificantdiferencesinthetracheidcharacteristicsofearlywoodandlatewoodamongthespe
ciesandhybrids.Thevariationsoftracheidlengthforearlywoodandlatewoodwere316445-386526μmand
331851-420087μmrespectively.Theratiosoftracheidlengthtowidthvariedbetween5710and7293and
11795and14650forearlywoodandlatewoodseparately.Andthatforinternaldiameterinradialdirectionwere
3896-4668μmand1076-1292μmforearlywoodandlatewoodindividualy.Bothofthetracheidlengths
andtheratiosoftracheidlengthtowidthforearlywoodandlatewoodofL.kaempferiwerelargerthanthatofL.prin
cipisrupprechti,L.olgensisandL.gmelini.L.kaempferiismoresuitabletobeusedaspulpandpaperrawmateri
althantheotherthreespeciesofbasedonthetracheidcharacteristics.Mostofthetracheidcharacteristicsofthe3
hybridswereclosertothatofL.kaempferi81,thefemaleparent,andsurpassedthatoftheirpaternal,especialy
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theinterspecifichybridsofL.kaempferi×L.olgensis,andL.kaempferi×L.gmelinifarsurpassedthevaluesof
theirpaternalspecies.Theradialvariationoftracheidlength,whichisbelongedtoPashinⅡ,increasedsharplyat
firstandthenkeptatasteadyvaluesbothforearlywoodandlatewood.Theradialvariationoftracheidwidthforear
lywoodandlatewoodandthetracheidinternaldiameterinradialdirectionforearlywooddidnotchangemuchwith
age.Howeverthetracheidinternaldiameterinradialdirectionforlatewooddisplayeddecreasedtendencyduringthe
observedperiod.ThetechnicalmaturityofLarchstandsforpulpandpaperusingshouldbebetween15and20years
oldaccordingtheradialvariationintracheidtraits.TheyoungtreesofLarixspp.whichareunder20yearsoldare
moresuitableforpulpandpaperthanolderonesbecauseofratiosofwaltocavityforlatewoodoftheolderarelarger
whichwouldafectthequalityofpaper.
Keywords:Larixspp.;species;hybrid;tracheidcharacteristic;microfibrilangle;variation
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