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Morphological and Functional Heterogeneity of Fine Roots among Three Tree Species in the Hilly Region of Central Sichuan

川中丘陵区3个树种的细根形态和功能异质性分析



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,2016,36(5):1012-1020
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犕狅狉狆犺狅犾狅犵犻犮犪犾犪狀犱犉狌狀犮狋犻狅狀犪犾犎犲狋犲狉狅犵犲狀犲犻狋狔狅犳犉犻狀犲犚狅狅狋狊犪犿狅狀犵犜犺狉犲犲犜狉犲犲
犛狆犲犮犻犲狊犻狀狋犺犲犎犻犾狔犚犲犵犻狅狀狅犳犆犲狀狋狉犪犾犛犻犮犺狌犪狀
LIUYunke1,SUYu1,LIDehui1,2,FANChuan1,XIEYutong1,LIXianwei1
(1ColegeofForestry,SichuanAgriculturalUniversity,Chengdu611130,China;2MianyangNormalUniversity,Mianyang,
Sichuan621000,China)
犃犫狊狋狉犪犮狋:Takingthefinerootsof犆犻狀狀犪犿狅犿狌犿狊犲狆狋犲狀狋狉犻狅狀犪犾犲and犜狅狅狀犪狊犻狀犲狀狊犻狊whichwereplanteddur
ingearlypreliminarystageoflowefficiency犆狌狆狉犲狊狊狌狊犳狌狀犲犫狉犻狊foreststransformationinthehilyregionof
centralSichuanasresearchobjects,whileusingtheunmodifiedpure犆.犳狌狀犲犫狉犻狊forestascontrol,wede
terminedinsiturespirationratesbyapplyingaLI8100soilcarbonfluxmeasurementsystemofthe1st-
5thorderrootsanddiscussedtherelationshipamongthemorphologicalstructureandthenutrientconcen
trationoffinerootsandrespirationtorevealthestructuralandfunctionalheterogeneityoffineroots.The
resultsshowedthatthediameteroffineroots,rootlengthandtissuecarbonconcentrationof犆.狊犲狆狋犲狀狋狉犻
狅狀犪犾犲,犜.狊犻狀犲狀狊犻狊and犆.犳狌狀犲犫狉犻狊increasedwiththerootsorderincreased,whilespecificrootlength
(犛犚犔),tissuenitrogenconcentrationandspecificrootrespirationrate(犛犚犚)reduced.Andspecies,root
orderandtheirinteractionsshowedthatthemorphology,nutrientconcentrationsand犛犚犚ofthesethree
speciesfinerootswerehighlysignificanteffect(犘<0.01).Regressionanalysisindicatedthatthreespecies
犛犚犚ofthesethreespeciesfinerootsalteredasdiameter,犛犚犔andtissuenitrogenconcentrationchanged,
whichexplainedthevariationwith64.7%,87.6%and67.6%of犛犚犚,respectively.Theseresultssug
gestedthattherewasacloselinkamongmorphologicalcharacteristicsoffineroots,thechemicalcontents
andphysiologicalfunctions,whichprovidedanimportantbasistounderstandthestructuralandfunctional
variationofplantroots.
犓犲狔狑狅狉犱狊:fineroot;rootmorphological;rootrespiration;heterogeneity;lowefficiencyforest
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s-1)׃‚çè(m2)/uv1ó(g)×10-3。Ⅰ‡
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Thedifferentnormalletterswithinthesametreespecies
indicatesignificantdifferenceamongrootorders;
Thesameasbelow
Fig.1 Thediameter,rootlengthandspecificroot
lengthofthefirstfiverootbranchordersfor
thethreetreespecies
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Table1 Theeffectoftreespecies,rootorder,theinteractionbetweentreespeciesandrootorderonthemorphologyand
nutrientandspecificrootrespiration
É¡Œ›
Sourceofvariation
¯Î™
犱犳
ύÐProbabilityvalue(P)
§¨
Rootdiameter

Rootlength
¶v©
犛犚犔
C˜™
Carbon
concentration
N˜™
Nitrogen
concentration
¶vŠ‹
犛犚犚
¹pTreespecies 2 0.012 <0.001 <0.001 <0.001 <0.001 <0.001
¹pׯ‡Treespecies×rootorder 8 0.048 <0.001 <0.001 <0.001 <0.001 0.003
¯‡
Rootorder
rh犆.狊犲狆狋犲狀狋狉犻狅狀犪犾犲 4 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
st犜.狊犻狀犲狀狊犻狊 4 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
gh犆.犳狌狀犲犫狉犻狊 4 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
51015o            78,,1:5cdef3¾¹pquv‘LIŸ ¡¢£•È
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Fig.2 TheroottissueCandNconcentrationsofthefirstfiverootbranchordersforthethreetreespecies
¶3 3p¹pp5‡uvq¶vŠ‹
Fig.3 Specificrootrespirationofthefirstfiverootbranchordersforthethreetreespecies
¶4 ¶vŠ‹š§¨、¶v©、N˜™qœÞ
Fig.4 Relationshipbetweenfinerootdiameter,specificrootlength,Nconcentrationandspecificrootrespiration
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st
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v§¨ Rootdiameter 犉st=5.769D-0.599 0.682 <0.001
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gh
犆狌狆狉犲狊狊狌狊犳狌狀犲犫狉犻狊
v§¨ Rootdiameter 犉gh=3.151D-0.798 0.874 <0.001
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·˜™ Nitrogenconcentration 犉gh=0.857N-1.632 0.811 <0.001
3¹p
Threetreespecies
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¶v©Specificrootlength 犉=1.445SRL0.589 0.876 <0.001
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