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,2016,36(6):1199-1205
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犚犲狊狆狅狀狊犲狊狅犳犎狔犱狉犪狌犾犻犮犜狉犪狀狊狆狅狉狋犈犳犳犻犮犻犲狀犮狔犪狀犱犛犪犳犲狋狔狅犳
犆狌狉狉犲狀狋狔犲犪狉犛狋犲犿狊犻狀犘犻狀狌狊狋犪犫狌犾犪犲犳狅狉犿犻狊犛犲犲犱犾犻狀犵狊
狋狅犖狌狋狉犻犲狀狋犃犱犱犻狋犻狅狀犪狀犱犐狉狉犻犵犪狋犻狅狀
HUANGShaolin1,LIYangyang2,3
(1ColegeofForestry,NorthwestA&FUniversity,Yangling,Shaanxi712100,China;2InstituteofSoilandWaterConserva
tion,NorthwestA&FUniversity,Yangling,Shaanxi712100,China;3StateKeyLaboratoryofSoilErosionandDrylandFarm
ingontheLoessPlateau,InstituteofSoilandWaterConservation,ChineseAcademyofSciencesandMinistryofWaterRe
sources,Yangling,Shaanxi712100,China)
犃犫狊狋狉犪犮狋:Theresponsesofhydraulictransportefficiencyandsafetytonutrientsandwateradditionarethe
foundationforprobingthemechanismsofextensiveacclimationin犘犻狀狌狊狋犪犫狌犾犪犲犳狅狉犿犻狊.Usingthenewly
developedcentrifugemethodandtakingthreetreatmentsascontrol(CK,nofertilization,naturalprecipi
tation),NandPaddition(F,fertilizerswereappliedwiththeapplicationrateas120kg/hm2pureNand
60kg/hm2purePperyear,naturalprecipitation),NandPadditionplusirrigation(FI,fertilizerswere
appliedwiththeapplicationrateas120kg/hm2pureNand60kg/hm2purePperyear,100mmwaterwas
irrigatedexcludinglocalprecipitation),westudiedtheresponsesoftransportefficiencyandvulnerabilityto
embolismofcurrentyearstemsinChinesepineseedlingstonutrientsandwateraddition.Theresultsindi
catedthat:(1)NandPadditionraisedbasaldiameter,canopysizeandabovegroundbiomass,buthadno
effectonspecifichydraulicconductivity(犓s),leafspecificconductivity(犔犛犆),Hubervalue,embolism
resistance(P50)andsafetymargincomparingtothecontrol.(2)ConcurrentadditionofN,Pandwaterin
creasedplantheight,basaldiameter,canopysizeandabovegroundbiomass,nodifferencebetweentreat
mentswasfoundfor犓s,犔犛犆andHubervalue,butP50ofFItreatmentincreasedby0.2MPaandsafety
marginalsonarrowed.Theseresultssuggestthatnutrientadditionhadnoobviouseffectontransporteffi
ciencyandsafety;wateradditiondidnotaffecttransportefficiencybutincreasedthevulnerabilitytoem
bolism.ThereasonwasmainlyrelatedwithlongertracheidlengthandlowerimplosionresistanceinFItreatment.
犓犲狔狑狅狉犱狊:犘犻狀狌狊狋犪犫狌犾犪犲犳狅狉犿犻狊seedlings;nutrientsandwateraddition;transportefficiency;vulnerability
toembolism
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Table1 ThegrowthstatusofChinesepineseedlingswithnutrientadditionandirrigation
¨?
Treatment ÅZ Height
/cm aµBasaldiameter/cm ¶·Canopysize/cm
a¸Yí8$¹
Abovegroundbiomass/g
CK 63.83±6.53b 1.90±0.07c 35.75±2.13c 172.34±29.30c
F 70.33±7.25b 2.20±0.04b 45.58±2.85b 234.65±30.00b
FI 85.63±6.31a 2.64±0.06a 63.42±3.12a 345.33±23.63a
t
:CKt,Fu>vw¨?,FIu>=>£¤vw¨?;£uv°|¨?!20.05= c0ÆÇ。Ü£
CKisthecontrol,FisNandPadditiontreatment,FIisNandPadditionplusirrigationtreatment(n=9);Differentlettersindicatedsig
nificantdifferencebetweentreatmentsat0.05level;Thesameasbelow
f1 jk3§¨?C³»=o、³¼»=op Huber½(n=9)
Fig.1 Thespecifichydraulicconductivity,leafspecificconductivityandHubervalueforthreetreatments
ofChinesepineseedlings(n=9)
2021 ! " # $ % & 36Á
f2 £¨?CwÙ¬s
Fig.2 Thetypicalvulnerabilitycurvesfor
differenttreatments
2 noApqG}
Table2 ThemodeledWeibulfunctionparametersof
vulnerabilitycurvesfordifferenttreatments
¨? Treatment 犫/MPa 犮
CK 2.93±0.06a 17.25±2.29
F 2.98±0.08a 15.44±1.71
FI 2.74±0.05b 17.44±1.01
f3 nL$% Weibul#_Ï(CP12、P50pP88
Fig.3 ThecalculatedP12,P50andP88ofdifferent
treatmentsbasedonmodeledWeibulfunction
>&0.30、0.33p0.26MPa,P50-P88>&0.22、
0.24p0.18MPa,°±jk;n»/µ¶op
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Table3 TheanatomicalstructureofstemsinChinesepineseedlingswithdifferenttreatments
®póP×
Anatomicaltraitsandwooddensity CK F FI
ÔÕàµTracheiddiameter/μm 13.92±0.93 13.1±0.23 14.94±0.66
ÔÕP×Tracheiddensity/(No·mm-2) 1961±175 2317±223 1896±111
ÔÕBª¦<=BªC³FTracheidareaproportion/% 25.77±6.58 31.42±2.08 33.03±1.80
=ÁൠHydraulicweighteddiameter/μm 17.61±1.31 15.73±0.64 17.27±0.68
ÔÕØ¿ÙÚÛÁImplosionresistance(狋/犫1)h2 0.23±0.04a 0.21±0.03a 0.16±0.03b
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