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,2016,36(6):1190-1198
犃犮狋犪犅狅狋.犅狅狉犲犪犾.犗犮犮犻犱犲狀狋.犛犻狀.
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犈犳犳犲犮狋狅犳犠犪狋犲狉犆狅狀犱犻狋犻狅狀狊狅狀犆犪狉犫狅狀犐狊狅狋狅狆犲犆狅犿狆狅狊犻狋犻狅狀,犘犺狅狋狅狊狔狀狋犺犲狊犻狊
犪狀犱犅狉犪狀犮犺犌狉狅狑狋犺狅犳犚犲犪狌犿狌狉犻犪狊狅狅狀犵狅狉犻犮犪
PANJia,LIRong,HUXiaowen
(ColegeofPastoralAgricultureScienceandTechnology,Lanzhouuniversity,StateKeyLaboratoryofGrasslandAgroecosys
tems,Lanzhou730020,China)
犃犫狊狋狉犪犮狋:Presentstudydeterminedtheeffectofsoilmoistureconditiononleafcarbonisotopecomposition
(δ13C),photosynthesisandcurrentyearbranchgrowthof犚犲犪狌犿狌狉犻犪狊狅狅狀犵狅狉犻犮犪inthepotexperiment.
Thebranchgrowthandδ13Cof犚.狊狅狅狀犵狅狉犻犮犪growingindifferentdegradedareawereinvestigated,and
theirrelationshipwithsoilmoisturecontentthatplantstandwereanalyzed.Theresultsshowedthat:(1)
Thecurrentyearbranchbiomass(DM),lengthoffirstgradebranches(LFG),numberofsecondgrade
branches(NSG),netphotosynthesisrate(犘n),stomatalconductance(犌s)andtranspirationrate(犜狉)of
犚.狊狅狅狀犵狅狉犻犮犪werelargelyreducedaswatersuppliesdecreasedinthepotexperiments.δ13Candwateruse
efficiency(WUE)increasedaswatersuppliesreduced,andasignificantnegativecorrelationwasobserved
betweenδ13CandDM,LFG,NSG,犘n,犌sand犜狉.(2)Inthefield,δ13Cdecreasedfromlightdegradedsites
toseveredegradedoneandsignificantlynegativelycorrelatedwithsoilwatercontentatadepthof30-60
cmand60-100cm.Anegativerelationshipwasalsoobservedbetweenδ13Candbiomassperunitcanopy
area(BCA)andnumberoffirstgradebranchperunitcanopyarea(NCA).Theseresultssuggestedthat
δ13Cisagoodindicatorof犚.狊狅狅狀犵狅狉犻犮犪responsetowaterstressbothunderpottedandfieldconditions
and犚.狊狅狅狀犵狅狉犻犮犪mainlyutilizewaterindeepersoilandutilizewatermoreefficientlyinlightdegradedar
eathanthatinseveredegradedarea.Thisconclusionmayimproveunderstandingwaterusestrategiesof
犚.狊狅狅狀犵狅狉犻犮犪inthearidenvironments,andhavepracticaluseingrasslandmanagementandrestoration.
犓犲狔狑狅狉犱狊:犚犲犪狌犿狌狉犻犪狊狅狅狀犵狅狉犻犮犪;carbonisotopecomposition;droughtstress;photosynthesis;wateruse
efficiency
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Table1 Effectofdroughtstressonplantheightandcurrentyearbranchgrowthtraitsof犚.狊狅狅狀犵狅狉犻犮犪
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Numberofsecond
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Lengthofsecond
gradebranches
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W4 18.9±2.1a 20.36±1.30a 46±9.3a 24.6±1.14a 143±63.1a 3.5±0.22a
W8 18.9±1.5a 17.36±1.18b 54±1.8a 24.6±2.86a 89±30.0b 2.8±0.17b
W12 19.2±2.1a 16.08±1.12b 49±14.5a 19.5±0.70b 83±43.2b 3.0±0.17b
W16 15.5±1.2b 8.31±0.76c 50±19.5a 15.7±2.36c 29±18.6c 3.6±0.61a
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Table2 Carbonisotopecompositionandgrowthtraitsof犚.狊狅狅狀犵狅狉犻犮犪inincreasinglydegradedgrasslands
CÅÌ
Indicatorofplantgrowth
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Lightdegraded
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Moderatedegraded
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Severedegraded
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iÒPlantheight/cm 32.0±1.06a 22.2±1.35b 16.0±1.48c
¾¿ÀÁCanopyarea/cm 3453±347.3a 3113±317.6a 1733±223.5b
oC$Currentyearbranchbiomass/g 37.6±1.62a 36.9±1.70a 36.6±2.20a
o¡ Numberoffirstgradebranch 2325±59.9a 1796±153.6b 846±63.0c
oLengthoffirstgradebranch/cm 3.0±0.07b 3.3±0.09b 5.0±0.39a
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Table3 Effectofdroughtstressonphotosynthesisrate(犘n),transpirationrate(犜狉),wateruseefficiency(WUE),
stomatalconductance(犌s)andδ13Cof犚.狊狅狅狀犵狅狉犻犮犪branch
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W4 2.57±0.26a 2.34±0.27a 0.30±0.061a 1.17±0.21c -27.37±0.24c
W8 2.17±0.13b 0.86±0.07b 0.11±0.010b 1.93±0.13b -26.36±0.19b
W12 1.26±0.09c 0.50±0.03c 0.06±0.004c 2.52±0.16a -24.54±0.21a
W16 0.63±0.09d 0.52±0.06c 0.05±0.004c 1.22±0.09c -24.76±0.24a
{
:
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Table4 Therelationshipsbetweenmorphologicalandphysiologicaltraitsof犚.狊狅狅狀犵狅狉犻犮犪under
droughtstressinthepotexperiments
ÅÌ
Index δ
13C/‰
WUE
/(μmol·
mmol-1)
犘n
/(μmol·m-2
·s-1)
犜r
/(mmol·m-2
·s-1)
犌s
/(mol·m-2
·s-1)
DM/g NFG NSG LFG/cm
WUE 0.505
犘狀 -0.779 -0.060
犜狉 -0.844 -0.516 0.835
犌狊 -0.815 -0.460 0.849 0.991
DM -0.662 0.153 0.843 0.632 0.650
NFG -0.037 0.418 0.042 -0.232 -0.232 0.166
NSG -0.544 0.018 0.517 0.421 0.392 0.727 -0.057
LFG -0.496 0.010 0.441 0.383 0.381 0.486 0.118 0.558
LSG -0.040 -0.216 0.035 0.088 0.076 -0.163 -0.447 -0.149 -0.201
{
:δ13Cuvmwxyz;WUE.no¯°±¥;犘n.£{|¤¥;犜r.¨©¤¥;犌s.¦§U;DM.oC$;NFG~LFGoÿ
Æo¡:~o
;NSG~LSGoÿÆ o¡:~ o.~oÿÆ0.05~0.01n»«¬,¸9
9_
;
jm
Note:δ13C.Carbonisotopecomposition;WUE.Wateruseefficiency;犘n.Netphotosynthesis;犜r.Transpirationrate;犌s.Stomatalcon
ductance;DM.Currentyearbranchbiomass;NFGandLFG.Numberandlengthoffirstgradebranch,respectively;NSGandLSG.Number
andlengthofsecondgradebranch,respectively.andindicatesignificantcorrelatedat0.05and0.01level,respectively.Thesameasbelow
5 JKFG、δ13犆Hijk4lLQG(ab[\)
Table5 Therelationshipsamongplantgrowthtraits,carbonisotopecomposition(δ13C)andsoilwatercontentinthefield
ÅÌ
Index δ
13C/‰ Swc30/% Swc60/% Swc100/% PH/cm CA/cm2 DM/g NFG LFG/cm NCA
/
(No·dm-2)
Swc30 0.145
Swc60 -0.552 -0.430
Swc100 -0.548 -0.664 0.896
PH/cm 0.219 0.612 -0.634 -0.786
CA/cm2 0.679 0.141 -0.417 -0.439 0.486
DM/g -0.124 0.031 0.102 0.036 0.184 0.092
NFG 0.122 0.580 -0.498 -0.714 0.875 0.434 0.243
LFG/cm 0.004 -0.451 0.370 0.525 -0.633 -0.300 0.214 -0.808
NCA/(No·dm-2) -0.544 0.324 -0.164 -0.257 0.352 -0.543 -0.058 0.407 -0.450
BCA -0.725 -0.227 0.289 0.698 -0.357 -0.872 -0.101 -0.413 0.257 0.586
{
:Swc30、Swc60、Swc100oÿÆ0~30、40~60、70~100cm¼Ín;PH.iÒ;CA.¾¿ÀÁ;NCA~BCAoÿƽwÀÁ¾¿¡
~¾¿C$
Note:Swc30,Swc60,Swc100standforsoilwatercontentatdepth0-30,40-60,70-100cm,respectively;PH.Plantheight;CA.Canopyarea;NCAand
BCAstandfornumberandbiomassofbranchperunitcanopyarea,respectively
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