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Ecosystem Carbon Density of Grasslands under Different Grazing Exclusion Ages in Semiarid Region of the Loess Plateau

黄土高原半干旱区不同封育年限草地生态系统碳密度



全 文 :!24" !1#
 Vol.24  No.1
! " # $
ACTA AGRESTIA SINICA
   2016$  1%
  Jan.  2016
犱狅犻:10.11733/j.issn.10070435.2016.01.004
äš{Ðåæ\c~çèbéŒ/()*êë€
d %1,2,e f3,HG51,4,U g5,h i6,j k1
(1.‹:(¢*¾Y+!K*¾+,,‹ ƒ‘712100;2.­¢ž()*+,,­¢ Ÿö130124;
3.·ù(’§”ÃcÒ,·ù “”750002;4.&*+,QÏúQÙУ/01,‹ ƒ‘712100;
5.&*+,¤:_ù()9\/01,­¢ Ÿö130102;6.¬¢)b&Z¢)a¿£³²²,,˜Z Ÿ+410014)
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:20141020;LMJK:20150526
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(1985),È,z:ЩÉ,ÊË,Åù/0¯,Email:gaoyang2302@126.com;<Ôc™ Authorforcorrespondence,E
mail:gyzcjm@ms.iswc.ac.cn
78

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=•¡6@PJ$AŸ—-
(犛狋犻狆犪犫狌狀犵犲犪狀犪)-_
9\]^g†A|‘˜%=–£)

Ì«ef~œ

>?6PJ5$、9$、15$、22$、25$、30$T-_9\]
^g†A<ð<=n212.72~350.42MgC·hm-2,‘&,PJ30$-_Ýs,>?-_݀,ò…†€éÜPJ
-_
(犘<0.05)。-_J/g†AjPJ15$Ýs,Wd15.65MgC·hm-2,>?-_݀,7n7.82MgC·
hm-2。L˜%=–S,}]g†A1ØR©¸áWd82.56%。-_ÙCg†AL204.90~337.36MgC·hm-2
ã%<ð

ÀPJ$ATÁŸ£„íî

PJ-_ÙCg†AÚ>??-_T2.33~2.64±。jSefgh,P
JL…†›swÙs.ˆš‰Ž-_9\]^g†A

I=Ÿ2%TPJ™š-_TóÂ6êgN¥°›

šù
Ïd’§[\-_9\]^£„²³°±

9:;

PJ

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ÙCZ•
<=>?@
:S812.5    ABCDE:A     AFG@:10070435(2016)01002807
犈犮狅狊狔狊狋犲犿犆犪狉犫狅狀犇犲狀狊犻狋狔狅犳犌狉犪狊狊犾犪狀犱狊狌狀犱犲狉犇犻犳犳犲狉犲狀狋犌狉犪狕犻狀犵
犈狓犮犾狌狊犻狅狀犃犵犲狊犻狀犛犲犿犻犪狉犻犱犚犲犵犻狅狀狅犳狋犺犲犔狅犲狊狊犘犾犪狋犲犪狌
GAOYang1,2,MAHu3,CHENGJimin1,4,ANYu5,LIU Wei6,CHENAo1
(1.ColegeofAnimalScienceandTechnology,NorthwestA&FUniversity,Yangling,ShaanxiProvince712100,China;2.JilinAcademy
ofAgriculturalSciences,Changchun,JilinProvince130124,China;3.NingxiaRuralEnergyWorkstation,Yinchuan,NingxiaProvince
150002,China;4.InstituteofSoilandWaterConservation,ChineseAcademyofSciences/MinistryofWaterResources,Yangling,Shaanxi
Province712100,China;5.NortheastInstituteofGeographyandAgroecology,ChineseAcademyofSciences,Changchun,JilinProvince130102,
China;6.CentralSouthForestInventoryandPlanningInstituteofStateForestryAdministration,Changsha,HunanProvince410014,China)
犃犫狊狋狉犪犮狋:Inthisstudy,grazinggrasslandandgrasslandswithdifferentexclusionages(5,9,15,22,25
and30years)of犛狋犻狆犪犫狌狀犵犲犪狀犪atYunwuMountainNationalNatureReservewereselectedtoanalyzee
cosystemcarbondensitiesandtheirdistributionamongdiscretepools.Grasslandecosystemcarbondensi
tiesrangedbetween212.72MgC·hm-2and350.42MgC·hm-2,thehighestingrasslandwith30year
exclusionandthelowestingrazinggrassland,whichwassignificantlylowerthanthatofexclusiongrass
lands(犘 <0.05).Grasslandwith15yearexclusionhadthehighestvegetationcarbondensity,15.65Mg
C·hm-2,however,grazinggrasslandhadthelowest,7.82MgC·hm-2.Inaddition,theaveragepro
portionofrootcarbondensitywas82.56%.Soilcarbondensitiesincreasedwithincreasingexclusionages,
rangedfrom204.90MgC·hm-2to337.36MgC·hm-2,andexclusiongrasslandswere2.33~2.64
timesgreaterthanthatofgrazinggrassland.Theseresultsshowedthatexclusionsignificantlyincreasede
cosystemcarbondensityofgrasslandinsemiaridregionoftheLoessPlateau,however,long-termexclu
sionwouldexertnegativeinfluencesongrasslandrenewalandcarbonsequestrationpotential,andreasona
bleutilizationsweresuggested.
犓犲狔狑狅狉犱狊:Exclusion;Biomass;Carbonconcentration;Soilbulkdensity
!1# s d?:wÙs.ˆš‰Ž6@PJ$A-_9\]^g†A
  wÙs.Úð÷SÝYTwÙ¯&Ž,cÓÖn
62.68ukm2,‘&-_ÓÖØcÓÖT1/3[12]。á
·-_ڕ«T9K“”

ÚwÙs._Žê?)°
±T®¯

L¢£Š‹

УQÙ?ÒÓÞJœYT
9\¼M
[34]。
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èéÉnÉ!6Š‹<ð
?UV

á·-_9\]^‡Ó"ì6@ÄATï
ð

ÀÖM69\¼¦§žŸœ
[5]。
)*6•
ïðTá·-_’n R”gT„þ

PJÚ-_J/)*²&ÝÀÖnJ:T¡
äãß

AÚ-.9\ ùTÐÕ

Dïð-_TJ
/)*9¤¥›sJ…†:f
[67]。
ë/0™
4nPJíî¡J/9K`

€¡ÙCgTnO
ØÝ

\n›s-_g†A
[8]。
·nèéHlÍÖ
6)*2%Tغ

‰éPJD-_g†ATUV
¢ökO^ßey
[910]。
»/0j©–ج9¶·ÐюEF-.n
/0DR

<==•6@PJ$AŸ—--_J/
g†A6ÙCg†AT<ð£)

WXPJ¡äD
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j#nwÙs._
Ž-_“”T²6¼°Ïd›œž^

1 UVXY
1.1 Z[\^_
©–ج9¶·ÐюŸé·ù_Žê.¦
¤:ú

_ù£FE106°21′~106°27′,N36°10′~
36°17′,ª«1800~2148m。YŽŠ‹¬EFYÜ
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š(ƒs

°°–]

%¤Ÿ¥&

ù
%¦pC§

$R©ŠÛ7℃,$R©s`400~
450mm,‘&7-9%Vs`Øà$s`T
65%~75%,$R©°°`1330~1640mm,ï
#112-140d,≥10℃ÖÛ2100~3200℃。Ðю
cÓÖn6660hm2,‘&¨!ŽÓÖ1000hm2,Œ
 ŽÓÖ1300hm2,BCŽÓÖ4360hm2。YŽÙ
CàFnwÙÇFS°JT›©Ù6Ø_3ªÙ

ْ=>©Q‚2

JKOPjŸ—-
(犛狋犻狆犪
犫狌狀犵犲犪狀犪)、YZ[(犛.犵狉犪狀犱犻狊)、«e¬(犜犺狔犿狌狊
犿狅狀犵狅犾犻犮狌狊)、­®â(犃狉狋犲犿犻狊犻犪狏犲狊狋犻狋犪)?nÌ,5
9KGJ¯Êâ
(犃.狊犮狅狆犪狉犻狊)、°-(犔犲狔犿狌狊狊犲犮犪
犾犻狀狌狊)、/ʱ²æ(犘狅狋犲狀狋犻犾犾犪犪犮犪狌犾犻狊)?[11]。
1.2 jkXY
1.2.1 lmMEbc é2012$8%,(©–
ØÐю2PJ5,9,15,22,25630$TŸ—-O
PEF+ÓnPJ-_:­

:­³{=¾n
GE5,GE9,GE15,GE22,GE256GE30),Æjúä
T>?–An8v÷Ÿ·º´-1·$-1T-_nD
Ò

:­³{GG),=¾L¿M:­²Â3Å50m
×50mT:_,¿Å:_ÀÁ²Â5M1m×1m
T:Ò

Ð:Ò21JJK_Sú=Ç_ÈÉ

ã_
_¯:Ò2TµPK

=¾S‘¼•
,65±5℃ÌÍ
Ε

Ð_Sú=6µPK_—_

LSð:Ò2
f25cm×25cmTÓÖ¶f100cmTÙ,=
0~20cm,20~40cm,40~60cm,60~80cm680
~100cm·’f:,=¾¸Q,d¹Qº»、 ¼、
=L

½O}]

Ž=É}

¾}

К_S`¼•

65±5℃œÌšÍΕ。
1.2.2 @AnBEbc LÜ:_2(öcÉn
š›Tog_,

¶f1M100cm‚TÙC¿Ó,
20~20cm,20~40cm,40~60cm,60~80cm680
~100cm=’。dHÀԯܒÙC,¿’•*ñ
“

¾eéHÀ+ÙCT¼•,ÜÊ^CËéH
À+ÙCTš•j|HÀT•`,²ßÙCZ•。
1.2.3 omp@A]:qrstLMbc ¾e
Ô¯T_Sú=

µPKj|}]?JK:1̚
_

ÁJ

=100µL,@ß:_2ˆ@J/ä=?
šnY:_TJK=•:1

L¿Å:_Ta¿:
Ò2d2Â5cm TÙ9,20~20cm,20~40
cm,40~60cm,60~80cm680~100cm=’,¿
’•*3“。@ß:_2@’“Ù:?š_ËkY
’ÙCT=•:1

¾eÔ¯TÙC:1

Ãõb
ƒN6Â9N

К

ÁJ

=100µL,?š©QÄ
d

Ôd‡Elementüu=•TéJK6ÙC
:1Tg»`

1.3 lmnoW*µ>r
ܘ’g†A²ßºâ~œ

犆犇犃犌犅=犃犌犅×犆犃犌犅×10-5 (1)
犆犇犅犌犅=犅犌犅×犆犅犌犅×10-5 (2)
犆犇犔犉=犔犉犅×犆犔犉犅×10-5 (3)
犞犆犇=犆犇犃犌犅+犆犇犅犌犅+犆犇犔犉 (4)
犛犆犇犻=犛犆犻×犅犻×犇犻×10-1 (5)
犛犆犇=∑犛犆犇犻 (6)
犜犆犇=犞犆犇+犛犆犇 (7)
â&
,犆犇犃犌犅,犆犇犅犌犅,犆犇犔犉=¾n_Sú=、}]
6µPK’Tg†A
(mgC·hm-2),犃犌犅,犅犌犅,
犔犉犅=¾n‘DŠT9K`(g·m-2),犆犃犌犅,犆犃犌犅,
犆犃犌犅=¾n‘DŠTg»`(g·kg-1);犞犆犇 nWN
92
! " # $ !24"
J/g†A
(mgC·hm-2);犛犆犇犻n!犻’ÙCg†
A
(g·kg-1),犛犆犻n!犻’ÙCg»`(g·kg-1),犅犻
n!犻’ÙCZ•(g·cm-3),犇犻 n!犻’Ù’2A
(cm),犛犆犇WNÙCg†A(mgC·hm-2),犜犆犇-
_9\]^g†A
(mgC·hm-2)。
ëÏ^²=•dSPSS16.0ÕÖ6DPSëÏ
Óù]^

Ü:­%T9K`

ÙCZ•

J/6Ù
Cg»`

J/g†A

ÙCg†A69\]^g†
AT¸tÔd÷5uÒØ=•

•¸tÔdÂ*ú
Ø
(SSR)â;nh"J/_Sú=、_œú=6µP
Kg»`Lä=%6PJ$A%Tغ

DÜ-_:
­%6@J/ä=g»`\‘Y5uÒØ=•

@
2

D9\]^g†AJ/g†A6ÙCg†Aã
%T‰]\‘ˆ‰=•

ˆ‰]ëÔdPearson。
2 pq>r
2.1 +,,1
@>?-_
(GG)ˆ¸,ÜPJ$Aœ-__S
ú=9K`©kd…†›s
(犘<0.05)。PJ5,9,
15,22,25,30$T-__Sú=9K`=¾n226.04
g·m-2,324.23g·m-2,424.12g·m-2,491.53g·
m-2,475.68g·m-26446.67g·m-2,t>?-_
(GG)›s¡90.48%~314.21%。-__Sú=9
K`T<ðóIgPnPJv#6ÿíî

ÆLPJ
22$-_(GE22)WdÝs,À__LPJ15-30$#%ó騩。
PJ15$-_(GE15)T}]9K`ÝY,n
3307.94g·m-2,…†sé‘XPJ$A(犘<
0.05);‘“nPJ22$-_(GE22),}]9K`
n3079.67g·m-2;ÜPJ-_:­jPJ5$-
_
(GE5)}]9K`݀,n2248.31g·m-2,I
YE…†sé>?-_:­
(GG)T}]9K`
(犘<0.05)。Ü:­É}9K`¾}9K`¸á
n2.92~4.84(ë1),É}9K`L1529.38~
2736.01g·m-2ã%<ð,YuklnPJ15$
-_
(GE15)>PJ22$-_(GE22)>PJ25$
-_
(GE25)、PJ9$-_(GE9)>PJ30$-
_
(GE30)>PJ5$-_(GE5)>>?-_(GG)
(犘<0.05)。¾}9K`(jPJ 30 $-_
(GE30)Ýs,n706.10g·m-2,>?-_(GG)Ý
€

7n315.99g·m-2。Sðefgh>?-_
J/}]T9Ÿ6¹Ú©P_éPJ-_

}]T
=’=>…˜0~20cm、20~40cm、40~60cm、60
~80cm680~100cm’}]9K`=¾Øc`
T66.33%,21.04%,7.74%,3.96%60.93%,g
hg’ÙC}]=>ݍ

=1 c~çèbéŒ/ì),1
Fig.1 Rootbiomassofgrasslandswith
differentgrazingexclusionages
ü
:GGn>?-_,GE5nPJ5$-_,
GE9nPJ9$-_,GE15nPJ15$-_,
GE22nPJ22$-_,GE25nPJ25$-_,
GE30nPJ30$-_;ë&6@uU;Çg˜
:­%غ…†
(犘<0.05),œ@
Note:GGisgrazinggrassland,GE5isgrassland
ofgrazingexclusionfor5years,GE9isgrassland
ofgrazingexclusionfor9years,GE15isgrassland
ofgrazingexclusionfor15years,GE22isgrassland
ofgrazingexclusionfor22years,GE25isgrassland
ofgrazingexclusionfor25years,GE30isgrassland
ofgrazingexclusionfor30years.Differentlowercase
lettersindicatesignificantdifferencesamonggrassland
sitesatthe0.05level,thesameasbelow
  ÜPJá·-_µPK9K`©…†sé>?
_
(犘<0.05),òÀPJ2%TÁŸn6ÿíî,LP
J25$Wd¶,À_$
、22$、25$、30$T-_µPK9K`©=¾
n78.89g·m-2,122.79g·m-2,255.04g·m-2,
268.39g·m-2,303.78g·m-26289.15g·m-2,Ú
>?-_
(GG)µPK9K`T3.79~13.88±。
2.2 +íêë€
Üá·-__Sú=g»`©<ð<=n
434.90~480.10g·kg-1,R ©  n 456.40
g·kg-1,}]g»`<ð<=n346.90~391.70
g·kg-1,R©n372.80g·kg-1,µPKg»`
<ð<=n281.20~353.90g·kg-1,R©n
319.30g·kg-1。Y5uÒØ=•ef…˜,PJ
$ADJ/g»`TÌN:Š6…†

nJ/ä=
TÌN:ŠWd…†QR
(犘<0.05),á·-__
03
!1# s d?:wÙs.ˆš‰Ž6@PJ$A-_9\]^g†A
Sú=g»`…†sé}]6µPKTg»`
(犘
<0.05)。
6@PJ$Aá·-_J/g†A©L7.82
~15.65MgC·hm-2ã%<ð(g1),‘Yukl
n

PJ 15 $-_ (GE15)> PJ 22 $-_
(GE22)、PJ25$-_(GE25)、PJ30$-_
(GE30)、PJ9$-_(GE9)>PJ5$-_
(GE5)>>?-_(GG)(犘<0.05)。
`1 c~çèbéîïŒ/+íêë€
Table1 Vegetationcarbondensitiesofgrasslandswithdifferentgrazingexclusionages
:­³{
SiteNo.
g†ACarbondensity/MgC·hm-2
_Sú=
Aboveground
}]
Root
µPK
Litter
c
Total
GG  0.53±0.10d 7.23±0.16d 0.07±0.01e 7.82±0.09d
GE5  1.04±0.15c 8.52±0.59c 0.26±0.04d 9.82±0.42c
GE9  1.41±0.06b 10.94±0.77b 0.43±0.03c 12.78±0.81b
GE15 2.03±0.07a 12.90±1.27a 0.72±0.11b 15.65±1.33a
GE22 2.30±0.28a 10.89±0.86b 0.79±0.03b 13.97±1.06b
GE25 2.17±0.03a 9.98±0.28b 0.99±0.07a 13.14±0.32b
GE30 2.02±0.17a 10.07±0.15b 0.97±0.08a 13.06±0.23b
  ü:g&@j6@uU;Çg˜:­%غ…†(犘<0.05),œ@
Note:Differentlowercaseswithinthesamecolumnindicatesignificantdifferencesamonggrasslandsitesatthe0.05level,thesameasbe
low
  _Sú=、}]6µPKg†A=¾Ø-_J/
g†AT12.86%,82.56%64.58%,gh}]Ú-
_J/g†Aݕ«Tä’ú=

‘&

PJ22$
-_
(GE22)_Sú=g†AÝs,>?-_(GG)Ý
€

Üá·-_}]g†A©<ð<=n7.23~
12.90MgC·hm-2,LÜá·-_:­%T<ð£
)cTJ/g†AT<ð£)ß#

Üá·-_
:­TµPKg†A©Tغ̫fgéµPK
9K`

PJ25$-_(GE25)TµPKg†AÝ
s

W0.99MgC·hm-2,…†sé‘X-_(犘<
0.05);>?-_(GG)TµPKg†A݀,7n
1.38MgC·hm-2,…†€éÜPJ-_(犘<0.05)。
2.3 š›ßœ
ÀPJ2%ÁŸ

ܒÙCZ•6q€

g2),ghPJ¡ä…†;Å¡ÙCTÆ^
A

èS͜

>?-_
(GG)ܒÙCZ•©
УtsQR

ò20~40cm 640~60cm Ù
’TÙCZ•©Wd1.40g·cm-3,…†sé
ÜPJ-_
(犘<0.05)。PJ_#,ËPJ22
$
、25$630$-_TܒÙCZ•©…†
ێ>?-_
(犘<0.05)。Üá·-_TÙC
Z•©gPÀْî‚níîT<ð£)
,80
~100cm’TÙCZ•t0~20cm’R©›
s¡0.17g·cm-3。
`2 c~çèbéŒ/š›ßœ
Table2 Soilbulkdensitiesofgrasslandswithdifferentgrazingexclusionages
:­³{
SiteNo.
ÙCZ•Soilbulkdensity/g·cm-3
0~20cm 20~40cm 40~60cm 60~80cm 80~100cm
GG  1.23±0.00a 1.37±0.01a 1.40±0.02a 1.38±0.04a 1.40±0.03a
GE5  1.20±0.02ab 1.31±0.01b 1.37±0.01b 1.39±0.02a 1.43±0.00a
GE9  1.21±0.01a 1.26±0.01c 1.29±0.01d 1.35±0.02a 1.40±0.02a
GE15 1.23±0.01a 1.27±0.01c 1.24±0.01c 1.31±0.00b 1.36±0.02b
GE22 1.18±0.01bc 1.23±0.01d 1.29±0.01c 1.31±0.02b 1.31±0.01c
GE25 1.17±0.02c 1.22±0.01d 1.24±0.00d 1.26±0.02c 1.28±0.02d
GE30 1.04±0.03d 1.09±0.02e 1.21±0.02e 1.25±0.01c 1.24±0.00e
2.4 š›êë€
ܒÙCTg»`ÀPJ2%TÁŸ6qí
î

.ßóIÙCZ•T<ð£)ˆu

ë2),g
hPJ¡ä…†›s¡ÙCTg»`

¶Snœ

>?-_
(GG)ܒÙCg»`©=¾n20.53g
·kg-1,15.56g·kg-1,13.67g·kg-1,13.84
g·kg-1612.62g·kg-1,õ60~80cmْe,
‘Xܒ©…†€éPJ-_
(犘<0.05)。ܒÙ
Cg»`©jPJ30$-_(GE30)Ýs,=¾n
40.72g·kg-1,33.12g·kg-1,26.82g·kg-1,
24.39g·kg-1622.33g·kg-1。Üá·-_TÙ
Cg»`©gPÀْî‚n€T£)
,80~100
13
! " # $ !24"
cmÙCg»`¸0~20cm’ÙCg»`€¡
7.92~8.39g·kg-1,‘&,20~40cmْìÝ
Y

t0~20cm ْg»`€¡4.60~8.72
g·kg-1。
=2 c~çèbéŒ/š›êž1
Fig.2 Soilcarbonconcentrationsofgrasslands
withdifferentgrazingexclusionages
  Üá·-_ÙCg†A©L 204.90~
337.36MgC·hm-2ã%<ð(g3),‘Yukl
n

PJ 30 $-_ (GE30)> PJ 25 $-_
(GE25)、PJ22$-_(GE22)、PJ5$-_
(GE5)>PJ9$-_(GE9)、PJ15$-_
(GE15)>>?-_(GG)(犘<0.05)。@>?-_
(GG)ˆ¸,PJ-_TÙCg†A›s¡33.01%~
64.64%。0~20cm’ÙCg†AjPJ22$-_
(GE22)Ýs,W87.84MgC·hm-2,…†séõP
J30$-_(GE30)eT‘Xá·-_:­。20cm
jœÜ’ÙCg†A©jPJ30$-_(GE30)Ý
s

ÀìْTî‚

ÙCg†A6q€

ܒR
©g † A = ¾ n 74.29 MgC·hm-2,62.27
MgC·hm-2,57.92 Mg C·hm-2,50.02 Mg
C·hm-2645.65MgC·hm-2,=¾ØWM¿ÓÙ
Cg†AT25.60%,21.46%,19.96%,17.24%6
15.73%。
2.5 ()*êë€
Üá·-_9\]^g†A©<ð<=
n212.72~350.42MgC·hm-2(ë3),>?
-_
(GG)9\]^g†A݀,…†€é6M
PJ-_
(犘<0.05)。ÜPJ-_T9\]^
g†AYukln

PJ30$-_(GE30)>
P J 25 $ - _ (GE25)> P J 22 $ - _
(GE22)>PJ5$-_(GE5)>PJ9$-
_
(GE9)>PJ15$-_(GE15)。‘&,P
J22$(GE22)PJ25$(GE25)、PJ22
$
(GE22)PJ5$(GE5),j|PJ9$
(GE9)PJ15$(GE15)T9\]^g†A
ã%Øº

IԩɠێPJ30$
-_
(GE30)。Üá·-_J/g†A©n
12.32MgC·hm-2,ÙCg†A©n290.15
MgC·hm-2,ÚJ/g†AT23.55±。èé
ÙCg†A1ظátY

‘9\]^g†
A T Y u „ … † ‡ ˆ ‰
(狉=0.999,犘<
0.001),5.Üá·-_T9\]^g†AY
uklÙCg†ATklˆQ

`3 c~çèbéŒ/š›êë€
Table3 Soilcarbondensitiesofgrasslandswithdifferentgrazingexclusionages
:­³{
SiteNo.
g†ACarbondensity/MgC·hm-2
0~20cm 20~40cm 40~60cm 60~80cm 80~100cm c Total
GG  50.43±1.66d 42.53±0.62d 38.41±0.71c 38.14±0.44d 35.40±0.36c 204.90±0.93d
GE5  72.07±2.28c 67.93±1.66b 64.68±1.85a 53.45±1.46bc 45.15±2.23b 303.29±4.11b
GE9  70.16±0.90c 61.57±2.04c 56.06±2.39b 49.94±1.03c 46.17±0.72b 283.90±3.14c
GE15 77.46±3.56bc 57.73±1.31c 57.56±3.78ab 40.22±0.95d 39.57±1.32c 272.55±5.43c
GE22 87.84±8.61a 68.14±3.51b 60.05±3.06ab 51.15±2.99c 44.98±1.81b 312.15±4.04b
GE25 77.89±5.84bc 65.95±2.70b 63.72±2.45a 56.35±2.50b 53.00±2.02a 316.91±9.25b
GE30 84.17±4.43ab 72.07±2.26a 64.94±8.47a 60.88±4.31a 55.30±1.78a 337.36±19.09a
3 ˆ‰Wp‰
  ÜPJ-_T_Sú=、}]6µPKTg†
A©…†sé>?-_

g1),ghPJ¡äL…
†›s-_J/g†A

iõ>?š›

ßÒÓ"
#‚ƒ¡5!KÔ&1+’T_S9K`TÇ!

@2hi§¥–TL&?-Të`6ÄAYì
íî

Ín[\_Sú=9K`TÖ¹
[1213];
7ßÒ
23
!1# s d?:wÙs.ˆš‰Ž6@PJ$A-_9\]^g†A
Ó

PJ<=;ÅÙCTùð‰

îØJKDD=
6Q=T^_

[\-_JK}]T9Ÿ

ÍnJ
rWNT9ŸØAî×
[1415]。
5.

Dˆš‰Žï
ð-_\‘TPJ¡ä

L[\-_JKT9Ÿ

…
I6óÂ

5>?ncš›TJKOPkd¶·
)*
[5]。
·n

Ÿ#PJÿÜçKúUV
[16],
ʪ
JKMN%hiîŸ

“”J:€

Ín)¡
-_JKT9Ÿ

…I6óÂ
[17]。
»/0&

.G
)cdÝjgPL}]ÒÓ

PJ15$-_
(GE15)}]9K`ÝY,‘_(OP€óI(ë
1)。}]9ŸcAÿ€JKDÙCQ=6D=T
^_

_Sú=T9ŸÀれ

5.

PJ22$_
-__S9K`6Uíî

.e

PJ_#-_µ
PK6ÿÖ¹

DGmh°6ÈÉ9Ÿ¤9Áˆ™
š

Ín)¡JKOPT…I6óÂ
[18]。
=3 c~çèbéŒ/()*êë€
Fig.3 Ecosystemcarbondensitiesofgrasslandswith
differentgrazingexclusionages
  PJ-_TÙCg†At>?-_›s¡
33.02%~64.65%,ghPJ-_TÙCÞJts
Têg§¥

.ÚèéPJ¡äLj…†›s-_
JKT_S6_Ϝ=9K`

\níîJKcÙ
CgTnÊ
[19]。
7e

PJ-_ÄAkd¡…†
›s

îãµPKTËÄcd

‚o¡ÐÌ6sQ 
Í+’Tg’ÙCT¹!
[20]。


PJ9Ρ¬
êD-_TÏý

ÙCÆ^A€

JK}]9Ÿ
m%kj6ÿi±

ÏéQ=TƒÐ6mŠT¹<

Ín[\güuLÙC&TûÚ
[21]。
.}cdL
PJ8#gP!nÑO

·nPJ_#

-_JKT
9K`„œóI

DÙCTgnƒ6q‚Œ

ÙC
g†AíŸØAœ
[22]。
5.

=Ÿ2%TPJu
n6ÏéÙCêgN¥T°›

»/0&

PJ5
$-_TÙCg†APJ22$、25$-_ã%
غ

L§Úf:.5+’

Ð\‘_„/
0

LÒ"=>ÒÓ

Üá·-_:­TÙCg†
A©ÀْTî‚n‚u
,0~20cmْÙCg†
AڑXْT1.16~2.16±。µPK6}]T
=”ÚÙCgTÝÌ«ç”

»/0&0~20cmÙ
’TÉ}6¾}=>ݍ

ò‘"#µPK’#
Ó

5.Y’ÙCgTç”tnëì

7e

g’Ù
CT?9K`6É¥©¸‚’ÙCs
[23],
.k}
]6µPKT=”É!–]

@2

g’ÙCT»
Q`6ÛA<ðt×

.GS!\ß[\¡}]
6µPKT¹Ú
[24]。
»/0&-_J/g†An12.32MgC·
hm-2,.ef Olson?[25]1OÃT&-_J
/g†A£R

.TO߁7.99MgC·hm-2。.ghPJ¡ä
-_9K`kd…†›s

ÙCg†AØÜá·
-_9\]^g†AT90%jS,ÚJ/g†AT
23.55±(ë3)。.ßefO=Ô©¡-_ÙCg
˜T•«
。Atjay?[27]»O,àÄ-_gh`T
89.4%Õ+LÙC&。-_ÙC&Tgüu6Ih
`œY

nòˆD¨©

î–ÙCTgÖ¦§LjJ
:Œ6àÄÛˊN×A6ÿSêTbI
[28]。
Ü
á·-_T9\]^g†A©n302.47MgC·
hm-2,sé‘X/0&DYà-_9\]^g†A
TOÃef
[29]。
.ghPJ¡äLj…†›s-
_Tg†A

[\-_9\]^TêgN¥T°›

PJL…†›swÙs.ˆš‰Ž-_9\]
^g†A

J/g†ALPJ15$2WdÝs,I
=Ÿ2%TPJ™š-_J/TóÂ

šùKAÏ
d’§[\-_9\]^£„²³°±

ÙCg†
ALPJ30$_E„íŸ\I,ghPJ-_ÞJ
ß©êgN¥

‘Ÿ#TgÖ§¥JR\ß/0

”•AB
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%&( )*+)
43