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Ci:Ca
δ13C
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−30
−28
−26
−24
0 0.2 0.4 0.6 0.8
(a)
●
●
R2 = 0.15 , p< 0.001 R2 = 0.18 , p< 0.05
δ13C
Nar
ea (g
m−2
)
●●
●
●
●
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0
2
4
6
8
−30 −28 −26 −24
(b)●
●
R2 = 0.30 , p< 0.001 R2 = 0.18 , p< 0.05
MI
δ13C
●
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−30
−28
−26
−24
0 0.2 0.4 0.6 0.8 1
(c)
●
●
R2 = 0.43 , p< 0.001 R2 = 0.47 , p< 0.001
MI
Nar
ea (g
m−2
)
●●
●
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0
2
4
6
8
0.2 0.4 0.6 0.8 1
(d) ●
●
R2 = 0.59 , p< 0.001 R2 = 0.39 , p< 0.001
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V cm
ax (µ
mol
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s−1
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0
50
100
150y = 1131xy = 487x
(a)
●
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N−fixerNon N−fixerColdHot
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gcm
Nar
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y = 15xy = 44x
(d)
gs (mol CO2 m−2 s−1)
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0.32
0.34
0.36
0.38
0.40
0.42
●
●
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●
●
●
●●
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1 2 3 4 5 6 7 8 9 10
RMSE
Node Size (X ⋅X)
0.68
0.70
0.72
0.74
0.76
0.78
0.80
●
●
●
●
●
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1 2 3 4 5 6 7 8 9 10
Correlation
Node Size (X ⋅X)
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6
8
10
12
14
16
18
20
22
24
26
28
MAT (°C)MEAN ANNUAL TEMPERATURE
500
1000
1500
2000
2500
3000
3500
4000
PPT (mm)ANNUAL TOTAL PRECIPITATION
TVSZMHIH�F]1��,YXGLMRWSR��%29 �
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500
1000
1500
2000
2500
3000
3500
4000
PPT (mm)ANNUAL TOTAL PRECIPITATION
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6
8
10
12
14
16
18
20
22
24
26
28
MAT (°C)MEAN ANNUAL TEMPERATURE
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1.6
2
2.4
2.8
3.2
g m−2LEAF NITROGEN CONCENTRATION(AREA BASED)
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500
1000
1500
2000
2500
3000
3500
4000
PPT (mm)ANNUAL TOTAL PRECIPITATION
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6
8
10
12
14
16
18
20
22
24
26
28
MAT (°C)MEAN ANNUAL TEMPERATURE
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0.4
0.8
1.2
1.6
2
2.4
2.8
3.2
3.6
g m−2LEAF NITROGEN CONCENTRATION(AREA BASED)
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0
1
2
3
4
5
6
7
8
Narea
(g m
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MAT (°C)
0 500 1000 1500 2000
0
1
2
3
4
5
6
7
8
Narea
(g m
−2)
PPT (mm)
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