0 50 100 150 200 250 3000

2

4

6

8

10

12

14St

emw

ood

C (k

gC m

-2)

Temperate(a)

0 50 100 150 200 250 3000

5

10

15

20

25

Stem

woo

d C

(kgC

m-2

)

Tropical(b)

Individual cellsMeanTarget growth curveMean curve for natural PFT

0 50 100 150 200 250 300Age (yr)

0

5

10

15

20

Stem

woo

d C

(kgC

m-2

)

Boreal(c)