CARBON FERTILIZATION EFFECTS IN A SIMULATED ECOSYSTEM 339 



1200 



H 

 O 



sJ 1000 



E 



°. 800 



cc 



< 600 



_i 

 < 



CO 



< 400 



CD 



200 



I , + 1 00% 

 t , Normal 



TT 



Balsam fir 

 762-m elevation 

 1.6-m soil depth 



(C) 



— 6 



9 1 



6v 



99 



ii_L 



9$Y 



no 



999 



99 T 



99 



9 " 



:: <>"T ' :: t,l° "" 



Plpim) 



i I i 1 i 



T T T 



1 Y9? •■ 



^ u 



nil 



40 80 120 160 200 240 280 320 360 400 440 480 520 



YEARS SINCE CLEAR-CUT 



3200 



2400 



E 

 o 



< 



LLI 

 (X 

 < 



< 

 00 



< 



CO 



< 

 O 



1600 



800 



T tQ 



n 



1 



.§ 



:: 



I I I I I 



J , + 100% 

 • , Normal 



White birch 

 762-m elevation 

 1.6-m soil depth 



(d) 



1 " i 



ti I i I itiiiJ i I ulali&LAiai I I 1 I I I 1 I 



40 80 120 160 200 240 280 320 360 400 440 480 520 



YEARS SINCE CLEAR-CUT 



