Primary Producers 225 



FIGURE 5-29. Tiller types in Carex aquatilis. (After Shaver 

 and Billings 1975.) 



500 



?£ 400 



E 

 . 300 



I 200 



o 



- 100 



120 



100 



80 



'E 





60 



40 



-2 20 



-| 1 1 1 r 



T 1 1 1 r 



FIGURE 5-30. Biomass of vascular plants, standing stock of chlor- 

 ophyll, and concentration of chlorophyll near Barrow. (After 

 Johnson and Tieszen 1973.) 



