104 



L. L. Tieszen et al. 



TABLE 4-1 



Maximum Photosynthetic Rates of Field-grown 

 Tundra Plants at the Tundra Biome Research 

 Area under Ambient Light and Temperature 

 Regimes 



Species 



Leaf area basis 

 (mg CO2 dm"' hr" 



Dry weight basis 

 (mg CO2 gdw' hr') 



Barrow 



Deciduous dwarf shrubs' 

 Salix pulchra 



Mosses' 



Pogonatum alpinum 

 Calliergon sarmentosum 

 Polytrichum commune 

 Dicranum angustum 

 Dicranum elongatum 



28 



35 

 37 

 34 

 33 

 24 

 25 



33 

 12 

 14 



17 

 21 



4.4 

 2.7 

 2.9 

 1.0 

 1.3 



Niwot Ridge 



'Tieszen (1973, 1975, unpubl.) and Tieszen and Johnson (1975. 

 'Oechel (1976), Oechel and Collins (1976), and Oechel and Sveinbjornsson 

 (1978). 

 'Johnson and Caldwell (1974). 



