Table XLVIII. Nitrogen fixation by tenestrial ecosystem components 



alpine tundra. 



Equivalent 

 Ethylene produced N fixation 



Oumoles/hr) x 10"^ (^g-at/hr) x 10" 



At% 

 excess* 



15 



N 



Site A 



Loiseleuria procumens 

 Dryas octopetala 

 Oxytropis ( nigrescens )? 

 Peltigera aphthosa (L) Willd, 

 Stereocoulon sp. 

 Stereocoulon sp . 



.029 



0.14 



8.2 



547.0 



42.8 



142.0 



1.8 



9.3 



540.0 



364.0 



28.5 



94.6 



0.02 



Site B 



Nephroma arcticum (L.) Torss, 



2.3 



152.0 



Site C 



Carex cancocens 

 Hippuris vulgaris 

 Potentilla palustris 

 Eriophorum scheuchzeri 

 Carex aquatilis 



Site D 



Sparganium minimum 

 Nostoc sp. 

 Pond Water 



0.014 



0.14 



0.058 



0.106 



0.082 



0.35 



6.3 



0.058 



1.0 

 9.4 

 3.8 

 7.0 

 5.4 



22.0 



420.0 



3.8 



4.41 



Site E 



Oxytropis scammaniana 

 Saxifraga oppositifolia 



Site F 



Carex saxatilis 

 Viola epipsila 

 Star Moss 



0.031 

 0.062 



0.029 

 0.026 

 0.041 



2.0 

 4.2 



1.8 

 1.8 

 2.8 



Miscellaneous 

 Anabaena sp. 



0.38 



24.0 



53.91 



Nitrogen-15 results only: 



Site C pond water concentrate 0.581 at% excess 



* Only a limited number of these have been processed to date, 

 will appear in the final report. 



Many more 



120 



