Control of Tundra Plant Allocation Patterns and Growth 153 



Source tiller 



VI (7%) 



Leaf 



Stem base 



Rhizome 



Root 



Inflorescence 



Leaf 



Stem base 



Rhizome 



Root 



VI (85%) 



V2(6%) 



V3 (2%) 



Source tiller 



V3 flowering (95%) 



FIGURE 5-6. Distribution of '"C in tillers and plant 

 parts of a Dupontia fisheri tiller system after the 

 source tiller (VI or V3 flowering) was labeled. (After 

 Allessio and Tieszen 1975a.) 



substantial degree of tiller independence and suggest that the large 

 belowground carbohydrate reserves may serve primarily to support late- 

 season root growth and maintenance and as a reserve for rapid leaf 

 growth in the event of grazing rather than to support the normal course 

 of leaf growth as had been previously assumed (Mooney and Billings 

 1960, Fonda and Bliss 1966). However, leaf growth in the spring may be 



