700 ^ 



600- 



500- 



400- 



300 



200- 



100- 



•• Agsm/Bogr 



• Bogr/Agsm 



• Sfco/Bogr-Cofi 



• Bogr-Cafi/Stco 



• St CO- Agsm/Bogr 



• Agsp/Bogr-Cafi 



• Arca/Agsm/ Bogr 



• Bogr 



900-1 



800- 



700- 



600- 



500- 



400- 



300- 



200- 



100- 



-i 1 r 



1977 1978 1979 1980 



• Stco/Bogr-Cofi 



• Bogr-Cofi/Stco 



*— • — Stco-Agsm/Bogr 



1 1 



1977 1978 



1979 



1980 



Figure 14. Net aerial production of 



Bouteloua gracilis in seven 

 communities, 1977-1 980. 



Figure 15. Net aerial production 

 of Stipa comata in 

 three communities, 

 1977-1980. 



-16- 



