700- 



600- 



500- 



400- 



300- 



200- 



100- 





// 



• • • • • 'Agsm/Bogr 



• — Bogr/Agsm 



» Stco-Agsm/Bogr 



• Arca/Agsm/Bogr 



• Dist-Agsm 



T 



T 



1977 1978 



— I 1 



1979 1980 



1 r 



1978 1979 



Figure 12. Net aerial production of three 

 species in the Arca/Agsm/Bogr 

 community, 1977-1980. 



Figure 13. Net aerial production 

 of Agropyron smith! i 

 in five communities, 

 1977-1980. 



-15- 



