1934 



© 



1936 



.S 

 .S 



•S 

 •S 



.s 

 .s 



.s 



/^ 



.s -s .s 



.s .s -s 



•s .s 



Scale 

 5 10 15 20 40cm 



Chart 4. Changes in species composition and basal area on a permanent 

 meter-square quadrat from 1934 to 1952 at the U. S. Sheep Experiment Sta- 

 tion, near Dubois, Idaho, altitude 5500 ft. A letter symbol with no area mapped 

 indicates plant cover of less than 0,5 cm^. (A) Agropyron spicatum; (P) Poa 

 secunda; (S) Stipa comata; (•) seedling. (After Blaisdell, J. P. (15A), "Seasonal 

 Development and Yield of Native Plants on the Upper Snake River Plains and 

 Their Relation to Certain Climatic Factors," Figure 9, U. S. Dept. Agric. 

 Tech. Bull, No. 1190, 1-68 (1958).) 



104 • THe Community 



