Soil temperatures at all depths differed considerably between exposures and be- 

 tween elevations. Soils on southwest exposures were warmer than those on northeast 

 exposures, and soils at 7,100 feet were warmer than those at 8,200 feet. As was true 

 of air and soil surface temperatures, differences in soil temperatures at all depths 

 were much greater between elevations than between exposures. These differences in soil 

 temperature were : 



SOIL DEPTH 



20 am. 



) (a) 



50 am. 



(°F.) 



(a) 



100 am. 



(°F.) 



(a) 



Southwest exposure warmer 



At 7,100 feet by 

 At 8,200 feet by 



Lower elevation warmer 



On southwest exposure by 

 On northeast exposure by 



2.9 

 2.2 



6.6 

 5.6 



(1.8) 

 (2.0) 



(1.7) 

 (2.1) 



3.7 

 2.3 



7.4 

 5.9 



(1.6) 

 (1.5) 



(1.4) 

 (2.2) 



3.3 

 1.9 



6.8 

 5.3 



(1.3) 

 (1.2) 



(1.2) 

 (2.0) 



MAY 



JUNE 



JULY 



AUG 



SEPT 



OCT 



60 

 50 

 40 

 30 

 50 

 40 

 30 

 50 

 40 

 30 





























































/ 





















k 









\\ 



























20-CIVI. 

 DEPTH 

















































\ 

































































































0^ 





















— 





BO-CM. 

 DEPTH 



100-CM. 

 DEPTH 



18 20 22 24 26 28 30 32 34 36 38 40 42 44 



WEEK 



Figure 7. — Soil temperature at three depths at the station on the southwest exposure 

 at 7jl00 feet elevation: 5-year average and range. 



15 



