FOREST PLANTING IN THE INTEBMOUNTAIN REGION. 



27 



Table 12. — Record of experimental plantations of Douglas fir in the inter mountain 



region — Continued. 



Site. 



Planting record. 



Percentage of survival by years. 



Vigor- 

 ous 

 trees. 



Average 



No. 



Description. 



Age. 



Date. 



1st 

 year. 



2d 

 year. 



3d 

 year. 



4th 

 year. 



height 

 growth. 



47 



Lamb's Canyon water- 

 shed, Wasatch National 

 Forest, Utah: 



3-2 



2-2 



3-2 

 2-1 

 2-1 

 2-1 

 2-2 

 2-1 

 3-0 

 2-0 

 3-2 

 2-1 

 2-1 

 2h-0 

 3-0 

 3-2 



2-1 

 2-1 

 2-1 

 2-2 

 2-2 



2-1 



May, 1920 



Apr., 1915 



Apr., 1918 

 May, 1917 



...do 



...do 



...do 



...do 



—do 



—do 



...do. 



...do 



—do 



...do 



Apr., 1918 

 —do 



June, 1917 

 Oct., 1915 



...do 



—do 



—do 



June, 1917 



66 



58 



82" 

 78 

 84 

 88 

 78 

 89 

 94 

 97 

 84 

 80 

 86 



34 



50 



1 



37 



25 



76 



39 

 34 

 96 



89" 

 95 







Per cent. 

 24 



20 



88 

 10 

 24 

 10 

 15 

 7 

 12 

 11 

 59 

 34 

 48 

 20 

 72 

 95 



Inches. 



48 



Beaver Creek watershed, 

 Wasatch National For- 

 est, Utah: 

 Aspen 









30 

 30 



Mink Creek watershed, 

 Cache National Forest, 

 Idaho: 



Brush, temporary 



Do 



94 

 36 

 54 

 48 

 53 

 25 

 61 

 56 

 74 

 60 

 64 

 68 

 88 

 95 



--- 



1.40 



30 



Do... 





49 



Aspen 





49 



Do 





49 



Do... 





49 



Do 





49 



Do.. 





49 



Do 



1.10 



49 



Do 



Do.. 





49 





49 



Do 





49 



Do 



Do 





49 





50 



Rock Creek watershed, 

 Targhee National For- 

 est, Idaho: 



Aspen, bench 



Aspen, north slope 



Aspen, bench 





50 

 50 



35 





(12) 



10 



1.10 



50 



Aspen, north slope 



Aspen, bench 



Darby Canyon watershed, 

 Targhee, National For- 

 est, Wyo.: 







(13) 



8 



1.20 



50 









51 







24 



4 



.30 













12 Observation in fifth year showed 14 per cent survival. 



13 Observation in fifth year showed 8 per cent survival. 



2. In Utah, underplanting wdth Douglas fir may be done success- 

 fully in the lower half of the aspen zone (below an altitude of 8,300 

 feet), the success increasing as the altitude decreases, owing mainly 

 to the smaller losses from snow-molding. Good results may be se- 

 cured under dense aspen where the light intensity is as low as 0.2 

 that of normal sunlight. (PL VII, fig. 1.) 



3. Planting under dense aspen cover above an altitude of 8,300 feet 

 in Utah is accompanied by uncertain results due primarily to snow 

 molding. 



4. Plantations in the open escape much of the heavy winter loss, 

 but summer losses are considerably greater and satisfactory survival 

 is difficult to secure except where the trees are planted on the north 

 sides of bushes or down logs. 



5. In the oak-brush zone winter loss is distinctly secondary to 

 summer drought and frost injury, both of which increase with a 

 decrease in altitude. These losses are reduced by planting under 

 cover on northern aspects. 



6. Flat, open, grass or sage covered areas where the trees must 

 enter into competition with established vegetation for moisture 



