EFFECT OF GRAZING ON WESTERN YELLOW PINE. 



13 



Table 3. — Seedlings killed by sheep, by sizes. 

 (Percentages of total numbers on grazed plots.) 



Year and size class. 



Western 

 yellow 

 pine. 



Douglas 

 fir. 



Lodge- 

 pole pine. 



All. 



1912: 



Less than 1 year ' 



1 year old to 6 inches high. . 



6 inches to H feet 



1913: 



Less than 1 year 



1 to 2 years 



2 years old to 6 inches high. 

 6 inches to 1 J feet 



1914: 



Less than 1 year 



1 to 2 years 



2 to 3 years 



3 years old to 6 inches high. 

 6 inches to 1J feet 



Average: 



Less than 1 year 



1 to 2 years 



2 to 3 years 



3 years old to 6 inches high. 

 6 inches to H feet 



13.7 

 3.1 



18.5 



2.7 



5.6 

 3.1 



13.4 

 3.0 



25.9 



17.9 



11.1 



4.4> 



7.1 



7.2 



.8 



2.2 



1.6 



4 





.9 



39.4 



6.7 



15.7 



15.5 



20.3 



10.9 



9.1 



9.9 



23.6 



.4 



1.6 



1.4 



3 



.2 





22.4 



17.8 



10.8 



10.8 



13.9 



9.9 



9.1 



9.9 



23.6 



1.5 



2.1 



2.2 



.2 





.6 



21.8 



5.5 



1.6 



.3 



22.2 



14.4 



11.4 



1.1 



.2 



19,8 



11.0 



11.4 



1.9 



.2 



i Number killed by sheep in 1912 partly estimated. 



Tables 4 and 5 show the rate of growth in height of the important 



species on the Deadwood allotment, which corresponds to sites of 



poorer quality than the average, and on the South Fork allotment, 



which corresponds to average or better western yellow pine sites. 



The figures given represent growth of advance reproduction, mostly 



under timber rather than in openings. For comparison, the growth 



of dominant western yellow pine seedlings in eastern Oregon 1 is also 



shown. 



Table 4. — Juvenile height growth on experimental area. 





Western yellow pine. 



Douglas fir. 



Lodgepole 

 pine. 



Age in years. 



Deadwood. 



South 

 Fork. 



Blue 

 Mountains. 



Deadwood. 



South 

 Fork. 



Deadwood. 





Height in feet. 



5 



0.3 

 .6 

 1.2 

 2.0 

 3.0 

 4.2 

 5.7 

 8.2 

 586 



0.5 

 .9 

 2.1 

 3.5 

 5.5 

 9.6 

 13.9 



0.8 

 1.7 

 2.7 



0.2 

 .4 

 .8 

 2.4 

 2.1 

 2.8 

 3.7 

 4.7 

 914 



0'.2 

 .6 

 1.3 

 2.2 

 3.6 

 5.5 

 9.5 



0.2 



10 



.6 



15. . 



1.3 



20 



2.4 



25. 





4.0 



30 ...a .. 





6.2 



35. 





10.0 



40 





15.7 



Number seedlings basis 



738 



1,182 



521 



206 



Table 5. — Years required to reach a given height. 





Deadwood. 



South Fork. 



Height i«n feet. 



Western 

 yellow 

 pine. 



Douglas 

 fir. 



Lodgepole 

 pine. 



Western 

 yellow 

 pine. 



Douglas 

 fir. 



0.5 



Years. 

 8 

 17 

 23 

 27 

 31 

 35 



Years. 

 12 

 20 

 28 

 34 

 39 

 43 



Years. 

 9 

 16 

 20 

 24 

 27 

 29 



Years. 

 5 

 13 

 17 

 20 

 23 

 25 



Years. 



10 



1.5 



16 



2.5 



20 



3.5 



25 



4.5 



28 



5.5 



30 







i From United States Department of Agriculture Bulletin 418, Western Yellow Pine in Oregon, by T. T. 

 Munger. 



