Table 32. — Average annual cut of trees of saw-timber size 1925-36, 7937-39, assumed cut 7936-65, and allowable cut on available lands 7966, 



by type group, class of cutting practice, and Jorest-survey unit 



fin million board feet— i. e.. 000,000 omitted] 





1925-36 



1937-39 



Assumed, 1930-65 



Allowable under sustained yield, 1966 



Unit 



Ponderosa 

 pine types 



Other types 



Ponderosa pine typos ' 



Other types 





50-50 



75-50 



95-75 



Eastern Washington: 



Cholan-Colville 



161 

 145 



21 



190 

 161 

 23 



147 



ins 



9 



13 

 45 

 11 



113 

 108 



107 



100 



6 



75 



84 



5 



120 





123 



North Blue Mountain 



14 







Total 



327 



374 



264 



69 



228 



213 



164 



257 







Eastern Oregon: 



North Blue Mountain _ 



113 

 256 

 133 

 430 



131 

 343 

 232 

 667 



102 

 275 

 207 

 500 



8 



5 



5 



32 



87 

 150 

 188 

 256 



77 

 141 

 175 

 231 



61 

 116 

 152 

 184 



67 



Deschutes River .■_ ... 



38 



South Blue Mountain. 



28 



Klamath Plateau 



15 



Total 



932 



1, 373 



1,084 



50 



681 



624 



513 



148 







Region total -.. . .. 



1,259 



1,747 



1,348 



119 



909 837 ! 677 



405 













i Allowable cut under sustained yield if cutting in the ponderosa pine types during the period 1936-65 takes the form (50-50) of light selection on al 

 lands; (75-50) heavy selection on private, light selection on other lands; and (95-75) virtual clear cutting on private, heavy selection on other lands. 



and value of the whole stand, the actual saving 

 should be considerably more. Assuming that 

 cutting takes a middle course (75-50), the esti- 

 mated volume in the ponderosa pine types as of 

 1966 would represent a saving of 3.1 billion board 

 feet. 



In the types other than ponderosa pine 9 a small 

 net volume reduction, from 30.3 billion board feet 

 to 29.5 billion board feet, is shown for the period 

 1936 to 1965. 



Thus it appears that a materially reduced but 

 still substantial supply of saw timber will remain 

 in the region in 1966 if, from 1936 on, forest prac- 

 tice is at least as effective in maintaining a growing 

 stock as it was previously. 



Allowable Cut, 1966 



If the rate of saw-timber cut from 1936 to 1965 

 approximates that assumed for this period (1,467 

 million board feet annually), and there is mean- 

 while no material change in method of cutting, 

 the sustainable annual cut from the ponderosa 



9 Owing to the small amount of exploitation anticipated 

 in this type group within the next 30 years, clear cutting 

 only was assumed for this group. This assumption docs 

 not imply that there may not be real advantages in selective 

 cutting for these as well as for the ponderosa pine types. 



pine types for the succeeding cycle will drop from 

 1,348 to 677 million board feet (table 32), or about 

 50 percent. If a heavier cut is made under these 

 circumstances even greater future reduction will 

 be necessary. If accessible, the upper-slope, Dou- 

 glas-fir, and other nonpine types could build up a 

 total annual cut of 1,082 million board feet, or 74 

 percent of the assumed annual cut for 1936-65. 



The sustainable cut as of 1966 from the ponderosa 

 pine types could be increased more than one-third, 

 or to 67 percent of the 1936-65 cut, if maturity- 

 selection cutting (50-50) were immediately put into 

 practice and applied uniformly (table 31). 



The prospect of an enforced 50 percent reduction 

 in sawlog production, or even a 33 percent reduc- 

 tion, for the region as a whole, although unpleasant, 

 fails to emphasize the gravity of the local situation 

 with respect to the ponderosa pine saw-timber sup- 

 ply. The outlook in the Klamath Plateau and the 

 Deschutes River units is most unfavorable. For 

 example, if the current trend continues, the cut from 

 pine types in the Klamath Plateau unit may aver- 

 age 500 million board feet annually for the period 

 1936-65. If it does, the remaining saw timber 

 would support production at only 37 percent of this 

 level for the following cycle. In the Deschutes 

 River unit the trend indicates that the pine types 



77 



4C2111V 



12 -6 



