72 



THE OUTLOOK. FOR TIMBER IN THE UNITED STATES 



Table 60. — Timber removals, net growth, mortality, supplies of roundwood products, and inventories in the 

 Rocky Mountains, 1952, 1962, and 1970, with projections (1970 level of management) x to 2020 



[Million cubic feet] 



Item 



1952 



1962 



1970 



Projections 





1980 



1990 



2000 



2020 



SOFTWOODS 



Removals from growing stock: 

 Roundwood products 



466 

 57 

 10 



646 

 79 

 13 



815 



103 



16 



1,008 



99 



160 



1, 104 



92 



171 



1, 241 



89 



177 



1, 197 



Logging residues. _____ 



67 



Other removals. ... . . 



181 







Total 



533 



738 



934 



1,267 



1,367 



1,507 



1,445 



Net growth _ _ . 



Mortality __ ... .... _ . 



1,096 

 567 



1,245 

 600 



1,289 

 564 



1,404 

 587 



1,476 

 595 



1,492 

 601 



1,520 

 604 



Roundwood supplies: 



From growing stock _ _ _ 



From other sources 2 ._ _ 



466 

 29 



646 

 38 



815 



38 



1,008 

 36 



1, 104 

 35 



1,241 

 34 



1, 197 



34 







Total __ 



495 



684 



853 



1, 044 



1, 139 



1,275 



1, 231 







Inventory of growing stock. . . _ _ 



85, 043 



91, 265 



87, 712 



89, 244 



90, 396 



91, 179 



91, 745 







HARDWOODS 



Removals from growing stock: 

 Roundwood products 



3 



( 3 ) 

 ( 3 ) 



3 



( 3 ) 

 ( 3 ) 



3 



( 3 ) 

 ( 3 ) 



33 



2 



14 



52 



3 



16 



76 



4 



17 



77 



Logging residues. _ _ _ _ _ 



4 



Other removals. . _____ 



16 







Total _ _ _ _ ... _ ___ 



3 



3 



3 



49 



71 



97 



97 







Net growth __. ___________ 



57 

 35 



66 

 39 



72 

 49 



90 

 36 



95 

 38 



94 

 39 



96 



Mortality. ... 



39 







Roundwood supplies : 



From growing stock .... 



3 



8 



3 



11 



3 



8 



33 

 13 



52 

 13 



76 

 12 



77 



From other sources 2 _ __ ____ 



12 







Total _ . -. _ .... _ 



11 



14 



11 



46 



65 



88 



89 







Inventory of growing stock. _____ 



3,960 



4,487 



4,507 



5,043 



5,359 



5,495 



5, 438 







1 Plus other area and harvesting assumptions specified 

 in this chapter. 



2 Includes roundwood products from rough and rotten 

 trees, dead trees, and trees on noncommercial and non- 



movals between 1952 and 1970 (tables 60 and 61 

 and figs. 34 and 35). Acceptance of smaller tree 

 sizes for roundwood products also is evidenced 

 by a 75 percent increase in removals of trees 

 5.0 inches and larger, compared with a 68 percent 

 increase for removals of sawtimber, that is, 

 the saw-log portion of sound trees 9.0 inches and 

 larger. Some of this expanded harvesting reflects 

 cutting for pulp wood. Some is the result of using 

 modern equipment for production of lumber 

 from small timber. 



Hardwoods play a very minor role in the Rocky 

 Mountains. In 1970 they comprised 4.9 percent 

 of the inventory and 0.3 percent of total removals 



forest land. 



3 Less than 0.5 million cubic feet. 



Note: Estimates are for trend levels and consequently 

 may differ from actual figures for the specified years. 



(table 60). Only 4 percent of the net growth of 

 hardwoods was removed in 1970. 



Under the assumptions concerning trends in 

 commercial timber] and areas and continuance 

 of forest management at 1970 levels, available 

 removals in this base projection have been esti- 

 mated to increase substantially in cubic feet, 

 and to rise moderately for sawtimber. 



These projections indicate the possibility of a 

 61 percent increase by 2000 in softwood growing 

 stock removals above actual removals in 1970, 

 and a 22 percent increase in sawtimber removals. 

 More than half of the projected increase in re- 

 movals occurs before 1980, based on the assump- 



