74 



THE OUTLOOK FOR TIMBER IN THE UNITED STATES 



Net growth and removals of growing stock in the 

 Rocky Mountains 





hardwoods 





net growth -. 



removals 





1952 1962 1970 I960 1990 2000 2010 2020 



Figure 34 



Net growth and removals from sawtimber in the 

 Rocky Mountains 



softwoods 



net growth 

 removals 



hardwoods 



net growth removals 



L /- ^ 



1952 1962 1970 1980 1990 2000 2010 2020 



Figure 35 



movals of timber volumes on lands shifted from 

 timber to other uses. 



It has been assumed in these base projections 

 that an increasing amount of the material now left 

 as logging residue will be utilized for products in 

 the future. Other removals are projected at a 

 relatively high level in accordance with earlier 

 assumptions on area trends. 



In addition to roundwood products from growing 

 stock, some production of roundwood is obtained 

 from rough, rotten, and dead trees and from 

 trees on areas not classified as commercial timber- 

 land. Materials from these sources amounted to 

 nearly 5 percent of all roundwood produced in 

 1970 (tables 60 and 61). 



Available supplies of softwood roundwood from 

 all sources are projected to increase about 50 per- 

 cent between 1970 and 2000 to nearly 1.3 billion 

 cubic feet (tables 60 and 63). A large projected 

 increase in available output from National Forests 

 mainly reflects the fact that actual timber har- 

 vests on National Forests in 1970 were about 27 

 percent below the estimated allowable cuts used 

 as the basis for these supply projections. 



Achievement of the full allowable cut as assumed 

 would require higher prices than in 1970. Also, it 

 appears that new studies of multiple-use manage- 

 ment requirements, and new studies of areas for 

 possible wilderness designation, will result in 

 somewhat lower levels of allowable cut than 

 estimated in this section. Increased management 

 and/or utilization efforts could serve to prevent or 

 minimize such reductions in available supplies, as 

 indicated in the following chapter. 



Sawtimber supplies. — Available output of soft- 

 wood roundwood in board feet of sawtimber size 

 material increases only moderately in these pro- 

 jections in contrast to the projected rise of 50 

 percent in available output in cubic feet (table 64 

 and fig. 36). Projected harvests from National 

 Forests represent nearly 59 percent of the total 

 projected output of sawtimber products. 



Increases in sawtimber production also are pro- 

 jected for other public lands and for farm and 



Table 62.— Components of softwood growing stock removals in the Rocky Mountains, 1952, 1962, and 



1970, with projections to 2020 



[Percent] 



Component 



1952 



1962 



1970 



Projections 





1980 



1990 



2000 



2020 



Roundwood products 



87 



11 



2 



87 



11 



2 



87 



11 



2 



8 

 12 



81 



7 



12 



82 



6 



12 



83 



5 



12 



Logging residue. 



Other removals. 





Total removals. _ 



100 



100 



100 



100 



100 



100 



100 





