46 



THE OUTLOOK FOR TIMBER IN THE UNITED STATES 



mortality, and inventories. In estimating available 

 supplies of roundwood, utilization standards were 

 keyed primarily to practices of 1970 but with some 

 allowance for increased use of logging residuals as 

 a result of improvements in technology that 

 appear likely with ongoing programs of research 

 and development. 



These supply projections are believed to repre- 

 sent reasonable biological possibilities with a con- 

 tinuation of recent trends in forest conditions and 

 management. They are also designed to provide 

 a partial basis for judging possible changes in 



roundwood supplies in response to alternative 

 P iT-° e , trends ' as ln dicated in the final section of 

 this chapter, and in response to alternative man- 

 agement levels, as indicated in the following 

 chapter. b 



SUMMARY OF BASE PROJECTIONS OF 

 SUPPLIES FOR THE UNITED STATES 



A summary of timber removals, net growth, 

 mortality, roundwood supplies, and timber inven- 

 tories in the 1952-70 period, and projections for 



United btates, 1952, 1962, and 1970, with projections (1970 level of management) > to 2020 



1 Plus other area and harvesting assumptions specified 

 in this chapter. 



2 Includes roundwood products from rough and rotten 

 trees, dead trees, limbs, and trees on noncommercial 



[Billion cubic 



feetl 













Item 



1952 



1962 



1970 



Projections 





1980 



1990 



2000 



2020 



SOFTWOODS 



Removals from growing stock: 

 Roundwood products _ _ 



6. 6 

 . 9 

 .3 



6. 5 

 .8 

 .3 



8.4 

 .9 

 .3 



9. 5 

 .9 



. 4 



10. 1 

 .8 



. 4 



10.9 



.8 

 . 4 





Logging residues _____ 



11. 1 



Other removals 



. 7 





. 4 



Total 



7.8 



7.6 



9.6 



10. 8 



11.3 



12. 1 







12. 2 



Net growth 



7.8 

 2. 6 



9.3 

 2.7 



10. 7 

 2.8 



11. 3 

 2.8 



11. 6 

 2.9 



11.6 

 3.0 







Mortality ___ __ _. 



11. 9 





3. 



Roundwood supplies: 

 From growing stock 



6. 6 



.8 



6.5 

 .7 



8. 4 

 . 6 



9.5 

 . 6 



10. 1 



.6 



10. 9 

 .6 





From other sources 2 _ 



11. 1 





. 5 



Total 



7.4 



7.2 



9.0 



10. 1 



10. 7 



11.5 







11. 6 



Inventory of growing stock 



411.0 



427.2 



431.9 



436.4 



442. 1 



442. 7 









437. 8 



HARDWOODS 



Removals from growing stock: 

 Roundwood products 



2.6 



.8 

 . 7 



2. 4 



. 6 



1. 2 



2.7 



. 7 



1. 



4.8 

 .8 

 .3 



5.9 

 . 9 

 .3 



7.0 

 . 9 

 .3 





Logging residues 



7. 



Other removals. 



. 7 





. 3 



Total 



4. 1 



4.2 



4.4 



5.9 



7. 1 



8.2 







8. 



Net growth 



6. 1 

 1. 3 



7. 1 

 1.5 



7.9 

 1.7 



8.2 

 2.0 



8. 2 

 2. 1 



8. 

 2.2 





Mortality 



7. 8 





2. 1 



Roundwood supplies: 

 From growing stock 



2. 6 



.8 



2. 4 

 . 6 



2.7 



.5 



4.8 

 .4 



5.9 



. 4 



7.0 

 . 4 



7.0 



From other sources 2 





. 4 



Total 



3.4 



3.0 



3.2 



5. 2 



6.3 



7.4 







7. 4 



Inventory of growing stock_. 



172. 1 



196. 7 



217.0 



245.9 



262.9 



267. 6 



268.9 





and nonforest land. 



Note: Estimates are for trend levels and consequently 

 may differ from actual figures for the specified years. 



