PROJECTED TIMBER SUPPLIES — 1970 LEVEL OF MANAGEMENT 



69 



Table 56. — Supplies of roundwood products per acre in the North, by owner class and species group, 1952. 



1962, and 1970, with projections to 2020 



[Cubic feet] 



Owner class and species group 



1952 



1962 



1970 



Projections 



1980 



1990 



2000 



2020 



National Forests: 



Softwoods.. - _- 



2. 1 

 3.3 



2. 5 

 4. 3 



2.8 

 4.4 



5. 5 

 9.4 



7.9 

 12. 2 



10.3 

 15.8 



10. 3 



Hardwoods _____ 



16. 



Total. .. 





5.4 



6.8 



7.2 



14. 9 



20. 1 



26. 1 



26. 3 



Other public: 

 Softwoods. 





1.8 

 3.3 



1.9 

 4. 1 



2.3 



4.4 



4.3 

 10. 7 



6.2 

 15. 1 



8. 

 19. 8 



8. 1 



Hardwoods ____ 



19. 9 



Total . ..... ... 





5. 1 



6. 



6.7 



15. 



21. 3 



27.8 



28. 



Forest industry: 

 Softwoods. 





9.8 

 9. 4 



8.7 

 8.3 



9. 6 



8.4 



11. 7 

 10. 3 



13.8 

 12. 1 



16. 6 

 14. 3 



16. 6 



Hardwoods 



Total ... 



14.3 



19. 2 



17. 



18. 



22. 



25.9 



30. 9 



30. 9 



Farm and miscellaneous private: 

 Softwoods 

 Hardwoods. _ 





3.3 

 9.2 



2.5 

 8. 1 



2. 6 



8.7 



3.5 

 15. 1 



3.8 

 20. 



4. 2 

 24. 4 



4. 2 

 24. 8 



Total 



All owners: 

 Softwoods 





12. 5 



10. 6 



11.3 



18. 6 



23. 8 



28. 6 



29. 



3.5 



8. 1 



2.9 

 7.4 



3.3 



7.9 



4.5 

 13.8 



5.4 

 18. 1 



6.4 

 22. 2 



6. 5 



Hardwoods 



Total .. 



22. 4 



11.6 



10. 3 



11. 2 



18. 3 



23.5 



28. 6 



28. 9 







with growing-stock trees. This mainly reflects lands poletimber stands predominated, whereas 



reductions in radial growth and increases in sawtimber stands were more important on forest 



mortality resulting from increased stocking in industry lands. 



younger stands, and the occupancy of much forest T , _ , . 



land by rough and rotten trees or nontimber cover. 'rends in limber Inventories . 



Net annual growth rates as a percent of the Because of the substantial surplus of net growth 

 growing stock inventory averaged about 3.6 per- over removals in recent years, volumes of growing 

 cent in 1970. A moderate drop to an average of 2.6 stock in the North increased about 42 percent 

 percent by 2000 is estimated under the assump- between 1952 and 1970 to an average of 875 cubic 

 tions of this section, largely to the projected feet per acre (table 58). Forest industry lands 

 buildup of both softwood and hardwood in- and National Forests supported the heaviest 

 ventories. inventory volumes per acre in 1970, and such 



Many of the differences in growth and in stand differentials are projected to continue. For all 

 conditions among ownership classes are the re- owners combined, the average inventory per acre 

 suit of differences in forest types and levels of under the assumptions of this chapter is pro- 

 management. Thus larger inventories per acre and jected to increase a further 33 percent by 2020. 

 higher levels of growth on National Forests and 



forest industry lands reflect in part higher pro- PROJECTIONS OF TIMBER SUPPLIES IN THE 

 portions of the more productive types such as ROCKY MOUNTAINS 

 maple-birch-beech and spruce-fir. Farm and mis- 

 cellaneous private lands, on the other hand, The Kocky Mountain section contained 14.2 

 include relatively large proportions of the oak- percent of the Nation's timber inventory in 1970, 

 hickory type which generally occupies the drier and accounted for 7.1 percent of the total national 

 and less productive uplands. output of roundwood products. Some 4 percent of 



Proportions of stand-size classes in 1970 also the Nation's lumber and wood products establish- 

 differed considerably by ownership. On public ments were located in this area in 1967; these 



