66 



THE OUTLOOK FOR TIMBER IN THE UNITED STATES 



Table 52. — Sawtimber removals, net growth, mortality, supplies of roundwood products, and inventories in 

 the North, 1952, 1962, and 1970, with projections (1970 level of management) x to 2020 



[Million board feet] 



Item 



1952 



1962 



1970 



Projections 





1980 



1990 



2000 



2020 



SOFTWOODS 



Removals from sawtimber: 



Roundwood products. . . 



1,669 



62 



134 



1,322 



48 



128 



1,856 



65 



181 



2, 132 



64 



112 



2,756 



74 



122 



3,535 



89 



125 



3,535 



Logging residues _ 



78 



Other removals.. . . 



126 







Total ....... . 



1,865 



1,498 



2, 102 



2,308 



2,952 



3,749 



3,739 







Net growth . _ 



2,383 

 380 



2,807 

 503 



3,594 

 661 



3,509 



775 



3,521 



852 



3,615 



882 



3,603 



Mortality. _ . . ... 



883 







Roundwood supplies : 



From sawtimber. _ .. _ .. 



1,669 

 229 



1,322 

 166 



1,856 

 258 



2, 132 



258 



2,756 

 258 



3,535 



258 



3,535 



From other sources 2 _ _ 



258 







Total. . . . 



1,898 



1,488 



2, 115 



2,390 



3,014 



3,793 



3,793 







Inventory of sawtimber. . . 



58, 939 



69, 203 



80, 061 



96, 897 



106, 472 



110, 103 



109, 887 







HARDWOODS 



Removals from sawtimber: 



Roundwood products 



3,913 

 390 

 530 



4,014 

 365 

 575 



5,497 

 448 

 903 



7,062 

 408 

 416 



9,411 

 447 

 455 



11, 553 

 473 

 468 



11, 408 



Logging residues. ... 



379 



Other removals . _ 



470 







Total . 



4,833 



4,954 



6,848 



7,886 



10, 313 



12, 494 



12, 257 







Net growth .. 



6,977 

 1, 141 



8,645 

 1,362 



10, 076 

 1,669 



11,337 

 1,949 



11, 835 

 2, 136 



12, 006 

 2, 209 



11, 767 



Mortality. _ 



2, 173 







Roundwood supplies: 



From sawtimber 



3,913 

 387 



4,014 

 415 



5,497 

 586 



7,062 

 586 



9,411 

 586 



11, 553 

 586 



11, 408 



From other sources 2 . _. 



586 







Total 



4,300 



4,430 



6,083 



7,648 



9,997 



12, 139 



11,994 







Inventory of sawtimber . 



187, 365 



221, 484 



251, 807 



295, 876 



323, 425 



331,211 



325, 152 







1 Plus other area and harvesting assumptions specified 

 in this chapter. 



2 Includes roundwood products from trees too small to 

 qualify as sawtimber, rough and rotten trees, dead trees, 

 and from trees on noncommercial and nonforest land. 



Note: Estimates are for trend levels and consequently 

 may differ from actual figures for the specified years. 



figures 32 and 33). In 1970 these holdings supplied 

 73 percent of all roundwood products, while forest 

 industry lands supplied 16 percent, and public 

 lands 11 percent. 



Roundwood production per acre. — Output of tim- 

 ber products per acre of commercial timberland 

 in 1970 ranged from about 7 cubic feet on public 

 lands other than National Forests, to 18 cubic 

 feet on forest industry lands. Under the assump- 

 tions of this section, available harvests are pro- 

 jected to increase from an average cut of 11.2 

 cubic feet per acre in 1970 to about 29 cubic 

 feet by 2000 (table 56). 



Trends in Net Growth Per Acre 



Average net growth per acre has risen 29 percent 

 since 1952 to an average of about 31 cubic feet 

 per acre (table 57) . With the level of management 

 and other conditions assumed in this section, 

 average net growth of growing stock for all owners 

 combined is expected to remain fairly constant at 

 about 31 cubic feet per acre. Some additional 

 growth would also occur on rough and rotten 

 trees. 



On public and industry lands some decrease 

 in net growth is projected as a result of industry 



