PROJECTED TIMBER SUPPLIES 1970 LEVEL OF MANAGEMENT 



63 



Table 48. — Net growth rates of growing stock in the South, by owner class and species group, 1952, 1962, 



and 1970, with projections to 2020 



[Percent of inventory] 



Owner class and species group 



1952 



1962 



1970 



Projections 





1980 



1990 



2000 



2020 



National Forests: 



Softwoods - - - 



5.9 

 3.3 



6. 2 

 3.6 



5.8 

 3.6 



4.6 

 3.0 



3.9 



2.7 



3.6 

 2.5 



3. 6 



Hardwoods -- _ . . 



2.5 







Total - - _ - 



48 



5. 1 



4.8 



4. 



3.4 



3. 2 



3. 2 







Other public : 



Softwoods. _ 



5.9 

 3.9 



5.6 

 3.9 



5.8 

 4.0 



5. 2 

 3.8 



4.8 

 3.6 



4.5 

 3.5 



4. 6 



Hardwoods. _ . . . 



3. 5 







Total . -- --- --- 



5.0 



4.7 



4.9 



4.6 



4.3 



4. 1 



4. 1 







Forest industry: 



Softwoods _ . . _ . _. . _ . . 



6.8 

 3.4 



6.7 

 3.5 



6.8 

 3.7 



6.3 



3.8 



5.8 

 3.7 



5.6 

 3.7 



5. 6 



Hardwoods _ 



3. 7 







Total.. . -. -. ------ 



5.4 



5.5 



5.7 



5.4 



5. 1 



5. 



5. 







Farm and miscellaneous private: 



Softwoods.. ______ _ - _ 



6.5 



3.7 



6.9 

 3.9 



7.2 

 4.0 



6.9 



4. 1 



6.6 



4. 1 



6.4 

 4. 1 



6. 4 



Hardwoods. _ _ 



4. 1 







Total- -. --_ -_ .- 



4.7 



5.0 



5.4 



5.4 



5.3 



5.2 



5. 2 







All owners : 



Softwoods . _- . - _. 



6.5 

 3.6 



6.7 

 3.8 



6.9 

 4.0 



6.4 

 4. 



6.0 

 3.9 



5.8 

 3.9 



5. 8 



Hardwoods. _ _ 



3. 9 







Total .- -. .. 



4.8 



5. 1 



5.4 



5.2 



5.0 



4.9 



4. 9 







Net growth and removals of sawtimber 

 in the North 



12 ---"" 



y hardwoods 



./*-net growth / 

 £ 8 -S /rem, 



,v_,s 



< / 

 2 6 / 





_! net growth 



softwoods 



4 , 



___. 



— ^ -~"^" 





removals 







M 



1952 1962 '970 1980 1990 2000 2010 2020 



Figure 31 



age classes on those areas and a policy of building 

 up timber inventories to emphasize sawtimber 

 harvests under relatively long rotations. 



The heaviest cutting in relation to net growth 

 has been on private lands. But on both forest 



industry and farm and miscellaneous holdings, 

 removals of softwoods and hardwoods in 1970 

 amounted to about half the net annual growth. 



Under the area and harvesting assumptions 

 used in developing these particular projections, 

 that is, with projected removals rising to equal 

 net growth by the year 2000, net growth of 

 softwood growing stock is estimated to decrease 

 about 18 percent from the 1970 level, whereas 

 available removals of softwoods are projected to 

 rise by 88 percent. 



Hardwood net growth in cubic feet is projected 

 to increase somewhat then decline slightly by the 

 year 2000 with rising stand density. Total re- 

 movals, however, are projected to increase some 

 140 percent under the assumptions of these base 

 projections. After 2000 growth and removals drop 

 slightly because of the assumed drop in commer- 

 cial timberland areas. 



A breakdown of the data for growth and 

 removals reveals significant differences by tree size 

 class and quality. Growth takes place over the 

 entire timber inventory, whereas removals are 

 more heavily concentrated on selected species, 

 sueh as maple, birch, walnut, or white oak, for 



