164 



TIMBER RESOURCES FOR AMERICA'S FUTURE 



An Excess of Growing- Stock Growth 

 Over Cut Is Important for Con- 

 tinued Sawtimber Balance 



In table 100 and the preceding text tabulation, 

 it will be seen that the ratios of growth to cut for 

 growing stock are generally higher than corre- 

 sponding ratios for sawtimber. This simply means 

 that growth-cut balances are better when we con- 

 sider merchantable trees of all sizes than when we 

 consider only the larger and generally higher 

 quality trees. 



Growth is distributed more uniformly than cut 

 among trees of all size classes. So long as most of 



the commercial timber is cut from the large trees, 

 therefore, a balance of cubic-foot growth and cut 

 of total growing stock will not give a balance of 

 sawtimber growth and cut. Conversely, with any- 

 thing like the present pattern of size classes in 

 timber cut, a balance of sawtimber growth and cut 

 will generally be accompanied by a surplus of 

 growth over cut of total growing stock. 



For this reason, growth-cut ratios for sawtimber 

 are more significant than those for growing stock. 

 If sawtimber ratios are favorable, growing-stock 

 ratios are likely to be even more so; but a favorable 

 growing-stock ratio may be misleading if the saw- 

 timber relations are not also considered. 



OAKS 



BEECH, BIRCH, MAPLE 



OTHER HARD HARDWOODS 



YELLOW-POPLAR 



OTHER SOFT HARDWOODS 



I CUT 

 GROWTH 



WHITE, RED, 

 AND JACK PINES 



SOUTHERN YELLOW PINES 



SPRUCE-FIR 



OTHER SOFTWOODS 





3 6 9 12 



BILLION BOARD-FEET 



15 



DOUGLAS-FIR 



HEMLOCK 



PONDEROSA AND 

 JEFFREY PINES 



WHITE AND SUGAR PINES 



REDWOOD 



OTHER SOFTWOODS 



HARDWOODS 



CUT 

 GROWTH 



3 6 9 12 



BILLION BOARD-FEET 



Includes Coastol Alaska 



Figure 66 



Figure 67 



