226 



A NATIONAL PLAN FOR AMERICAN FORESTRY 



trends as to areas and volumes of saw timber. Table 20 shows in a 

 summarized way these two features. Figure 18 compares possible 

 1950 volumes with the present. Under the assumptions made, 

 reductions both in saw- timber areas and in saw- timber volume would 

 probably be marked. These apparent reductions in saw- timber 



(1930 

 ENGLAND \\ 950 



MIDDLE /I930J 

 ATLANTIC 



LAKE 



CENTRAL 



Jl93O 

 11930 



UNITED STATES 



200 400 600 800 1000 1200 1400 1600 1800 

 BILLION BOARD FEET 



fl930 

 SOUTH (,960 



PACIFIC /I930 

 COAST 



N.ROCKY /I930 

 MOUNTAIN, 950 



S. ROCKY (1930 

 MOUNTAINJJ95Q 



I Softwood 



FIGURE 18. Present volume of hardwood and softwood saw timber and the estimated volume in 1950, by 

 regions. The 1950 estimate is based on the 1925-29 average drain in the West, and in the East on half 

 the 1925-29 drain. 



area could be minimized by a general adoption of silviculturally 

 desirable selective cutting. 



The reduction in saw-timber areas would be most noticeable in the 

 Lake, Central, and Pacific Coast regions. The reduction in saw- 

 timber volume would be very largely in the Pacific Coast region. 

 Actual depletion, however, would be most severe in the Lake and 

 Central regions where the supplies of softwood saw timber would 

 be practically exhausted. This means that in these two regions 

 paucity of supply would force a still greater reduction in saw-timber 

 drain than that assumed in this calculation. 



