Average Wood Production in United States. 



383 



compared, are not nearly normally stocked — the redwoods of 

 California being exceptional. This deficiency of stocking in the 

 best virgin forest is expressed by a percentage in column 2 of 

 the above table. Column 3 gives the estimated relation between 

 the immature or growing forest and the best virgin tracts. Here 

 the percentage for the central and southern hardwoods is placed 

 at 60, in order to allow for the large number of mature trees 

 still in these culled forests. The density, including these mature 

 non-producing trees, would of course be much higher than 60 

 per cent, of the virgin forest density. 



By multiplying the production in the fully stocked forest 

 (Table 14) by the percentages of effective stocking in virgin 

 and growing forests successively, the last column of that table 

 is secured, indicating a production of from 21 to 56 cubic feet 

 per acre per year in the immature forest in all regions except the 

 Rocky Mountain region, where the large area of juniper, pifion, 

 and scrub oak woodland included in the total wooded area re- 

 duces an already low average growth to approximately 9 cubic 

 feet. These figures are believed to be, if anything, higher than 

 the truth. 



Applying this estimated average growth to the area of grow- 

 ing forest — 



Table XV. 



Probable area 

 of growing 

 forest and 

 woodland. 



Estimated 

 growth 

 per acre. 



Estimated 



total 

 production. 



Lake States, 



Northeastern States, . . , 



Central States, 



Southern States : 



Pine land 



Hard-wood land, . . 

 Rocky Mountain States, 

 Pacific Coast States, . . 



Total, 



Acres. 

 27,000,000 

 38,000,000 

 54,000.000 



50,000,000 

 41,000,000 

 17,000,000 

 13,000,000 



Cubic feet. 

 38 

 33 

 25 



Cubic 

 1,026 

 1,254 

 1.35° 



1,189 

 153 



728 



feet. 



000,000 

 000,000 

 000,000 



000,000 



ooo,coo 



000,000 

 000,000 



240,000,000 



6,750,000,000 



a Average. 



an estimated total production of about 6,700,000,000 cubic feet 

 is indicated. This is an average of about 28 cubic feet per acre 

 for the estimated 240,000,000 acres of growing forest and wood- 

 land, or about 12 cubic feet for the entire forest and woodland 



