Table 7. — Net volume in Doyle rule classified according to species group and forest condition 





Old growth 



Second growth 



All forest co 





Species group 



Uncut 



Partly cut 



Sawlog size 



Under saw- 

 log size ' 



editions 





Uncut 



Partly cut 





Pines: 



M board feet 

 195, 000 

 290, 600 

 692, 200 



A/ board feet 

 264, 200 

 121, 300 

 229, 600 



M board feet 



191, 300 



1,134,500 



2, 963, 400 



M board feet 

 34, 700 

 278, 800 

 505, 300 



M board feet 

 41, 400 

 58, 400 

 91, 800 



M board feet 



726, 600 



1, 883, 600 



4, 482, 300 



Percent 

 5.9 





15.4 



Loblolly - - - . 



30.6 







Total .-- - 



1, 177, 800 



615, 100 



4, 289, 200 



818, 800 



191, 600 



7, 092, 500 



57.9 







Hardwoods: 



348, 000 

 171, 800 

 408, 300 

 318, 600 

 42, 500 

 341, 200 



188, 000 

 133, 600 

 268, 500 

 220, 300 

 23, 500 

 243, 200 



347, 100 

 203, 800 

 538, 300 

 376, 600 

 42, 400 

 2x4, SI III 



100, 900 

 42, 600 

 177, 700 

 130, 300 

 6,700 

 82, 400 



27, 200 

 6,800 

 31, 400 



24, 300 

 2,700 



25, 400 



1,011,200 



558, 600 



1,424,200 



1, 070, 100 



117, 800 



977, 000 



8.2 





4.6 





11.6 





8.7 



Ash 



1.0 



Other hardwoods _. . ._ 



8.0 







Total. _ -.. - 



1, 630, 400 



1,077,100 



1, 793, 000 



540, 600 



117,800 



5, 158, 900 



42.1 









2, 808, 200 



1 Percent 

 1 22.9 



1, 692, 200 



Percent 

 13.8 



6, 082, 200 



Percent 

 49.7 



1. 359, 400 



Percent 

 11.1 



309, 400 



Percent 



2 5 



12, 251, 400 





All species. __ . 



100 









1 Includes uncut, partly cut, reproduction, and clear-cut. 



Hardwood species contain 42 percent of the total 

 board-foot volume, or more than 5 billion feet. 

 Red gum, red oaks, and white oaks, with over 1 

 billion board feet each, make up two-thirds of this 

 volume. 



Of the volume in the various forest conditions, 

 97.5 percent, or nearly 12 billion board feet, is in 

 sawlog-size stands, and these occupy 67.5 percent 

 of the forest area. They have an average volume 

 of 2,680 board feet per acre. Second-growth saw- 

 log-size stands contain nearly 7% billion board feet, 

 or 61 percent of the total volume. The uncut 

 stands of this condition average 2,440 board feet 

 per acre, and the partly cut stands 1,520 board 

 feet. The combined volume of old-growth stands 

 amounts to about 37 percent of the total volume 

 in the unit. Old-growth uncut stands average 

 5,560 board feet per acre, and partly cut stands 

 3,000 board feet. 



Owing to the topography, continuous working 

 seasons, and cheap transportation to the mill, 

 virtually all parts of the unit can be logged. Of 

 the total volume of saw timber, over 86 percent 

 is in stands of 600 feet or more per acre and under 

 prevailing market conditions could be operated at 

 a profit. In addition, 11 percent is in partly cut 

 second-growth sawlog-size stands, with a mini- 



mum volume in 1935 of 400 feet per acre; the 

 average pine increment per acre of these stands in 

 1935 was nearly 160 board feet. 



In table 8, the board-foot volume of pine and 

 hardwood is shown in the several diameter classes 

 and forest conditions. More than half of the pine 

 volume is in the 10- to 16-inch diameter classes. 

 The hardwood volume is about equally divided 

 between trees 20 inches d. b. h. and larger, which 

 include most of the highest grade material, and 

 trees below 20 inches, containing most of the lower 

 grade material. In the pines there are about \)'i 

 billion board feet in the old-growth condition in 

 trees 14 inches d. b. h. and larger, in which is 

 found the bulk of the high-grade pine saw timber 

 and 22 percent of the total pine saw timber. 

 Hardwoods at least 20 inches d. b. h. in the old- 

 growth condition contain a volume of 1% billion 

 feet, or 35 percent of the total hardwood volume. 



To obtain a better concept of the general quality 

 of the timber, 4,000 representative sample trees 

 were graded. The merchantable pine trees were 

 graded on a tree basis and were classified as to 

 general grade (smooth, limby, or rough). The 

 hardwoods were handled by individual logs, and 

 each log was assigned to grade 1, 2, or 3, depending 

 upon its quality (see description of grades, p. v). 



i7 



