turpentine pines do not put on sufficient growth 

 annually to offset the losses due to fire, wind-throw, 

 and other causes; this accounts for the negative 

 rate of increment in such stands. During 1934 the 

 loss in increment of longleaf and slash pines at- 

 tributable to turpentining was as great as the drain 

 on all species of pine for the production of wood 

 products (table 19). 



Table 19. — Loss in increment due to turpentining of longleaf and 

 slash pines, 1934 



Effect 



Board-foot 

 volume i 



Cubic-foot 

 volume 2 



Growth if left round _ _ __ 



M board feet 

 236, 200 

 122, 600 



M cubic feet 

 35, 500 





21, 180 







Loss in growth . 



113.600 



14, 320 



Mortality if left round _ _ 



113, 100 

 187, 200 



26, 580 



Mort lity when turpentined 



52. 890 









74, 100 



2fi, 310 







Unusable volume.— . 



22, 600 



1, 560 







Total loss 



210. 300 



42, 190 







1 International 5-4 -inch rule. 



J Cubic-foot figures are for solid wood inside bark. 



Both in and out of the turpentine woods, the 

 almost universal practice of uncontrolled woods 

 burning has had a markedly unfavorable effect 

 on the increment of the stands, and one that 

 reaches back for many decades. This is due not 

 only to a slowing down of the growth rate of the 

 individual trees but also to the prevention of any 

 approach to full stocking. If the effects of this 

 factor, together with those of destructive turpen- 

 tining, wind-throw, natural crowding out, and 

 other causes of tree mortality, could be lessened 

 appreciably, important increases could be made 

 in the net increment. These factors reduced net 

 increment for all species nearly 400 million board 

 feet (International %-inch rule) in 1934, almost 

 as great a reduction as the utilization of all wood 

 products combined. This tremendous waste can 

 be materially lessened with more attention to 

 good forest management, adequate control of fire, 

 conservative turpentining, thinning of dense stands, 

 and more complete utilization. 



NET INCREMENT FOR THE ENTIRE SURVEY 

 UNIT 



The increment figures given in table 20 are an 

 estimate of the net increases (growth less mortality) 

 taking place in the stands during 1934. The 



board-foot figures represent net increases in the 

 volume of saw-timber material only; the cubic- 

 foot figures include all good trees 5 inches in diame- 

 ter and above. The influence of turpentining is 

 reflected in the minus increment for turpentined 

 pines. 



Table 20. — Total net increment, classified according to forest 

 condition and species group 



BOARD-FOOT INCREMENT! (INTERNATIONAL 

 J4TNCH RULE) 



Forest condition 



Turpentine 

 pine 



Non- 

 turpen- 

 tine 

 pine 



Hard- 

 wood 



Cy- 

 press 



All 



Round 



Turpen- 

 tined 



species 

 groups 



Old growth 



M 



board 



feet 



-13,000 



107, 400 

 73, 400 



4,000 



M 



board 



feet 



-65, 800 



-17,800 

 -700 



-2, 700 



M 



board 

 feet 

 7,000 



35, 300 

 10, 800 



( ! ) 



M 

 board 

 feet 

 46,900 



16, 300 

 4,800 



( 2 ) 



board 

 feet 

 9,500 



7,000 

 800 



-100 



M 



board 



feet 



-15, 400 



148, 200 

 89, 100 



1 200 



Second growth: 



Sawlogsize 



Under sawlog si ze. 



Reproduction and 

 clear-cut.. 







Total 



171, 800 



-87, 000 



53, 100 



68, 000 



17, 200 



223, 100 



CUBIC-FOOT INCREMENT > (INSIDE 



BARK) 





Old growth.. __ _ _ 

 Second growth: 



Sawlogsize. 



Under sawlog size- 

 Reproduction and 



M 



cubic 

 feet 

 -5, 010 



20, 320 

 30, 410 



110 



'M 



cubic 



feet 



-15,320 



-11, 240 

 -5, 390 



-1,300 



M 



cubic 

 feet 

 1,030 



5,890 

 3,120 



80 



M 



cubic 

 fset 

 9,080 



6,180 

 5,790 



10 



AT 

 cubic 

 feet 



1,240 



2,240 

 970 



20 



M 



cubic 

 feet 

 -8, 980 



23, 390 

 34, 900 



-1,080 







Total 



45, 830 



-33, 250 



10, 120 



21, 060 



4,470 



48, 230 



1 Minus sign (— ) indicates loss. 



2 Negligible. 



The growing interest in better forest manage- 

 ment, the spread of the use of fire-protection 

 measures, and the opening of markets for material 

 formerly unutilized, lend color to the belief that 

 the annual increment can be doubled in a -few 

 decades if these movements grow to the extent 

 that now seems possible. 



Wood-Products Industries 



In northeastern Florida the manufacture of 

 lumber is the most important of the wood-products 

 industries; cross- tie production ranks second; the 

 making' of veneer, third; and the cooperage indus- 

 try, fourth. The larger sawmills are found prin- 

 cipally in the rapidly disappearing old growth of 

 Taylor, Dixie, and Levy Counties on the Gulf 

 coast; the veneer industry is located within and 



34 



