the cut of shingle and small-dimension mills, 

 amounted to approximately 43,000 cords, resulting 

 in a drain of 3.5 million cubic feet. The drain 

 caused by land clearing averages slightly more than 

 700,000 cubic feet annually. 



Comparison of Increment With Commodity 

 Drain 



The growth and drain data given in previous 

 sections have been reassembled here in order that 

 that they may be compared and their net influence 

 upon the growing stock of the area considered. 

 The inventory data previously given were based on 

 field work in 1934. Changes produced by growth, 

 mortality, turpentining, and commodity drain indi- 

 cate that during 1934 and 1935 the pine saw- 

 timber increment exceeded the drain, thereby 

 increasing the growing stock; but because of the 

 increased forest-industry activity in 1936, the pine 

 saw-timber drain exceeded the increment, re- 

 ducing the growing stock by more than 35 million 

 board feet (table 25). 



Table 25. — Change in growing stock, 7934-37 

 IN BOARD FEET (LUMBER TALLY) 



Table 26. — Comparison of increment with commodity drain, 1936 

 IN BOARD FEET, LUMBER TALLY 



Item 



Pine 



Hard- 

 wood 



Cy- 

 . press 



All 

 species 



Growing stock, Jan. 1, 1934„. 

 Change in growing stock. 



M board 

 jeet 

 ' 12, 625, 500 

 22,100 



M board 



jeet 

 4, 910, 900 

 38,000 



M board 



jeet 



1, 033, 200 



-89,900 



M board 

 jeet 

 1 18, 569, 600 

 -29,800 



Growing stock, Jan. 1, 1935- - 

 Change in growing stock. 



12, 647, 600 

 20,500 



4, 948, 900 

 33, 700 



943, 300 

 -83,300 



18, 539, 800 

 -29,100 



Growing stock, Jan. 1, 1936- - 

 Change in growing stock. 



12, 668, 100 

 -35, 500 



4, 982, 600 

 23, 400 



860, 000 

 -57, 500 



18, 510, 700 

 -69,600 



Growing stock, Jan. 1, 1937.. 



12, 632, 600 



5, 006, 000 



802, 500 



18, 441, 100 



IN CUBIC FEET (INSIDE BARK) 



Growing stock, Jan. 1, 1934_. 

 Change in growing stock. 



M cubic 



Jeet 

 2 4, 070, 480 

 -10,370 



M cubic 



feet 

 1, 914, 180 

 33, 930 



M cubic 



feet 



312, 960 

 -12,770 



M cubic 



feet 

 2 6, 297, 620 

 10,790 



Growing stock, Jan. 1, 1935-- 

 Change in growing stock- 



4, 060, 110 

 -7,010 



1, 948, 110 

 35, 620 



300, 190 

 —11, 870 



6, 308, 410 

 16, 740 



Growing stock, Jan. 1, 1936.- 

 Change in growing stock. 



4, 053, 100 

 -15,620 



1, 983, 730 

 34, 550 



288,320 

 -7,920 



6, 325, 150 

 11.010 



Growing stock, Jan. 1, 1937.- 



4, 037, 480 



2, 018, 280 



280, 400 



6, 336, 160 



' Includes 49,900 M board feet in the butts of newly cupped trees not 

 shown in the inventory summarized in tables 13, 14, and 15. 



2 Includes 5,630 M cubic feet in the butts of newly cupped trees not 

 shown in the inventory summarized in table 17. 



Item 



Pine 



Hard- 

 wood 



Cy- 

 press 



All 

 species 



Growing stock, Jan. 1, 1936 



M board 

 feet 



12, 668, 100 



M board 

 feet 



4, 982, 600 



M 



board 



feet 



860, 000 



M board 

 Jeet 



18, 510, 700 



Growth. 



1, 015, 800 



233,300 



21,300 



1, 270, 400 





Mortality 



Loss in butt volume (with- 

 drawn for naval stores) - 



515, 400 

 41,500 



69, 100 



7,000 



591, 500 

 41,500 











Total loss... 



556, 900 



69,100 



7,000 



633, 000 







Net increment. 



458,900 

 494, 400 



164, 200 

 140, 800 



14, 300 

 71,800 



637, 400 





707,000 





Net change in growing 

 stock ... 



-35, 500 



23,400 



-57, 500 



-69, 600 



Growing stock, Jan. 1, 1937 



12, 632, 600 



5, 006, 000 



802, 500 



18, 441, 100 



IN CUBIC FEET (INSIDE BARK) 



Growing stock, Jan, 1, 1936 



M cubic 



feet 

 4, 053, 100 



M cubic 



fed 

 1, 983, 730 



Mcubic 



Jeet 

 288, 320 



M cubic 



jeet 

 6, 325, 150 



Growth 



254,920 



92, 470 



5,880 



353, 270 





Mortality ... 



Loss in butt volume (with- 

 drawn for naval stores) 



152, 730 



4,090 



34, 020 



2,890 



189,640 

 4,090 













156, 820 



34, 020 



2,890 



193, 730 







98, 100 

 113, 720 



58, 450 

 23, 900 



2,990 

 10, 910 



159, 540 

 148, 530 







Net change in growing 

 stock 



-15,620 



34, 550 



-7,920 



11,010 



Growing stock, Jan. 1, 1937 



4, 037, 480 



2, 018, 280 



280, 400 



6, 336, 160 



In the hardwood stands increment exceeded the 

 drain during each of the 3 years analyzed, but the 

 cut was from the more valuable species and sizes 

 and the major portion of the increment occurred 

 on younger, second-growth timber of low value 

 and on less-desirable species. Cypress drain ex- 

 ceeded increment each of the years studied and 

 caused a reduction in growing stock of more than 

 230 million board feet between January 1, 1934, 

 and January 1, 1937. 



For all species-groups combined, the growing 

 stock was reduced more than 29 million board 

 feet per year during 1934 and 1935. In 1936 the 

 decrease in growing stock amounted to almost 70 

 million board feet. Although the pine and cypress 

 growing stock shows a decrease in cubic-foot 



47 



