ry em 
RES 
_ Comparison of Growth and Drain 
5 ASED on the saw-timber growing stock (pine- 
ee cypress 9.0 inches d. b. h. and larger, and hard- 
woods 13.0 inches d. b. h. and larger), growth 
for the State amounted in 1937 to 3% billion board feet 
(table 27) and drain (industrial and domestic use and 
. mortality) to 2 billion board feet, resulting in a net in- 
_ crease in the growing stock of 843 million feet. A detailed 
statement by survey units and kind of timber for 1936-37, 
and in part for 1934-35, is given in table 54 in the 
_ appendix. Regarding the growth-drain situation in the 
saw-timber part of the stand, it must be realized that 
_ where the annual drain exceeds the growth or even where 
__ there is an apparent balance, the effect is inevitably to de- 
crease the size and quality of the trees that compose the 
_ - basic growing stock. If this concentration of lumber cut on 
the larger and better trees is continued long enough, it may 
eventually so lower the yield of sawmill material as to force 
many mills out of business. The deteriorating effect of 
the overdraft of present forest industries upon the larger 
‘ and better trees is shown by the fact that while in south 
_ Georgia the saw-timber portion of the stand decreased, 
_ the total growing stock, including trees as small as 5.0 
inches d. b. h., showed a surplus of growth over drain. 
In 1937, on the basis of total growing stock (i. e., 
as small as 5.0 inches d. b. h., 
size), the growth for the State amounted to 930 million 
cubic feet, inside bark; the drain from all sources was 691 
. million cubic feet, leaving the growing stock increased by 
239 million cubic feet (table 28). The growth and drain, 
expressed in standard cords, bark included, in the different 
_ survey units are shown in figure 15, and presented in detail 
in appendix table 55. 
Notwithstanding the large amount of material that is 
apparently available to expand industrial activity in the 
near future, it would be to the lasting advantage of the 
trees 
as well as those of saw-timber 
The Future Timber Supply for Wood- “Using — 
Industries 
$$ «e 
Tasre 27.—Comparison of net increment with utilization drain in saw- 
timber material, 1937 ' 
SOUTH GEORGIA UNITS 
Hardwoods! 
Pines and cypress 
Item All species 
M board feet M board feet | M board feet 
Growing stock, Jan. 1, 1937______- 12, 632,600 | 5,808,500) 18, 441, 100 
Growth} we 0 2s oS 981, 700 255,000 | 1, 236, 700 
WMiGrfalitys tee Pe 514, 300 | 75, 900 590, 200 
Wetbncrement>__-=>---* ==... --<- 467,400 | 179, 100 | 646, 500 
Commodity drain__.--.........-- 521, 300 | 216, 200 737, 300 
Net Glinnipey es a. Soo eee — 53,900 | —37, 100 —91, 000 
oe SSS SS====z 
Growing stock, Jan. 1, 1938_____ 12, 578, 700 5, 771, 400 18, 350, 100 
CENTRAL, NORTH-CENTRAL, AND NORTH GEORGIA UNITS 
Growing stock, Jan. 1, 1937_____- | 20,418,600 | 7,735,700 | 28, 154, 300 
——E—E ES eS eee 
Gibwihae sos ne fae 1,674,300 | 452,700 | 2, 127, 000 
ON) 5 Ae ee ae ela 188, 700 82, 700 271, 400 
Net:increment....--......-...--. 1, 485, 600 370, 000 1, 855, 600 
Commodity drain__--__..----- . 709, 200 212, 600 921, SOO 
Net change 776, 400 157, 400 933, S00 
Growing stock, Jan. 1, 1938. 21, 195, 000 7, 893, 100 29, OSS, 100 
ALL UNITS 
Growing stock, Jan, 1, 1937 33,051,200 13, 444, 200 ae 400 
Growth____- 2, 656, 000 707, 700 6S, TO 
Mortality ___- ; 708, 000 158, 600 N 
LES 
Net increment : Se ali | 1,953, 000 Sg, 10 
Commodity drain 1, 230, 500 | As 
Net change i 722, 30 
Growing stock, Jan. 1, 1938 | 33, 773, 700 
1 Lumber tally. Similar figures for period f& 
1938, given in table M4, appendix 
