



i 

COASTAL PLAIN PIEDMONT 









SOFTWOODS SOFT HARD 
HARDWOODS HARDWOODS 
ieee DRAIN INTENSITY 

SOFTWOODS SOFT HARD 
HARDWOODS HARDWOODS 
Hf, sROWTH RATIO 


FIGURE 44.— Cords of growth and drain per thousand cords of 
pole-timber growing stock, by region and species group, 1946, 
difference in growth ratios between the two regions 1s 
even greater among the soft hardwoods. These species 
grow only 2 cords compared to 34 cords in the Piedmont. 
Only the hard hardwoods show a favorable growth 



ratio, but even their rate of 27 cords is not enough to 
offset the correspondingly high intensity of drain. 
Net pole-timber growth depends upon (1) the rate 
at which individual trees are growing, (2) the rate at 
which saplings are growing into pole timber, and (3) 
the rate at which pole timber is moving into saw-timber 
sizes. Pole-timber growing stock represents but a middle 
stage in the process of growing trees from seedlings to 
saw timber. During the growth period, saplings grow 
into pole size and add their volume to the growth of 
trees already pole-timber size. At the same time, some 
pole trees grow to saw-timber size, diminishing the 
pole-timber growing stock by their volume. Net pole- 
timber growth, then, is obtained by subtracting out- 
growth and mortality from the sum of ingrowth and 
growth on pole-size trees (fig. 45). 
The growth rate of individual trees differs little 
between the Coastal Plain and the Piedmont. Yet, net 
growth in the Coastal Plain, in all species combined, is 
but a third of that in the Piedmont. 
Low net growth in the Coastal Plain can be traced 
to a low ingrowth of saplings and a rapid outgrowth 




COASTAL PLAIN 
~“ 
ae 
CUBIC FEET 
o 
oO 
NS 
sane 

WD 
Wh WU 
FIGURE 45.— Components of 
net pole-timber growth, in 
terms of cubic feet per 
thousand cubic feet of pole- 
timber growing stock, 1946. 

PIEDMONT 

CUBIC FEET 


fi 
INGROWTH + GROWTH 
FROM ON TO 

— OUTGROWTH — MORTALITY = NET 
GROWTH 
SAPLINGS POLE TIMBER SAW TIMBER 
eee SOFTWOODS 
Timber Supply Outlook in South Carolina 35 
\ 
Y HARDWOODS 

