Figure 43. — Gross and net growth in board feet. 

 International }/^-inch rule, by species groups and 

 survey units, 1936. 



Table 23. — Average annual gross growth, mortality, and net growth 

 during the 5~year period 1936-40 



Table 24. — Net growth. International ^/^-inch rule, of the saw- 

 timber stand and all sound trees, by condition classes, 1936 





Sa\ 



log-size 



trees 





All trees 



. 





Pines 



Hard- 

 woods 



All 

 species 



Pines 



Hard- 

 woods 



All 

 species 



State: 



Gross growth 



Million 



board 



Uet 



1,22SA 



Million 

 board 

 fen 

 522.1 



Million 



board 



feet 



1,747.5 



MUlion 

 cubic 

 feet 



293.33 



Million 

 cubic 

 feet 

 171.71 



Million 

 cubic 

 feet 

 465.04 



, Mortality 



191.5 



118.6 



310.1 



55.37 



49.21 



104.58 



Net growth 



1.033.9 



403.5 



1.437.4 



237.96 



122.50 



360.46 



Southern Coastal Plain: 















Gross growth 



329.0 



171.2 



500.2 



74.07 



58.73 



132.80 



Mortality :_ 



85.4 



41.0 



126.4 



22.66 



19.19 



41.85 



Net growth 



243.6 



130.2 



373.8 



51.41 



39.54 



90.95 



Northern Coastal Plain: 















Gross growth 



534.8 



250.2 



785.0 



107.75 



71.01 



178.76 



Mortality 



67.6 



62.9 



130.5 



16.57 



23.55 



40.12 



Net growth 



467.2 



187.3 



654.5 



91.18 



47.46 



138.64 



Piedmont: 















Gross growth 



361.6 



100.7 



462.3 



111.51 



41.97 



153.48 



Mortality 



38.5 



14.7 



53.2 



16.14 



6.47 



22.61 



Net growth 



323.1 



86.0 



409.1 



95.37 



35.50 



130.87 



Condkion class 



Saw-timber 



tand 



All sound trees 



Pine 



Hard- 

 wood 



Total 



Pine 



Hard- Total 

 wood 



Sawlogsize:' 



Old growth 



Second growth__._ 



Under-sawlog size... 



Million 

 board 

 feet 

 60.400 

 697,700 

 217.900 



Million 

 board 

 feet 

 157,900 

 209,800 

 36,900 



Million 

 board 

 feet 

 218,300 

 907,500 

 254,800 



cubic 

 feet 

 11,240 

 135,670 

 78,490 



cubic cubic 

 feet feet 

 29,190 40,430 

 61,680 197,350 

 29,080 107.570 



Total 



"'■°°° 



404,600 



1,380,600 



225,400 



119,950 345,350 



All sound trees 5 inches d. b. h. and larger (inside bark). 



Growth in Board Feet 



During the period 1936-40 South Carolina's saw- 

 timber stand grew at an average gross rate of about 

 1.7 billion board feet per year. Almost a fifth of 

 the volume was lost through mortality, leaving a 

 net growth of about 1.4 billion board feet. About 

 72 percent of this increment was in pine and 28 per- 

 cent in. hardwoods. 



For the State as a whole, mortality was propor- 

 tionately higher for hardwoods (23 percent) than for 

 pines (16 percent), but the heaviest losses (26 per- 

 cent) were in the pine stands of the southern Coastal 

 Plain. This heavy mortality may be attributed 

 chiefly to frequent fires and to naval stores opera- 

 tions in the longleaf and slash pine stands. Consid- 

 erable reduction in mortality may be expected as 

 organized fire control is further developed and ex- 



