million cubic feet for the 5 years, or about 27 million 

 cubic feet (roughly 335,000 cords) per year. This 

 indicates an active growth of young hardwood 

 stands of less than saw-timber size (5 to 13 inches 

 d. b. h.). 



Table 28. — Influence of growth, mortality, and commodity drain 



upon the growing stock in South Carolina during the 5-year 



period 1936-40 



SAWLOG-SIZE TREES i 



Item 



Pines 



Hardwoods 



All species 



Growing stock, Jan. 1, 1936 



Million 

 board feet 

 18.430.0 



Million 

 boardfeet 

 11.687.1 



Million 

 boardfeet 

 30.117.1 



Gross growth, 1936-40 



Mortality, 1936-40 



6,127.1 

 — 9S7.S 



2.610.7 

 —593.4 



8.737.8 

 —1,550.9 



Net growth, 1936-40 



Commodity drain, 1936-40 



5.169.6 

 — 4.459. S 



2,017.3 

 -2,089.7 



7.186.9 

 —6.549.2 



Net change 



710.1 



-^72.4 



637.7 



Growing stock, Dec. 31, 1940 



19.140.1 



Percent 

 + 3.9 



+ .8 



11.614.7 



Percent 

 -0.6 



30,754.8 



Percent 

 + 2.1 





+ .-t 







ALL TREKS ■ 



Growing stock, Jan. 1,1936 .__. 



Million 

 cubic feet 

 4,796.68 



Million 

 cubic feet 

 3,824.28 



Million 

 cubicfeet 

 8.620.96 



Gross growth, 1936-40 



Mortality, 1936-40 



1,466.64 

 —276.81 



858.58 

 —246.08 



2,325.22 

 —522.89 







Net growth, 1936-40 



Commodity drain, 1936-40 



1. 189. 83 

 —1.056.29 



612.50 

 —478.46 



1.802.33 

 -1,534.75 



Net change 



133.54 



134.04 



267.58 







Growing stock, Dec. 31, 1940 



4.930.22 



3.958.32 



8.888.54 



Change in 5 years 



Percent 

 + 2.8 

 + .6 



Percent 



+ 3.5 

 + .7 



Percent 

 + ' 1 





+ .6 







1 International J^-inch rule. 



^ Sound trees 5 inches d. b. h. and larger, inside bark. 



While the relation of growth and drain to the 

 growing stock for the State is important, comparable 

 information for smaller areas is needed. Unfortu- 

 nately the computations do not permit of compari- 

 sons for regions smaller than the survey units. For 

 the units the relation of average increment in board 

 feet to commodity drain is illustrated in figure 44 for 



the years 1936-40; and the average growth sur- 

 pluses and deficits for the same period are shown in 

 tables 27, and 29, and 35, 36, 37, and 38. 



It is evident that the piedmont has the largest 

 growth surplus of saw timber, both pine and hard- 

 wood. The State-wide deficit of hardwood saw 

 timber is due to a sizeable deficit on the northern 

 Coastal Plain; on the southern Coastal Plain and 

 the piedmont there are actual surpluses. The pied- 

 mont leads in growth surpluses of pines 5 inches 

 d. b. h. and larger, while the northern Coastal Plain 

 shows deficits in both pine and hardwoods of this 

 class (table 29). In general, the relation of growth 

 to drain is most favorable on the piedmont and least 

 favorable on the northern Coastal Plain. 



Table 29. — Average annual net growth and commodity drain, by 

 regions, during the 5-year period 1936—40 

 SAWLOG-SIZE TREES • 





Region 







Pines 





H 



ardwood 



s 







Com- 



Growth 





Com- 



Growth 









Net 



modity 



surplus 



Net 



modity 



surplus 









growth 



drain 



or 

 deficit 



growth 



drain 



deficit 









Million 



Million 



Million 



Million 



Million 



Million 









bd.ft. 



bd.ft. 



bd.ft. 1 bd.ft. 



bd. ft. 



bd.ft. 



Southe 



n Coast 



al Plain 



243.6 



230.3 



13.3 



130.2 



109.0 



21.2 



Northe 



rn Coast 



al Plain 



467.2 



434.4 



32.8 



187.3 



249.1 



—61.8 



Piedmc 



nt 





323.1 



227.2 



95.9 



86.0 



59.9 



26.1 



All r 



1.033.9 



891.9 



1+2.0 



403.5 



41S.0 



-14.5 



ALL trees: 







Million 



Million 



Million 



Million 



Million 



Million 







cubic 



cubic 



cubic 



cubic 



cubic 



cubic 







feet 



feet 



feet 



feet 



feet 



feet 



Southern Coas 



tal Plain 



51.42 



48.47 



2.95 



39.54 



19.37 



20.17 



Northern Coa 



tal Plain 



91.17 



99.17 



—8.00 



47.46 



52.82 



-5.36 



Piedmont. .__ 





95.38 



63.62 



31.76 



35.50 



23.50 



12.00 



All regions. 



237.97 



211.26 



26.71 



122.50 



95.69 



26.81 



^ International l^-inch rule. 



^ Sound trees 5 inches d. b. h. and larger, inside bark. 



An ample yearly excess of growth over drain will 

 increase the density of timber stands, allowing more 

 timber of better quality to mature. The need for 

 this is greatest on the piedmont because here the 

 timber is generally of lower quality than that on the 

 Coastal Plain. In fact, any significant expansion of 



52 



