INCREMENT 





MORTALITY DRAIN 

 COMMODITY DRAIN 



CHANGE IN 

 GROWING STOCK 



Figure 42. — Comparison, in cords, of increment with 

 mortality and commodity drain in the Coastal Plain, 

 piedmont, and mountains, 1938. 



trees. They can be obtained bv leaving more seed trees, 

 by planting, and especially by more intensive fire protec- 

 tion. 



Table 33.- — Change in growing stock, by forest condition and diameter 

 group, 1938 





Second growth 





Species group and diameter Old 

 class (inches) growth 



Sawlog 

 size 



Under 



sawlog 



size 



All condi- 

 tions 



Softwoods: 



5-8.9 



1.000 

 cubic 

 feet 



-1.890 

 -43. 4(50 



1,000 

 cubic 

 feet 



—52,040 



-10.080 



1.000 

 cubic 

 feet 



42, 970 

 57,340 



1.000 

 cubic 

 feet 



-10.960 





3,800 







Total _-- 



—45. 350 



-62, 120 



100, 310 



-7,160 







Hardwoods: 



5-12.9 .. 



9.310 

 -9, 380 



21,160 

 17, 090 



27, 190 

 16, 130 



57.660 





23.840 







Total -.- 



-70 



38, 250 



43. 320 



81, 500 









-45, 420 



-23, 870 



143, 030 



74. 340 







The aggressive and less-utilized hardwoods increased 

 by 81 million cubic feet. The greatest volume increase was 

 in trees less than 13 inches in diameter, but the sawlog-size 

 trees increased appreciably in all but the old-growth 

 stands of the Coastal Plain and mountains, where there 

 were an increase of only 1.6 and a reduction of 7 million 

 cubic feet, respectively. 



In the Coastal Plain the softwoods increased by 79,000 

 cords, chiefly in sawlog-size trees. Hardwoods increased 

 in all forest conditions, although most of the gain of 

 463,000 cords was in second-growth saw timber. Soft- 

 woods in the piedmont decreased in the saw-timber stands 

 and increased in the younger stands, resulting in a net 

 deficit of 264,000 cords. Hardwoods increased in all 

 classes of timber, but most of the gain was in under- 

 sawlog-size stands. Although old-growth softwoods in 

 the mountains decreased by 88,000 cords, second-growth 

 stands increased by four times as great a volume. Most 

 of the increase was in small, immature trees, however, 

 that will not take the place of the older, merchantable 

 timber for several decades. 



54 



