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Figure 16.34--Volume of softwood growing stock on timberland by stand origin and diameter class, Southern United States, 1999.

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Volume in billion cubic feet by diameter class (in inches) for artificial and natural stand origins:

Diameter-class	Artificial	Natural
5.0-6.9	5.726	5.621
7.0-8.9	7.088	9.785
9.0-10.9	4.941	12.295
11.0-12.9	3.023	13.501
13.0-14.9	1.758	12.442
15.0-16.9	0.964	9.996
17.0-18.9	0.484	6.800
19.0-20.9	0.207	4.426
21.0-28.9	0.157	5.596
29+	0.006	0.703