Table 1.1 - Ratio of total volume1to merchantable volume2
Above-ground ratio3 Below-ground proportion4 Ratio5
Region Softwood Hardwood Softwood Hardwood Softwood Hardwood
Southeast 1.408 1.793 0.163 0.197 1.682 2.233
South Central 1.495 2.304 0.163 0.197 0.786 0.869
Northeast 1.82 1.808 0.170 0.155 2.193 2.14
Mid Atlantic 1.82 1.808 0.170 0.155 2.193 2.14
North Central 2.087 2.043 0.170 0.155 2.514 2.418
Central 2.159 2.24 0.170 0.155 2.601 2.651
Rocky Mountain 1.898 1.871 0.158 0.155 2.254 2.214
Pacific Coast 1.41 1.926 0.158 0.155 1.675 2.279

1 Volume of all above- and below-ground tree biomas foliage, bark, roots, and root bark.
2 The gross volume of the central stem from a 1-foot stump to a minimum 4.0 inch top diameter outside bark, or to the point where the central stem breaks into limbs; less deductions for rot, roughness, or poor form; for live trees of commercial species at least 5.0 inches d.b.h., and meeting specified standards of quality.
3 The ratio of total above-ground tree biomass to merchantable tree biomass from Cost and others (1990) and other Forest Service reports.
4 The proportion of total above- and below-ground biomass below the ground (Koch 1989).
5 The ratio of total volume to merchantable volume = data column 1 or 2 adjusted for the below-ground proportions (eg., col. 5 = col.1 divided by [1 - col. 3].