Forest-Based Biomass Basic Computations - Mathematics and Statistics for the Environment - page 337

■ EXAMPLE 13.2
Problem: Calculate the basal area (in ft 2 ) for a tree measuring 6 in. DBH.

Solution:

2 2

π( DBH) 3146

4

. × 113 04 .

ft 2 Basalarea = = = = . 0 19625

4 × 144 × 144 576

13.4.3 W ood d ensity and W eight r atios
The weight (lb) per cubic foot of any tree species may be computed by using the moisture content
and specific gravity (based on oven-dry weight and green volume):

%Moisturec ontent

DensitySpecificgravity = × 62.4 1 + (13.12)

100

■ EXAMPLE 13.3
Problem: Determine the volume (ft 3 ) contained in the following wood weight, given that the weight,
specific gravity, and moisture content of the wood, respectively, are 15,530 lb, 0.53, 100%.

Solution:

%Moisturec ontent

DensitySpecificgravity = × 62.4 1 +

100

100
100

=

3

=× + 053624 1 . . 33 07 ×= 2661 . lb/ft

lb
66.1 lb/f

15 530 ,

3

Volume = = 234 . ft

3

t

REFERENCES AND RECOMMENDED READING
Avery, T.E. and Burkhart, H.E. (2002). Forest Measurements , 5th ed. McGraw-Hill, New York.
Brenneman, B.B., Frederick, D.J., Gardner, W.E., Schoenhofen, L.H., and Marsh, P.L. (1978). Biomass of spe-
cies and stands of West Virginia hardwoods, in Pope, P.E., Ed., Proceedings of Central Hardwood Forest
Conference II , November 14-16, 1978, Purdue University, West Lafayette, IN.
Bonhan, C.D. (1989). Measurements for Terrestrial Vegetation . John Wiley & Sons, New York.
Bridge, J.A. (1979). Fuelwood Production of Mixed Hardwoods on Mesic Sites in Rhode Island, master's the-
sis, University of Rhode Island, Kingston.
Briggs, D. (1994). Forest Products Measurements and Conversion Factors: With Special Emphasis on the U.S.
Pacific Northwest . College of Forest Resources University of Washington, Seattle, Chapter 1.
Cain, S.A. and De O. Castro, G.M. (1959). Manual of Vegetation Analysis . Harper & Brothers, New York.
Clark III, A. and Schroeder, J.G. (1977). Biomass of Yellow Poplar in Natural Stands in Western North Carolina ,
Paper SE-165. U.S. Department of Agriculture Forest Service, Washington, DC.
Clark III, A., Phillips, D.R., and Hitchcock, H.C. (1980). Predicted Weights and Volumes of Scarlet Oak Trees
on the Tennessee Cumberland Plateau , Paper SE-214. U.S. Department of Agriculture Forest Service,
Washington, DC.
Daubenmire, R.E. (1968). Plant Communities: A Textbook of Plant Synecology . HarperCollins, New York.
Dunlap, W.H. and Shipman, R.D. (1967). Density and Weight Prediction of Standing White Oak, Red Maple,
and Red Pine , Research Brief. Pennsylvania State University, University Park, PA, pp. 66-69.
Elzinga, C.I., Salzer, D.W., and Willoughby, J.W. (1998). Measuring and Monitoring Plant Populations ,
Technical Reference 1730-1. U.S. Department of Interior, Bureau of Land Management, Denver, CO.