Measures and yields of products and residues 



3417 



Table 27-81 — Black oak biomass regression equations (Tennessee Valley Authority 



1972) 



Component(s) Equation' Coeff. Det. R^ 



Complete Tree 



Fresh wood Log Y = 1.12282 + 2.12073 Log dbh 0.98 



Fresh bark Log Y = 0.53961 + 2.0131 1 Log dbh 0.95 



Fresh total Log Y = 1 .22080 + 2. 10416 Log dbh 0.98 



Dry wood Log Y = 0.90951 + 2. 1 1 178 Log dbh 0.97 



Dry bark Log Y = 0.27002 + 2.08383 Log dbh 0.96 



Dry total Log Y = 1 .00005 + 2. 10621 Log dbh 0.97 



Tree Crown 



Fresh wood Log Y = 0.58868 + 2.09742 Log dbh 0.88 



Fresh bark Log Y = 0.08437 + 2.08487 Log dbh 0.86 



Fresh total Log Y = 0.70890 + 2.09360 Log dbh 0.88 



Dry wood Log Y = 0.42075 + 2.06105 Log dbh 0.87 



Dry bark Log Y = -0.22974 + 2.19873 Log dbh 0.88 



Dry total Log Y = 0.50580 + 2.09357 Log dbh 0.88 



Merch. Bole 



Fresh wood Log Y = 0.79041 + 2.13126 Log dbh 0.96 



Fresh bark Log Y = 0.22951 + 1.77026 Log dbh 0.84 



Fresh total Log Y = 0.86878 + 2.10122 Log dbh 0.95 



Dry wood Log Y = 0.55932 + 2. 12847 Log dbh 0.95 



Dry bark Log Y = -0.02290 + 1.84814 Log dbh 0.84 



Dry total Log Y = 0.63832 + 2.10813 Log dbh 0.93 



Stump and roots 



Fresh wood Log Y = 0.51989 + 2. 10556 Log dbh 0.99 



Fresh bark Log Y = -0.07786 + 2. 10255 Log dbh 0.99 



Fresh total Log Y = 0.61783 + 2. 10475 Log dbh 0.99 



Dry wood Log Y = 0.28238 + 2. 12145 Log dbh 0.99 



Dry bark Log Y = -0.31613 + 2.11888 Log dbh 0.99 



Dry total Log Y = 0.38000 + 2. 12094 Log dbh 0.99 



Limbs, Up to 4 inches dob 



Fresh wood Log Y = 1.10606 + 1.32800 Log dbh 0.61 



Fresh bark Log Y = 0.48070 + 1 .48380 Log dbh 0.63 



Fresh total Log Y = 1.19125 + 1.37055 Log dbh 0.63 



Dry wood Log Y = 0.92513 + 1.31021 Log dbh 0.61 



Dry bark Log Y = 0. 16728 + 1.58130 Log dbh 0.66 



Dry total Log Y = 0.97158 + 1.38644 Log dbh 0.64 



Limbs, 4 inches dob and larger 



Fresh wood Log Y = -0.17751 + 2.51058 Log dbh 0.85 



Fresh bark Log Y = -0.86033 + 2.58256 Log dbh 0.87 



Fresh total Log Y = -0.09636 + 2.52525 Log dbh 0.86 



Dry wood Log Y = -0.37233 + 2.48400 Log dbh 0.34 



Dry bark Log Y = -0.11328 + 2.67315 Log dbh 0.88 



Dry total Log Y = -0.31213 + 2.52763 Log dbh 0.86 



'Y = aX^ or LogioY = Log,oa -\ b Log,oX 

 Where: 



Y = weight in pounds 

 X = dbh in inches 



^Note: First number of equation is the logio of a. Example: To calculate fresh weight wood for 



complete tree 20 inches = 1.12282 + 2.12073 (1.30103) 



= 1.12282 + 2.75913 



Log Y= 3.88195; Y = 7619 pounds 



