Measures and yields of products and residues 3397 



Table 27-65 A — Regression equations for estimating above-stump green cubic-foot vol- 

 ume of the whole tree and its components for northern red oak trees 6 to 24 inches in dbh 

 from natural stands in the Southeast, using dbh and total height as independent variables 

 (Clark et al. 1980a)— Continued 



Cubic-foot 

 volume 

 (Y) Regression equation' 



Crown material 

 ^4.0 inches 

 d.o.b. (trees 



11.0 inches 



d.b.h.): 



Wood Y = 0.00000001 1 (D^Th)'^^^^^ 



Bark Y = 0.000000002 (D^Th)'^^^^^ 



Wood & bark . . Y = 0.000000013 (D^Th)'^^^' 



'Y = bo(D2Th)^" 

 where: 



Y = component volume in cubic feet. 



D = dbh in inches 



Th = total height of tree in feet, 



bob] = regression coefficients. 

 ^Standard error in logjo form. 

 ^Additional statistics for computation of confidence intervals: 



X(x-x)^ = 13.3864 and x = 4.0718 for equations based on 71 trees and 



S(x — x)^ = 1.6835 and x = 4.4538 for equations based on 35 trees. 



Table 27-65B — Regression equations for estimating above-stump green cubic-foot 

 volume of the whole tree and its components for scarlet oak trees 6 to 20 inches in 

 dbh from natural stands in the Southeast, using dbh and total height as independent 

 variables (Clark et al. 1980b) 



See Footnote at end of Table. 



