3396 Chapter 27 



Table 27-65A — 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) 



Cubic-foot Coefficient of Standard Number trees 



volume determination error^ sampled 



(Y) Regression equation' (R^) (Sy,x)^ (N) 



Whole tree 



(excluding 

 foliage): 

 Wood Y = 0.002439 (D^TH) 



2titn 1.00568 



Bark Y = 0.000633 (D2Th)0^709i 



Wood & bark . . Y = 0.003052 (D^Th)' ^ooh 



Stem from stump 



to 4-inch 



d.i.b. top: 



Wood Y = 0.001763 (D^Th) '01258 



Bark Y = 0.000460 (D^Th)^-^^^^^ 



Wood & bark . . Y = 0.002183 (D^Th) '00496 



Crown material (all 



branches and 



topwood <4 



inches d.i.b. 



excluding 



foliage): 



Wood Y = 0.000697 (D^Th)^ ^7993 



Bark Y = 0.000188 {D^lhf-^^^^ 



Wood & bark . . Y = 0.000889 (D^Th)^ ^8263 



See Footnote at end of Table. 



