RESEARCH SUMMARY 



Comprehensive tree volume equations and the methodology used to 

 derive them are presented for the major tree species of New Mexico and 

 Arizona. With these equations, the following gross and net volume types 

 can be computed for both unforked and forked trees: total stem cubic 

 foot volume; mercliantable cubic foot volume to any top diameter between 

 3 and 8 inches, inside bark; International 1/4-inch board foot volume to 

 a 6-inch top, inside bark; and Scribner board foot volume to a 6-inch 

 top, inside bark. These equations were developed in such a manner as 

 to eliminate many of the problems of consistency, compatibility, 

 reliability, and flexibility associated with previous sets of volume 

 equations. This approach also allows the user to divide total stem 

 cubic foot volume into top volume, merchantable volume, and stump 

 volume. This last feature is useful for predicting the level of residues 

 after harvesting to various top diameters. 



