To compute cubic-foot volume for a juniper tree, first find the volume of a single- 

 steinmed tree to a 1-in minimum top diameter in table 5. Second, in table 7 find the 

 appropriate proportion for the basal diameter of the tree and the desired minimum top 

 diameter limit. Finally, in table 9 find the appropriate proportion for the number of 

 stems and the desired minimum top diameter limit. Multiply the values obtained from 

 tables 5, 7, and 9 together to obtain the cubic-foot volume of the tree to the desired 

 minimum top diameter limit. Metric volume is obtained by the same procedure except 

 that tables 6, 8, and 10 are used instead of tables 5, 7, and 9. 



Example: Assume a pinyon tree 10-in basal diameter and 30 ft tall. Determine 

 the cubic-foot volume of this tree to a 4-in minimum top diameter limit. From table 1, 

 the value 8.82 cubic feet is read. From table 3, the proportion 0.692 is read. The 

 cubic-foot volume of this tree to a 4-in top is then 6.1 ft (8.82 X 0.692). 



Example: Assume a juniper tree 12-in basal diameter, 20 ft tall, and having three 

 stems originating within the first 12 in above ground line. Determine the cubic-foot 

 volume of this tree to a 4-in minimum top diameter limit. From table 5, the value 8.034 

 is read. From table 7, the proportion 0.659 is read. From table 9, the proportion 

 0.686 is read. The cubic-foot volume of this tree to a 4-in top is then 3.63 ft 

 (8.034 X 0.659 X 0.686) . 



CONCLUSIONS 



The equations, computer subroutines, and tables presented in this paper are 



applicable throughout northern New Mexico for volume estimation in the pinyon- juniper 



type. Use outside of northern New Mexico should be accompanied by appropriate field 

 checks . 



10 



