THE AUTHOR 



DAVID C. CHOJNACKY is a research forester in the Forest 

 Survey unit, Intermountain Research Station. He holds a 

 B.S. degree in mathematics from the University of Idaho, 

 Moscow, an M.S. degree in watershed management from 

 the University of Arizona, Tucson, and a Ph.D. degree in 

 forest biometry from Colorado State University, Fort Collins. 

 He has been with the Forest Service since 1979. Before 

 coming to Ogden, he worked for the Forest Research 

 Laboratory at Oregon State University, Corvallis. 



RESEARCH SUMMARY 



Cubic foot volume equations have been developed for 

 Arizona's juniper, pinyon, oak, and mesquite species. 

 Volume predictions can be obtained for wood and bark 

 combined of all stem and branch material 1.5 inches in 

 diameter and larger. The required measurement variables 

 are tree basal diameter near the root collar and total tree 

 height. 



The equations were based on data collected on 1,442 

 trees at 291 field locations throughout Arizona. Data were 

 collected on all woodlands owned or managed by the 

 following: State of Arizona; private individuals and corpora- 

 tions; Papago, Hopi, and Kaibab Indian Reservations; 

 Coronado and Prescott National Forests; all Arizona Bureau 

 of Land Management Districts; and several other public 

 entities. 



Results are presented in equation and tabular formats. 

 Volume equation construction and equation reliability are 

 discussed. Graphs display results compared to those from 

 other available Arizona woodland volume studies. 



ACKNOWLEDGMENTS 



Many individuals contributed to the 1985 Arizona wood- 

 land inventory. They provided the necessary data for volume 

 equation construction. Participants were from the U.S. 

 Department of Agriculture, Forest Service; U.S. Department 

 of the Interior, Bureau of Land Management and Bureau of 

 Indian Affairs; and Arizona State Land Department. Special 

 thanks to field crew leaders, Frank Angele, Ali Conner, 

 Roger Conner, Claire Dailey, Larry DeBlander, Valerie 

 Kalve, and Robert Rhoads, from the Intermountain Research 

 Station, who trudged throughout Arizona's woodlands for 10 

 months to collect the data. 



Cover photos: Upper: One-seed juniper above Chino 

 Valley, Prescott National Forest. 

 Lower: Mesquite across valley from Santa 

 Rita Mountains, Coronado National Forest 



Intermountain Research Station 

 324 24th Street 

 Ogden, UT 84401 



