Table 1 — Summary of Arizona woodland volume data by species group 



Ownership or 



Number of 



Mean 



Median 



Mean 



Mean 



Single-stem 



Number of 



management agency 



trees 



volume volume 



DRC 



height 



trees 



plots 1 







Ft 3 



Ft 3 



Inches 



Feet 



Percent 











Juniper species group 









Private or corporate 



169 



7.5 



2.4 



12.0 



12 



41 



37 



Arizona Strip BLM District 



91 



8.4 



2.7 



11.4 



13 



68 



20 



C".nmrmc\n Nz^tinnal Prtrpct 



VUIUI laUU I N Ci II \J 1 I a I I Ul Lol 



88 



6.5 



2.9 



11.3 





Do 



ou 



State of Arizona 



83 



10.7 



5.2 



13.8 



14 



43 



17 



Prescott National Forest 



75 



6.9 



1.6 



9.9 



13 



64 



15 



Phoenix BLM District 



do 



3.7 



1.3 



10.0 



10 



35 



5 



Honi Indian Rp^prv^tinn 



■\ -I 



7.9 



5.9 



13.8 



1 9 



OH 



4 



Kaibab Indian Reservation 



5 



9.4 



6.0 



11.6 



19 



mo 



1 



I 



Total 



545 



7.8 



2.6 



11.7 



13 



52 



149 







Mesquite species group 3 









State of Arizona 



i OA 



2.9 



1.4 



8.2 



1 1 



35 



23 



Panann Indian Rp^prvation 



i upauu ii it_jicii I I icoci vauui I 



67 



2.5 



1.2 



7.0 



1 ? 



HO 



1 K 

 I D 



Coronado National Forest 



55 



4.2 



1.0 



8.1 



12 



55 



13 



Private or corporate 



49 



1.8 



0.8 



7.4 



10 



39 



9 



oaiToro bLM utstnct 



i y 



1.5 



1.0 



8.0 



8 



21 



5 





p. 



1.1 



.6 



5.8 



1 1 

 i i 





1 



l 



Phopnix Rl M District 



5 



1.4 



1.3 



5.8 



13 



40 



i 

 i 



Total 



321 



2.7 



1.2 



7.7 



11 



41 



68 









Oak species group 











Coronado National ForGst 



298 



3.5 



1.8 



9.0 



12 



62 



99 



Private or corporate 



31 



7.0 



2.6 



10.1 



16 



48 



9 



Prescott National Forest 



10 



4.7 



3.2 



10.0 



16 



30 



4 



oairora dlm uisinci 



Q 



O 



1.1 



.5 



6.6 



y 



bU 



d 



Qtato nf Ari7nna 



O La t C vj 1 nl l£UI la 



O 



12.1 



12.1 



12.4 



1 H 



1 no 

 I uu 



I 



Othpr ni ihlif* 



Vw/ L 1 ICI \J U L J 1 Hj 



1 



76.4 



76.4 



26.6 



OJ 





1 

 1 



Total 



350 



4.0 



1.8 



9.1 



13 



60 



116 









Pinyon species group 









Coronado National Forest 



76 



2.5 



1.3 



7.1 



13 



95 



37 



Arizona Strip BLM District 



32 



3.3 



1.1 



7.2 



14 



100 



14 



Private or corporate 



32 



2.7 



1.0 



7.0 



13 



88 



12 



Qtatp nf Ari7nna 



Altaic VJI \^\J\ Id 



31 



4.7 



1.7 



7.8 



id 



QA. 



Q 



Prescott National Forest 



25 



3.2 



1.6 



6.6 



17 



100 



9 



Hopi Indian Reservation 



1 o 



1.8 



.6 



6.8 



1 1 



100 



4 



Phoenix BLM District 



9 



12.6 



2.4 



10.1 



17 



89 



4 



Safford BLM District 



5 



.8 



.5 



5.1 



11 



100 



2 



Kaibab Indian Reservation 



3 



1.6 



.2 



5.5 



13 



100 



1 



Total 



226 



3.3 



1.2 



7.2 



14 



95 



92 



'Because more than one species group occurred on many plots, summation of totals exceeds the total number of study plots. 

 'Includes 12 Olneya and 19 Acacia. 



from map grid points systematically established on all 

 woodlands of the owner or management groups sampled. 



Resulting sampling intensities, with two exceptions, 

 were about one plot located every 15 miles across the land 

 base inventoried. The two exceptions, the southern 

 Arizona counties and the Coronado National Forest, were 

 sampled more intensively at about one plot every 10 miles 

 and one plot every 3 miles, respectively. This was done to 

 ensure a large enough sample of mesquite and evergreen 

 oak trees. Sampling intensities were established on maps, 

 and only those plots supporting woodland vegetation were 

 field sampled. Therefore, actual field plots were spaced 

 out much farther than the initial sampling grid because of 



many nonwoodland inclusions within the land base inven- 

 toried. Field plot size was 0.2 acre when crown cover of 

 the surrounding stand was less than 30 percent, and 0.1 

 acre when crown cover was more than 30 percent. On 

 each plot, about six trees (four for the Coronado) were 

 randomly selected from three diameter classes, 3.0 to 9.9, 

 10 to 18, and >18 inches diameter at root collar (DRC). 



Volume estimation was done using visual segmentation, 

 a nondestructive method of counting the numbers of wood 

 segments within a tree (Born and Chojnacky 1985). Wood 

 segment dimensions were determined by dividing tree 

 stems and branches into 1- to 6-foot length sections using 

 2-inch diameter classes. Some segment dimensions in 



2 



