Table 1. — data sources 



Species 



National Forest 



Coconino : Tonto : Lincoln : Santa Fe: Carson 



Blackjack pine^ {Pinus ponderosa 

 Laws. ) 



Yellow pine^ {Pinus ponderosa 

 Laws. ) 



E)ouglas-fir {Pseudotsuga menziesii 

 var. glauca [Mirb.] Franco) 



White fir (Abies concolor [Gord. 

 and Glend. ] ) 



Southwestern white pine (Pinus 

 flexitis var. refZexa Engelm.) 



Engelmann spruce (Picea 

 engeVraannii Parry) 



Aspen (Populus tremuloides Michx.) 



Corkbark fir (Ahies lasiocarpa 

 var. arizoniaa [Merriam] Leiim.) 



X 

 X 



^In the Southwest, blackjack and yellow pines cire distinguished by their 

 bark colors; blackjack pines have very dark bark cuid yellow pines heavily 

 plated, orange bark. This distinction is based on age, growth, and vigor 

 differences rather than botanical differences, but foresters have found it 

 useful in forest management planning. 



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