RESEARCH SUMMARY 



Relationships between live and dead crown weight and d.b.h. (ranging 

 from to 40 inches), crown length, tree height, and crown ratio are 

 presented for 11 conifer species in the Rocky Mountains. D.b.h. was 

 highly correlated with crown weight; however, for most species, addition 

 of height, crown length, and especially crown ratio improved precision. 

 Site index and stand density improved precision of estimates slightly for 

 about one-half of the species. Crown ratio accounted for most of the 

 differences in crown weight between dominant and intermediate crown 

 classes. Relationships between bole weights and d.b.h. and height are 

 presented for trees up to 4 inches d.b.h. 



For partitioning estimates of crown weight into foliage, and branchwood 

 diameter classes (0- to 0. 24-inch, 0. 25- to 0. 99-inch, 1. 00- to 2. 99-inch 

 and 3.00-inch and larger), accumulative fractions of foliage and branchwood 

 and their relationship to d.b.h. are presented. Relationships between 

 weights of foliage and branchwood by diameter classes, highly correlated 

 with branch basal diameter, are included. 



Bulk densities for foliage and branchwood of live crowns ranged from 

 0.04 to 0. 14 lb/ft and were approximately twice that for foliage alone. 

 Bulk densities and crown moisture contents were greater in the upper crowns. 



