TERMINOLOGY 



Cull trees .'-hive trees of commercial species 

 that will not now or in the future qualify as saw- 

 timber trees because of dimensions, form, rot, or 

 damage. Also includes all live trees of noncommercial 

 species . 



Cull volume .--Portions of a tree that are unusable 

 for industrial wood products because of rot, form, 

 or other defect. 



Diameter classes .--A classification of trees 

 based on diameter breast height (d.b.h.) outside bark. 

 Two-inch diameter classes used by Forest Survey are 

 identified by the diameter at the approximate midpoint 

 of each class. For example, the 2-inch class includes 

 trees 1.0 to 2.9 inches d.b.h. 



Growing stock trees . --Live trees of commercial 

 species, except those that are cull because of form, 

 rot, or other defect. 



Growing stock volume. --^et volume in cubic feet 

 of growing stock trees 5.0 inches d.b.h. and over from 

 a 1-foot stump to a minimum 4.0-inch top diameter in- 

 side bark (d.i.b.) of the central stem or to the point 

 where the central stem breaks into the limbs. 



Logging residues . --The unused portions of trees 

 cut or killed by logging. 



Net volume .--Gross volume less deductions for 

 rot, sweep, or other defects affecting use for timber 

 products . 



Foletimber trees . --Growing stock trees likely to 

 grow into merchantable sawtimber trees. They must not 

 show evidence of rot in the main stem nor have serious 

 damage, crook, or stagnation. Softwoods must be from 

 5.0 to 8.9 inches d.b.h. and hardwoods from 5.0 to 

 10.9 inches d.b.h. 



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