-I 



Appendix 



Terminology 



Cull trees . --hive trees of commercial species that will not now or in the future 

 qualify as sawtimber 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 alasses . 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. 



Grcwing stock trees. --Live trees of commercial species except those that are cull 

 because of form, rot, or other defect. 



Growing stock volume . --Net 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 inside 

 bark of the central stem or to the point where the central stem breaks into limbs. 



Logging residues .--The unused portions of trees cut or killed by logging. 



Net volume. --Gross volume less deductions for rot, sweep, or other defect affect- 

 ing use for timber products. 



Poletimher trees .- -Growing stock trees likely to grow into merchantable sawtimber 

 trees. They must not show evidence of rot in the main stem or 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. 



Sawtimber trees, --Growing stock trees containing at least a 12-foot saw log with 

 not more than two-thirds of the gross board-foot volume in cull material. Softwoods 

 must be at least 9.0 inches d.b.h. and hardwoods at least 11.0 inches. 



Sawtimber volume .--'Net volume (in board feet International 1/4-inch log rule) of 

 sawtimber trees between a 1-foot stump and a specified merchantable top--fixed or vari- 

 able. A fixed top is 7 inches d.i.b. A variable top varies with d.b.h. as follows: 



Range in d.b.h . Top d.i.b . 



Inches Inches 



9, 



,0 - 



io 



.9 



5 



11, 



.0 - 



14. 



.9 



6 



15, 



,0 - 



18, 



.9 



7 



19, 



.0 - 



20, 



.9 



8 



21, 



,0 - 



24, 



.9 



9 



25, 



• Oh- 







10 



13 



■tx GPO 782 



