GLOSSARY 



Acceptable tree 



Growing-stock tree of commercial species that does not qualify as a de- 

 sirable tree. 



Access 



The degree to which the range will be utilized. The factors affecting 

 grazability are slope, miles to the nearest stream, trails and roads in the 

 area, water developments, brush, slash, rocks and mechanical barriers. 



Accretion 



Annual increase in net volume of trees in a size class, and the increase 

 in net volume of trees after reaching a measured size class during the 

 year. 



Allowable cut 



The volume of timber that would be cut on commercial forest land during 

 a given period under specified management plans for sustained produc- 

 tion such as those in effect on national forests. 



Animal Unit 



One mature (1,000 pound) cow with or without an unweaned calf, or the 

 equivalent. A mature bull is 1.3 animal units, a mature horse is 1.25 

 animal units, a mature sheep is 0.2 of an animal unit, a mature elk is 

 0.7 of an animal unit, and a mature deer is 0.2 of an animal unit. 



Animal unit month 



The amount of forage required by an animal unit for one month. 



Area condition class 



A classification of commercial forest land based upon stocking by desir- 

 able trees and other conditions affecting current and prospective timber 

 growth. 



Basal area 



A measure of square feet of space occupied by the stem of a tree. This 

 measurement is made at breast height. 



Basal area factor 



The basal or stem area per unit of stand area for a given angle for each 

 tree intercepted from a given point. 



Basal area standard 



Sixty percent of normal basal area usually for trees 0.6 inches d.b.h. 

 and larger. 



Bureau of Land Management lands 



Federal land administered by the USDI Bureau of Land Management. 



Census water 



Water areas of more than 40 acres and water courses more than 1/8 mile 

 wide. 



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