Cubic-foot - The average annual increase in sound cubic volume 

 of trees larger than 5.0 inches d.b.h. from stump to a 4- inch 

 top plus the average annual sound volume of trees reaching 5.0 

 inches d.b.h. 



Board-foot - The average annual increase in sound wood volume 

 of trees 11.0 inches d.b.h. and larger plus the average annual 

 volume of trees reaching 11.0 inches d.b.h. and larger, from 

 stump to merchantable sawlog top. 



Net growth - The average annual gross growth less average annual 

 mortality for the specified period. 



Cubic-foot - The gross cubic-foot growth discounted for average 

 annual mortality. 



Board-foot - The gross board-foot growth discounted for average 

 annual mortality. 



Mortality 



The average annual volume drain of timber attributable to death from 

 natural causes - fire, insects, disease, windthrow, etc. - during a 

 specified period. 



Cubic-foot - The average annual cubic-foot volume drain of 

 timber attributable to death from natural causes. Standards of 



measurement are the same as for cubic-foot volume and cubic- 

 foot growth. 



Board-foot - The average annual board-foot volume drain 

 attributable to death from natural causes. Standards of measure- 

 ment are the same as for board-foot volume and board- foot growth. 



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