AGE-CULL RELATIONSHIP 



Most foresters know that the percentage of cull increases 

 with the age of the trees in a stand. To demonstrate the relation 

 of tree age to cull percent, the study trees were separated into 

 50-year age groups and the cull determined for trees of each age 

 class. Smooth curves were drawn showing: 



(1) The average percent of the gross board-foot volume 

 that is cull in the sawlog portion of trees (fig. 22). 



(2) The percent of gross cubic-foot volume of the entire 

 tree that is cull (fig. 23). 



(3) The percent of trees of each species that contained 

 measurable amounts of rot at different ages (fig. 2U) . 



Since the data upon which figures 22, 23, and 2k are based 

 may be of value to Alaska forest workers, they are given in table 

 10 for each tree species. 



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