Pine Age Classes 



Criteria used to select the ponderosa pine overstory stands on the 35 study plots 

 assured that the stands would contain a mean of at least 10,000 gross board feet per 

 acre in pine trees classified by the Ponderosa Pine Tree Classification as mature or 

 overmature. The initial age class inventory of the nearly 12,000 sawlog-size ponderosa 

 pine trees in the plot stands showed that 75 percent of them were in these two age 

 classes as shown by the following tabulation: 



Age classes 



Bumbev 

 of trees 



Percentage 

 of trees 



Young 

 Immature 

 Mature 

 Overmature 



2,735 

 5,536 

 5,209 



466 



3.9 

 22.9 

 29.6 

 43.6 



Total 



11,946 



100.0 



13 



