I 



How to estimate future diameter 



The y's predicted in the equations of table 1 are the rogarithms of the change in 

 basal area, inside bark, for an individual tree. To use these growth values to estimate 

 future diameter, the Y's must be converted to a change in diameter, outside bark. 



Therefore, let 



then 

 or 



and 



'oh 



ln(x) 

 exp [x) 



y 



exp(y) 



ih 



diameter inside bark at end of decade 

 diameter outside bark at end of decade 

 diameter inside bark at start of decade 

 diameter outside bark at start of decade 

 natural log^ithm of x 

 exponential function of x 



0.7854 . ^.^2) 



+ 1.273238 exp (7) 



/c?^^^ + 1.273238 exp (7) 



7 



