ABSTRACT 



Functional forms of equations were derived for predicting 10-year periodic 

 height increment of forest trees from height, diameter, diameter increment, 

 and habitat type. Crown ratio was considered as an additional variable for pre- 

 diction, but its contribution was negligible. Coefficients of the function were 

 estimated for 10 species of trees growing in 10 habitat types of northern Idaho 

 and northwestern Montana. A procedure using these coefficients for calculating 

 the components of current annual volume increment from diameter, height, and 

 past radial increment is described, and its FORTRAN implementation listed. 



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