Author Description

The purpose of this report is to describe the procedures used to calibrate the ONTWIGS model with the existing experimental data for logging or timber producing regions and to discuss the projections made with respect to growth response of drained and fertilized black spruce on peatland in northern Ontario. ONTWIGS, an adaptation of the LSTWIGS forest growth and yield projection system developed for the lake states, has been partially calibrated for boreal mixed-wood forests in Ontario. The report discusses growth projection systems for tree species in general, materials and methods, analysis of variance, and empirical calibration of ONTWIGS, discussion and conclusions.