Project Code: ALPAC-01-025
Program: FRIP
Area:Applied Research
Sponsor:Alberta-Pacific Forest Industries Inc.
Region:NE Alberta
Project Status:Complete

Object & Deliverables


The goal of this project was to determine what early growth characteristics such as height over root collar diameter ratio (HDR) natural white spruce and jack pine trees possess and how this translates into which trees will survive and become dominant trees at rotation.
The principle objective was to fell and stem section co-dominant 50 to 70-year-old conifer trees in order to determine the HDR at 1 metre, 1.3 metre, 3 metre, 5 metre and 10 metre heights.
The sampling, data collection, data analyses, study findings/conclusions and report writing were carried out over the period of late 2005 to mid-summer 2006.
The HDR was found to be a useful assessment of competitive status for jack pine but less useful for white spruce. The number of years to sample height (height-age relationships) was found to be significantly different between suppressed and non-suppressed trees as was the mean annual height increment for both jack pine and white spruce. These data have provided promising indications that a tree-based metric for assessing competitive status is feasible.

Final Report

Study results are contained in a twenty-five page report entitled “Height to Diameter Ratio – An Assessment of Competitive Status for White Spruce and Jack Pine” prepared by the Forestry Corp. dated July 2006.