Decision Support Systems for ACE - 130-011

Description: Historically, density manipulation has been the dominant theme underlying intensive forest management (IFM) programs within Canada. Furthermore, when temporal/spatial explicit stand-level responses are acaled to the forest-level within forest management units with unbalanced age-structures and excess mature stands, increased annual allowable cuts (AAC) via the Allowable Cut Effect (ACE) are possible given the change in stand-sequencing within the harvest queue.

Currently, however, forest managers are unable to predict stand developmental pathways for a given denisty treatment, due principally to the lack of managed stand response data and corresponding integration of such data into operational decision-support tools. Furthermore, stand-level density management decisions must address the inversely related objectives of maximizing merchantable volume per unit area and individual tree size simultaneously.

Consequently, the objective of this study was to develop stand density management decision support models for boreal conifers, specifically Black Spruce and Jack Pine stand types.

Stand density management diagram for black spruce plantations with thinning regimes superimposed: expected 75-year size-density trajectories with 5-year intervals denoted for three user specified denisty management regimes. Note: program input: 1) regional code = 4 for Ontario; 2) site index = 15m at 50 years; 3) regime 1 - initial planting density 3000 stems/ha; 4) regime 2 - first thinning of 1500 stems/ha at 35 years and a second thinning of 500 stems/ha at 50 years; and 5) regime 3 - 1 thinning of 2000 stems/ha at 40 years.


The Project Team: Peter Newton, CFS, Vic Wearn, Alg0-Temp Services Inc.


Tree Tips:

Tree Tip FRP Project no. 130-011


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