EP 1266


Project Title:

Growth and Yield Modelling of Hardwood Species and Boreal Mixedwoods with the Tree and Stand Simulator (TASS)

Reference Numbers:

EP 1266 (TASS Hardwood & Mixedwood Modelling); Subcomponents: EP 1266.01 (red alder calibration for TASS/TIPSY), EP 1266.02 (aspen calibration for TASS/TIPSY), EP 1266.03 (birch calibration for TASS/TIPSY); Modelling Boreal Mixedwoods funded under FIA-FSP Y061051 (2005/06), FIA-FSP Y072051 (2006/07), FIA-FSP Y083051 (2007/08)

Project Start/End Dates:

April 2002/Ongoing

Keywords:

Tree and Stand Simulator (TASS), Table Interpolation Program for Stand Yields (TIPSY), stand development modeling, growth and yield estimates, hardwoods, mixedwoods, boreal, aspen, spruce, pine, growth relationships, tree growth, light levels, complex stands, stand dynamics, Northern Interior Forest RegionTop

MFR Initiatives Supported:

timber supply, Allowable Annual Cut determination, industry competitiveness, Future Forest Ecosystem Initiative, Coastal Forest Action Plan, second growth management, forest inventory, hardwood density management

BEC Units:

ICH, IDF, SBS, BWBS

Objectives:

  • To incorporate TASS aspen, red alder, and birch yield information into the TIPSY database;
  • To enable simulations of aspen-spruce and aspen-pine boreal mixedwood stand development by incorporating best available information on height, diameter, and crown growth relationships into TASS III and refining the model with field data;
  • To determine the relationships between growth and light for white spruce and lodgepole pine in aspen-spruce and aspen-pine boreal mixedwood stands;
  • To provide biologically defensible growth and yield estimates for boreal mixedwoods and complex stands by developing TASS-III understorey growth functions.Top

Summary:

Gap analysis of present boreal mixedwood management has suggested that several key issues need to be addressed, including: lack of fundamental ecological data, inadequate forest inventory, and limited development of site productivity and growth and yield modeling tools tailored for boreal mixedwood forests. Northern forest managers need to accurately forecast responses to silviculture practices, natural disturbance, succession, and the interaction of stand dynamics with site productivity, economics and other factors. This information will provide managers with science-based decision-support tools to support timber supply analysis, and enhance our ability to explore innovative silviculture and adaptive management options.

Related Publications:

Harper, G.J., M. O'Neill, P.P. Fielder, T.A. Newsome, and S.C. DeLong. 2009. Lodgepole pine growth as a function of competition and canopy light environment within aspen dominated mixedwoods of central interior British Columbia. For. Ecol. Manag. 257(8):1829-1838.

Harper, G. J. 2008. Quantifying branch, crown and bole development of Populus tremuloides Michx. from north-eastern British Columbia. For. Ecol. Manag. 255(7):2286-2296.

Harper, G. and K. Polsson. 2007. Modelling boreal mixedwoods with the Tree and Stand Simulator (TASS). B.C. Min. For. Range, Res. Br., Victoria, B.C. Exten. Note 80.

Harper, G., R. Astrup, and D. Simpson. 2006. TASS III Boreal mixedwood modelling: light and understorey tree growth. Poster presented at the Post Harvest Stand Development Conference, January 31st-Feb.01, 2006. Edmonton, Alberta. Also available at B.C. Ministry of Forest and Range website as poster # 077.

Astrup, R. 2005a. Review of the relationship between light availability and growth of understorey spruce. Contract report for the Research Branch, BC Min. of Forests and Range, Victoria, BC. November 2, 2005.

Astrup, R. 2005b. Review of the relationship between light availability and growth of understorey pine. Contract report for the Research Branch, BC Min. of Forests and Range, Victoria, BC. November 2, 2005.

Version 4.1 of TIPSY including the aspen database is available on our website. [link]Top

 

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Figure 1. TASS III simulation, aspen-spruce mixedwood.   Figure 2. TASS III simulation, aspen-spruce mixedwood.
     
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Figure 3: White spruce-aspen canopy.   Figure 4: Complex aspen canopy spatial and temporal dynamics: foliage density, clumping, and canopy gaps.
     
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Figure 5: Understorey with small white spruce shaded by a young trembling aspen stand. Figure 6: Mature white spruce-aspen mixedwood.
     
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Figure 7: Measuring branch, crown and bole development in trembling aspen.   Figure 8: Aspen regeneration first summer after winter logging of a boreal mixedwood cutblock.

Contact Person: George Harper, Research Scientist, Stand Development
Email: George.Harper@gov.bc.ca

 

Please direct questions regarding webpage to For.Prodres@gov.bc.ca
Updated April 2008