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Mixedwood Growth Model
Model Development


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Model OriginsReturn to top of page

Rationale – Why do we need MGM?

Forest Managers need to know the growth and yield, and the ecological and health implications, of proposed silvicultural regimes at both the stand and the forest level. Forest legislation requires the maintenance of a forest inventory and this implies the need for growth models for all types of stands.


In northeastern BC these models need to address succession of complex stands (i.e., mixed species and multi-aged) and partial cutting systems. In the future, the impacts of forest health on yield maybe become important. Because MGM models the development of complex stands, silviculture interventions, and potentially the forest health impacts on yield, it is fundamental to fulfilling the legislative requirements of the British Columbia Forest Practices Code and other legislation.

Funding Support

Early research (1986-1997) sponsored by the Alberta Forest Development Trust Fund and the Forest Management Division was conducted at the University of Alberta. Prior to 1998, the Alberta Environmental Protection Research Trust Fund and the Forest Management Division of the Land and Forest Service (LFS) sponsored model development. Additional funding is being received from the Natural Sciences Engineering Research Council (NSERC), and National Centers of Excellence (NCE) program on Sustainable Forest Management.


Planning for Northern BC

In February 1997 a strategy workshop aimed at determining client requirements and priorities was held in Edmonton. The British Columbia Ministry of Forests and industry representatives attended this session and expressed interest in participating in the MGM BC Project. The MGM Project Development Plan is based on the results of this workshop.

A planning session was held in Dawson Creek in March 1997? (confirm). Project organization was defined and a development plan drafted.

In the fall of 1998, a meeting in Prince George brought the team together to discuss status, plan for the future, and to give MOF and industry professionals an opportunity to attend a training session.

For a detailed list of what's new in this release of MGM, see Release News.

Link to Version History


Development StrategyReturn to top of page

The MGM development strategy is currently focused on the logistics of implementing a ministry-approved version of MGM for the boreal forests of BC by the year 2000. The strategy is to use a series of regional pilot test projects to validate the model for northeastern BC. The first step is to acquire suitable amounts of appropriate data. Results of the regional pilots will be compared to the Preliminary Validation Report (S. Titus, September 1998) which indicated a satisfactory degree of accuracy when using the Alberta version of the model with BC data.

A key strategic component is industry participation. The MGM Steering Committee is committed to encouraging and supporting industry involvement through the provision of training, technical support, and communication.

Development Team

The MGM Development Team consists of the following individuals and organizations:

Project Leader: S.J. Titus, Ph.D., Professor, Department of Renewable Resources, University of Alberta

Sponsor: Jon Vivian: Manager Terrestrial Information Branch, British Columbia Ministry of Sustainable Resources Management

Project Managers: Larry Badowski, Prince George Forest Region, British Columbia Ministry of Forests and Dave Morgan, Alberta Environmental Protection

Web Master
Mario Di Lucca, Research Branch, British Columbia Ministry of Forests

Steering Committee

The mandate of the Steering Committee includes, but is not limited to, the following:

  • Facilitate communication between stakeholders,
  • Provide project direction and guidance,
  • Provide technical support to the Development Team,
  • Discuss and resolve issues,
  • Participate in quarterly Steering Committee meetings (teleconference),
  • Evaluate and approve project scope changes
  • Develop and deliver user support.

Technical Advisory Committee

The MGM Technical Advisory Committee includes representatives from the public sector, academia and private industry from both BC and Alberta. The role of the Technical Advisory Committee is to:

  • work with the development project leader to develop model design
  • identify and assess user requirements
  • provide input to procedures and methodology
  • develop quality assurance guidelines for the model

Role of Industry Partners

The following industry partners are actively involved in the development of MGM:

Canadian Forest Products Ltd, Don Rosen

Timberline, Robert Vassov

Louisiana Pacific Canada Ltd., Mike Byl

Other BC and Alberta forest industry stakeholders include:

Chetwynd Forest Industries

Millar Western Industries

NEBC Mixedwood Cooperative

Slocan Group, Ltd.

Weldwood of Canada Ltd.

Weyerhaeuser Alberta, Ltd.

Western Boreal Growth and Yield (WESBOGY) Cooperative.


Current (and Future) DevelopmentReturn to top of page

Current development will incorporate basic relationships and the user interface.

Basic relationships

  • The database will be updated to combine data from provincial and industrial groups for use in calibration and model development.
  • Relationships between photo-based inventory variables and stand characteristics will be developed. If these relationships are not satisfactory, stands will be grouped into classes and average conditions determined for use in MGM projections.
  • Regional calibration will be completed using the updated re-measured plot database.

User Interface

  • A batch processor module will be developed that is capable of being incorporated into other GIS or relational data analysis systems.
  • A programming link between an inventory database and the MGM model will be developed using the Windows DLL coding model to link the database and the growth model. This interface will allow updating stands in a large database prior to timber supply analysis. This project is also contingent upon the ability to approximate stand conditions (species composition, average DBH, height, age, etc) based on the photo-based inventory variables. table formats.

 

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Last Modified: 2002 OCT 25. Ministry Contact: Mario di Lucca
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