Object & Deliverables
The primary objectives of this project were to: develop and enhance MGM (Mixedwood Growth Model), to improve its utility, validate and report on model performance, improve and enhance documentation and to provide training to users and regulators.
Summary of results:
Objective A: A growth model (MGM) with enhanced functionality
- Implementation and testing of the GYPSY Site Index Curves in MGM
- Implementation and testing of the GYPSY Site Index Curves in MGM (December, 2017) – Completed, March 31, 2018, Debugged implementation completed March 31, 2019, Validation and long term behavioral testing of the GYPSY Site Index Curves ongoing with planned release in June 30, 2019
- Implementing and testing growth modifiers to facilitate the modelling of tree improvement
- Implementing and testing of growth modifiers to facilitate the modelling of tree improvement (June 30, 2018) – partial implementation (completed March, 2019). Full implementation and testing completed August, 2020
- Recalibrate the bivariate tree list generator
- Recalibrate the bivariate tree list generator (March 31, 2019) – As a basis for recalibration, intensive testing and review of the current tree list generator has been completed. (Review of the current tree list generator’s “stand segmentation” approach completed. Modifications to the current tree list generator and MGM’s core functions to 3 improve model performance with the tree list generator data have been implemented.) Recalibration data and original compilation routines (SAS and R code) have been acquired. The current tree list generator has been revised and an interim version was released with the June 30, 2019 version of MGM. A full implementation of the recalibration to be completed by March 31, 2020.
Objective B: A published report describing, evaluating and validating the light model and the growth reduction functions for white spruce, trembling aspen and lodgepole pine
- Most field measurements for validating the light model and growth reduction functions for the adjacency model were completed in August 2018. Sampling was slated to be done in 2 pine and 2 spruce dominated stands with patch understory protection. However, suitable / accessible pine blocks could not be located after extensive searching, and suitable / accessible patch understory protection blocks were extremely difficult to find. Summer 2018 sampling commenced on the stand boundaries and residual patches of the 2 strip cut understory protection blocks sampled in 2017 and 2 additional spruce dominated blocks in the Fawcett Lake area. Some measurements remain to be completed in the summer of 2019 (approximately one week of field work remains).
- Acquired high resolution stereo photography and photo-derived canopy surface models to support analysis on the 2 strip cut understory protection blocks – Completed July 2018.
- Field data collection in 2 strip cut understory protection blocks for evaluating and validating the light model and the growth reduction functions for white spruce and trembling aspen (Objective B) – Completed July 2017.
- Objective C: MGM Best Practices Documents
- Best Practices Document 1 – released March 2018
- Best Practices Document 2 – released March 2019
- Best Practices Document 3 – released March 2020
- MGM Best Practices Document (Part 1- March 31, 2018). – Updated draft to be completed by June 30, 2019. The 2019 Best Practices Document was planned for posting online with the planned release of MGM on June 30, 2019, however – this was held pending review by Alberta Agriculture and Forestry staff .
Objective D: Updated documentation, website and model distribution system
- Updated documentation, website and model distribution system (December 31, 2017; June 30, 2018; March 31, 2019; December 31, 2019; and March 31, 2020). – Update of the website, documentation and online distribution system was in progress and was planned to be posted with planned release of MGM by June 30, 2019. See: https://mgm.ualberta.ca
Objective E: Two training sessions to transfer the knowledge and model functionality to users of this growth model
- Training session to transfer knowledge and model functionality to users of this growth model – MGM training workshops held in Edmonton (November 14 & 15, 2018) and Prince Albert, SK (February 21 & 22, 2019). (Note that the training session in Saskatchewan was funded by the Government of Saskatchewan and not by FRIAA).
The Final Report was submitted by Dr. Phil Comeau, October 10, 2020