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Stand and Tree Integrated Model
Minor changes were made in the software after release of the user's manual. The 2.2a user's manual still applies to version 3.0.
The aspen growth model is for trees 9.1 cm and above. Model predictions are unstable for aspen trees less than 9.1 cm. Avoid inputting trees below this threshold.
Can STIM be installed on a central server to be used by multiple users over a network?
No, it cannot. STIM currently has to be loaded onto each user's PC.
After I have grown a stand to age 90, for example, can I 'backup' to age 45 and grow it again with different parameters?
No, you can only grow a stand forward from the current age, i.e., the last record in the yield output window. You must generate an identical new stand, then grow it to age 45 before you can change the parameters of interest.
Are there any plans to calibrate STIM for other species or treatments?
The Canadian Forest Service developed the hemlock and trembling aspen models and subsequently transferred the models to the Ministry of Forests. The Ministry currently has no plans for further STIM developments, but it is giving consideration to STIM as it continues to develop a growth and yield modelling strategy for BC.
Each model has on-line help accessible from within the Windows interface. The on-line help virtually duplicates the hardcopy manual. The manuals:
are available for download in electronic format from our Growth and Yield Software Registration and Download page
For more information about STIM see pubs/References
Current the Ministry resources only provide for distribution services. Resources for user support services and staff familiarity with the models are minimal but we will try to answer user questions to the extent that we are able. Direct questions to: Mario Di Lucca.
In addition, the private consultant (Jim Flewelling) who was involved with the original development of these models is willing to answer questions about model construction and behavior (please note that he receives no payment from the Ministry for this).
Currently no STIM training is available
Bonnor, G.M; R.J. De Jong; P. Boudewyn and J.W. Flewelling. 1995. A guide to the STIM growth Model. Canadian Forest Service, Pacific Yukon Region, Information Report BC-X-353. 38 pp.
De Jong, R.J.; A. A. Zumrawi; P. Boudewyn and J.W. Flewelling. 1995. STIM User's Manual (for Windows) Ver 2.2a (Hemlock) FRDA Report No. 237. 25 pp.
De Jong, R.J.; A. A. Zumrawi; P. Boudewyn and J.W. Flewelling.1996. STIM User's Manual (for trembling aspen) Ver 3.0 FRDA Report No. 253. 25 pp.
Forest Productivity Councils of British Columbia, 1991. A guide to growth and Yield Models of the Pacific Northwest, British Columbia Ministry of Forests, Inventory Branch, Victoria, 25 pp.
Hynk, D.M.; Scott, W.; Leon, R.M. 1988. Some important aspects in the development of a managed stand growth model for western hemlock. In. A.R. Ek; S.R. Shifley; and T.E. Burk, Eds. Forest Growth Modelling and Prediction, USDA For. Serv., Gen. Tech. Rep. NC-120. pp. 9-21.
Snowdon, B.D. 1995. An evaluation of STIM, a western hemlock growth model, using WinTIPSY as a benchmark. British Columbia Ministry of Forests, Silviculture Branch, Unpublished. Report, Victoria, 35 pp.
Hardcopies of all four STIM related reports mentioned above can be requested from: Publications, Canadian Forest Service, Pacific Forestry Centre, 506 West Burnside Road, Victoria, B.C. V8X 1M5.
Last Modified: 2002 OCT 25. Ministry Contact: Mario di Lucca