Canadian Forest Service Publications

Simulation of interactions among fire, mountain pine beetle and lodgepole pine forest. 2004. Li, Chao; Barclay, H.J. Pages 257-266 in T.L. Shore, J.E. Brooks, and J.E. Stone, editors. Mountain Pine Beetle Symposium: Challenges and Solutions, October 30-31, 2003, Kelowna, British Columbia, Canada. Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, Victoria, British Columbia, Information Report BC-X-399. 298 p.

Year: 2004

Issued by: Pacific Forestry Centre

Catalog ID: 25054

Language: English

CFS Availability: PDF (download)

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Abstract

This paper describes a modelling research approach for the proposed new study of the interaction of fire and mountain pine beetle via forest age structure. This approach is theoretical and provides an analysis of how the stability of forest age-distributions is related to fire regimes. Starting with the derivation of the theoretical negative exponential forest age-distribution, we have used three models to explore the conditions under which a stable age-distribution could be expected. The results suggested that a stable age-distribution could always be achieved as long as the forest age-specific mortality is constant over time, and the shape of a stable age-distribution is mainly determined by the forest age-specific mortality. However, the stability of the forest age-distribution will be reduced when a small variation in the age-specific mortality is introduced. The simulation results of the possible patterns of the age-distribution under various fire regimes indicated that a variety of age-distribution curves could appear, including negative exponential and also other curves with one or multiple peaks. The results suggested that a stable forest age-distribution might never be achieved if the forest landscape is subjected to large and irregular fire disturbances. The age distributions are then related to susceptibility to mountain pine beetle attack, via a susceptibility algorithm.