A Simulation Model of Secondary Forest Succession in an Engelmann Spruce (Picea engelmannii Parry)--Subalpine Fir (Abies lasiocarpa [Hook.] Nutt. ) Ecosystem


Category:  Ecology
Linked Publication
Language: English
Author(s): Randolph H. Sperger
Description: Spruce-Fir Succession Simulator (SFSSIM) is an ecological model of the changes in forest tree composition and structure as seen during subalpine meadow invasion or following fire in the Engelmann spruce (Picea engelmanni Parry) - subalpine fir (Abies lasiocarpa (Hook.) Nutt.) ecosystem of northern Utah. The mathematical framework of SFSSIM consists of difference equations describing the dynamics of the dispersal of reproductive propagules, subsequent germination, establishment, growth, and mortality of individual trees within the system. Output for 500 years of forest succession is presented and discussed. Model dynamics are in good agreement with the available data and support trends not easily demonstrated in previous traditional studies. Implications of the model to ecological theory in the area of community energetics and system stability are suggested.