Canadian Forest Service Publications

Forest stand dynamics applied to black spruce in Quebec (DYPEUFOR) 1978. Ung, C.-H.; Beaulieu, J.; Bégin, J. s.n., S.l. Rapport d'information LAU-X-29E. 119 p.

Year: 1978

Issued by: Laurentian Forestry Centre

Catalog ID: 16424

Language: English

Series: Information Report (LFC - Québec)

CFS Availability: PDF (download)

Mark record


This paper describes a simulation model reproducing the development over time of a coniferous forest. The purpose of the model is to test the dynamic effects on total volume and tree dimensions of silvicultural activities like thinning, fertilising or ditching, and to evaluate the consequences of natural phenomena such as wind throw, which is considered as a stochastic event.

Cause and effect relationships in the forest system are presented in the shape of a dynamic model: a multiloop feedback system. In that case, forest growth is viewed as a state which is determined by an accumulation process controlled by total volume (ft3/acre) and stand density (number of trees/acre).

In addition, the development over time in an undisturbed forest or in stands impacted by external actions is determined by means of differential equations.

The structure of this model is so designed as to cause the complex interactions between elements of the model to act all at once and to show the real effect of any action taken on the forest ecosystem. This involves many advantages out of which:

  • any behaviour or response of the forest can easily be visualized on graphics.
  • it provides the user with an overall view of the forest system as a whole in a way that is accessible to the uninitiated and so facilitates communications between laymen and experts.