Full text of this article is only available in PDF format.

Jouni Vettenranta (email)

Distance-dependent models for predicting the development of mixed coniferous forests in Finland

Vettenranta J. (1999). Distance-dependent models for predicting the development of mixed coniferous forests in Finland. Silva Fennica vol. 33 no. 1 article id 670. https://doi.org/10.14214/sf.670


Distance-dependent growth models and crown models, based on extensive material, were built for Scots pine and Norway spruce growing in a mixed forest. The crown ratio was also used as a predictor in a diameter growth model to better describe the thinning reaction. The effect of crown ratio on the growth dynamics was studied in simulation examples. Monte Carlo simulation was used to correct the bias caused by nonlinear transformations of predictors and response. After thinnings the crown ratio as a predictor was found to be a clear growth-retarding factor. The growth retarding effect was stronger among pines with thinnings from below, whereas the estimated yield of spruces over rotation was slightly greater when the crown ratio was included than without it. With each type of thinning the effect of crown ratio on pine growth was almost the same, but the growth of spruces was clearly delayed when the stand was thinned from above. Simulation examples also showed that it is profitable to raise the proportion of spruces during rotation, since spruces maintain the growth more vigorous at older ages. The total yield during 90 years rotation was about 20% higher if the stand was transformed into a pure spruce stand instead of pine.

Norway spruce; Scots pine; competition; growth models; Monte Carlo simulation; crown models

Author Info
  • Vettenranta, Kivirinnanpolku 4, FIN-40950 Muurame, Finland E-mail vettenr@cc.joensuu.fi (email)

Received 10 June 1998 Accepted 18 February 1999 Published 31 December 1999

Views 2187

Available at https://doi.org/10.14214/sf.670 | Download PDF

Creative Commons License CC BY-SA 4.0

Click this link to register to Silva Fennica.
Log in
If you are a registered user, log in to save your selected articles for later access.
Contents alert
Sign up to receive alerts of new content

Your selected articles
Your search results
Vettenranta J., (1996) Effect of species composition on economic return.. Silva Fennica vol. 30 no. 1 article id 5574
Vettenranta J., Miina J. (1999) Optimizing thinnings and rotation of Scots pine .. Silva Fennica vol. 33 no. 1 article id 671
Vettenranta J., (1999) Distance-dependent models for predicting the dev.. Silva Fennica vol. 33 no. 1 article id 670