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

Jouni Vettenranta (email), Jari Miina

Optimizing thinnings and rotation of Scots pine and Norway spruce mixtures

Vettenranta J., Miina J. (1999). Optimizing thinnings and rotation of Scots pine and Norway spruce mixtures. Silva Fennica vol. 33 no. 1 article id 671. https://doi.org/10.14214/sf.671

Abstract

The study describes a simulation-optimization system which uses spatial models for diameter and height growth, crown ratio and tree mortality for Scots pine and Norway spruce mixtures. The optimal one- and two-thinning regimes of six initial stands with varing species composition were solved by using nonlinear optimization. The soil expectation value (SEV) at 3% interest rate was used as a management objective. The regimes are determined by taking into account the stand basal areas before the thinnings, the removal percentages for small, medium-sized and large pines and spruces, and the stand basal area before the final felling. The greatest SEV (8900 FIM ha–1) was attained with the initial stand where the proportion of pines was 65% of the number of the stems. In the two-thinning regime, the first thinning was conducted at the age of 39 years when the stand basal area was 37 m2 ha–1 and the dominant height was about 15 m. After the thinning, the basal area was 27 m2 ha–1. Spruces were thinned from below, but both small and large pines were removed. The second thinning was 8 years later and much heavier: the stand basal area was decreased from 35 m2 ha–1 to 18 m2 ha–1 by removing both small and large pines and spruces. When the optimal two-thinning regime was compared to the regime presented by Forest Centre Tapio, the loss of SEV was about 30% (6070 FIM ha–1) in the case of thinnings from below, and about 20% (7250 FIM ha–1) in the case of thinnings from above.

Keywords
mixed forests; optimal treatments; simulation models; Hooke and Jeeves’ method; thinning types

Author Info
  • Vettenranta, Kivirinnanpolku 4, FIN-40950 Muurame, Finland E-mail vettenr@cc.joensuu.fi (email)
  • Miina, Faculty of Forestry, University of Joensuu, P.O. Box 111, FIN-80101 Joensuu, Finland E-mail jm@nn.fi

Received 17 August 1998 Accepted 19 February 1999 Published 31 December 1999

Views 1989

Available at https://doi.org/10.14214/sf.671 | Download PDF

Creative Commons License CC BY-SA 4.0

Register
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
Hökkä H., Alenius V. et al. (1997) Individual-tree basal area growth models for Sco.. Silva Fennica vol. 31 no. 2 article id 5616
Maltamo M., (1997) Comparing basal area diameter distributions esti.. Silva Fennica vol. 31 no. 1 article id 5609
Vettenranta J., (1996) Effect of species composition on economic return.. Silva Fennica vol. 30 no. 1 article id 5574
Koistinen E., Valkonen S. (1993) Models for height development of Norway spruce a.. Silva Fennica vol. 27 no. 3 article id 5510
Hänninen H., Pelkonen P. (1988) Effects of temperature on dormancy release in No.. Silva Fennica vol. 22 no. 3 article id 5357
Kärkkäinen M., (1986) Value relations of Scots pine and Norway spruce .. Silva Fennica vol. 20 no. 2 article id 5267
Kärkkäinen M., (1986) Model of knottiness of wood material in pine, sp.. Silva Fennica vol. 20 no. 2 article id 5266
Yli-Vakkuri P., (1960) Snow cover and ground frost in Finnish forests Acta Forestalia Fennica vol. 71 no. 5 article id 7114
Rummukainen U., (1954) Estimation of Scots pine and Norway spruce cone .. Acta Forestalia Fennica vol. 61 no. 20 article id 7432
Jetsonen J., Laurén A. et al. (2024) Effects of nitrogen fertilization on the ground .. Silva Fennica vol. 58 no. 1 article id 23058
Goude M., Nilsson U. et al. (2022) Comparing basal area growth models for Norway sp.. Silva Fennica vol. 56 no. 2 article id 10707
Repola J., Hökkä H. et al. (2018) Models for diameter and height growth of Scots p.. Silva Fennica vol. 52 no. 5 article id 10055
Becker H., Aosaar J. et al. (2018) Annual net nitrogen mineralization and litter fl.. Silva Fennica vol. 52 no. 4 article id 10013
Fahlvik N., Ekö P. M. et al. (2015) Effects of precommercial thinning strategies on .. Silva Fennica vol. 49 no. 3 article id 1302
Repola J., Ahnlund Ulvcrona K. (2014) Modelling biomass of young and dense Scots pine .. Silva Fennica vol. 48 no. 5 article id 1190
Pukkala T., Hokkanen T. et al. (2010) Prediction models for the annual seed crop of No.. Silva Fennica vol. 44 no. 4 article id 131
Stendahl J., Johansson M.-B. et al. (2010) Soil organic carbon in Swedish spruce and pine f.. Silva Fennica vol. 44 no. 1 article id 159
Heikkilä J., Sirén M. et al. (2009) Energy wood thinning as a part of stand manageme.. Silva Fennica vol. 43 no. 1 article id 220
Kankaanhuhta V., Saksa T. et al. (2009) Variation in the results of Norway spruce planti.. Silva Fennica vol. 43 no. 1 article id 217
Rautiainen M., Mõttus M. et al. (2008) Crown envelope shape measurements and models Silva Fennica vol. 42 no. 1 article id 261
Repola J., (2006) Models for vertical wood density of Scots pine, .. Silva Fennica vol. 40 no. 4 article id 322
Kangas A., Maltamo M. (2000) Percentile based basal area diameter distributio.. Silva Fennica vol. 34 no. 4 article id 619
Vettenranta J., (1999) Distance-dependent models for predicting the dev.. Silva Fennica vol. 33 no. 1 article id 670
Gaitnieks T., Brauners I. et al. (2018) Infection of pre-commercially cut stumps of P.. Silva Fennica vol. 52 no. 1 article id 9911
Fedorkov A., (2001) Climatic adaptation of seed maturity in Scots pi.. Silva Fennica vol. 35 no. 1 article id 609