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Timo Pukkala (email), Jari Miina, Marc Palahí

Thinning response and thinning bias in a young Scots pine stand

Pukkala T., Miina J., Palahí M. (2002). Thinning response and thinning bias in a young Scots pine stand. Silva Fennica vol. 36 no. 4 article id 524. https://doi.org/10.14214/sf.524

Abstract

The study analyses the annual post-thinning response and thinning bias of a young Scots pine stand as a function of tree size, competition faced by the tree, and competition that is removed around the tree in the thinning treatment. The thinning response of a tree was defined as the change of tree growth due to a thinning treatment. The thinning bias was defined as the difference between the true growth and model prediction. A distance-dependent (spatial) and a distance-independent (non-spatial) growth model were used in the calculations. The empirical data were measured from a thinning experiment consisting of ten plots, each 40 x 30 m in size, which were thinned to different stand densities. The ten-year post-thinning growth of every remaining tree was measured. The results indicated that the highest thinning response is among medium-sized and co-dominant trees. The thinning response is quite small, and even negative for some trees, for two years after thinning but it becomes clearly positive from the third year onwards. The spatial model underestimated the growth of small trees (which usually face high competition) while the non-spatial model overestimated the growth of trees that are small or face much competition. The spatial model used in this study overemphasized the effect of competition while the non-spatial model underestimated this effect. Both growth models overestimated the growth of trees in heavily thinned places, but this bias disappeared in two years. The negative bias was more pronounced with a spatial growth model because the tendency of the non-spatial model to underestimate the growth of trees facing little competition partly compensated for the negative bias.

Keywords
Pinus sylvestris; growth model; non-spatial model; spatial model

Author Info
  • Pukkala, University of Joensuu, Faculty of Forestry, P.O. Box 111, FIN-80101 Joensuu, Finland E-mail timo.pukkala@joensuu.fi (email)
  • Miina, Finnish Forest Research Institute, Joensuu Research Centre, P.O. Box 68, FIN-80101 Joensuu, Finland E-mail jm@nn.fi
  • Palahí, European Forest Institute, Torikatu 34, FIN-80100 Joensuu, Finland E-mail mp@nn.fi

Received 3 October 2001 Accepted 29 May 2002 Published 31 December 2002

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Available at https://doi.org/10.14214/sf.524 | Download PDF

Creative Commons License CC BY-SA 4.0

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Hänninen H., Kellomäki S. et al. (1996) Overwintering and productivity of Scots pine in .. Silva Fennica vol. 30 no. 2–3 article id 5590
Hynynen J., (1995) Predicting the growth response to thinning for S.. Silva Fennica vol. 29 no. 3 article id 5559
Miina J., (1994) Spatial growth model for Scots pine on drained p.. Silva Fennica vol. 28 no. 1 article id 5525
Peltola H., Kellomäki S. (1993) A mechanistic model for calculating windthrow an.. Silva Fennica vol. 27 no. 2 article id 5504
Pukkala T., Karsikko J. et al. (1992) A spatial model for the diameter of thickest bra.. Silva Fennica vol. 26 no. 4 article id 5490
Varmola M., (1989) A model for ring width of planted Scots pine Silva Fennica vol. 23 no. 4 article id 5388
Pukkala T., (1989) Predicting diameter growth in even-aged Scots pi.. Silva Fennica vol. 23 no. 2 article id 5376
Hänninen H., Pelkonen P. (1988) Effects of temperature on dormancy release in No.. Silva Fennica vol. 22 no. 3 article id 5357
Pukkala T., (1988) Effect of spatial distribution of trees on the v.. Silva Fennica vol. 22 no. 1 article id 5338
Pukkala T., (1987) Model for predicting the seed crop of Picea abie.. Silva Fennica vol. 21 no. 2 article id 5311
Kellomäki S., Hänninen H. et al. (1987) A tentative model for describing the effects of .. Silva Fennica vol. 21 no. 1 article id 5302
Kärkkäinen M., (1986) Model of knottiness of wood material in pine, sp.. Silva Fennica vol. 20 no. 2 article id 5266
Haapanen T., Hari P. et al. (1979) Effect of fertilization and thinning on radial g.. Silva Fennica vol. 13 no. 2 article id 5033
Päivänen J., (1973) The effect of thinning on the snow cover and soi.. Silva Fennica vol. 7 no. 2 article id 4881
Nikinmaa E., (1992) Analyses of the growth of Scots pine: matching s.. Acta Forestalia Fennica vol. 0 no. 235 article id 7681
Saramäki J., (1992) A growth and yield prediction model of Pinus kes.. Acta Forestalia Fennica vol. 0 no. 230 article id 7676
Kuehne C., McLean J. P. et al. (2022) A stand-level growth and yield model for thinned.. Silva Fennica vol. 56 no. 1 article id 10627
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
Niemistö P., Kilpeläinen H. et al. (2018) Effect of first thinning type and age on growth,.. Silva Fennica vol. 52 no. 2 article id 7816
Egbäck S., Nilsson U. et al. (2017) Modeling early height growth in trials of geneti.. Silva Fennica vol. 51 no. 3 article id 5662
Ikonen V.-P., Kellomäki S. et al. (2009) Sawn timber properties of Scots pine as affected.. Silva Fennica vol. 43 no. 3 article id 197
Huuskonen S., Hynynen J. et al. (2008) Stand characteristics and external quality of yo.. Silva Fennica vol. 42 no. 3 article id 245
Huuskonen S., Hynynen J. (2006) Timing and intensity of precommercial thinning a.. Silva Fennica vol. 40 no. 4 article id 320
Kojola S., Penttilä T. et al. (2004) Impacts of different thinning regimes on the yie.. Silva Fennica vol. 38 no. 4 article id 407
Varmola M., Salminen H. et al. (2004) Thinning response and growth trends of seeded Sc.. Silva Fennica vol. 38 no. 1 article id 436
Aalto T., Hari P. et al. (2002) Comparison of an optimal stomatal regulation mod.. Silva Fennica vol. 36 no. 3 article id 529
Aalto T., (1998) Carbon dioxide exchange of Scots pine shoots as .. Silva Fennica vol. 32 no. 4 article id 674