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Impact of shelterwood regeneration method on mechanical properties of scots pine wood

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Regeneration method effects within-stem variability of mechanical wood properties but has no impact on overall quality of Scots pine logs.

Abstract

In Central Europe, group shelterwood regeneration method relying on natural regeneration is generally considered as an approach that meets the criteria of close-to-nature silviculture. We tested its effect on wood properties in contrast to the clearcutting method with subsequent artificial regeneration by planting in the case of Scots pine (Pinus sylvestris L.). Four localities were chosen in the Czech Republic, where both regeneration methods were applied. Sample trees were felled and subsequently evaluated for the impact of the applied regeneration method on wood properties. Modulus of elasticity, bending strength and wood density were used as indicators of wood quality. The impact of the regeneration method on the examined characteristics of the wood was not statistically significant, 78 MPa (megapascal) for shelterwood and 75 MPa for clearcutting method in the case of bending strength, and they are of negligible importance in terms of influencing end-product potential. Much more significant was the impact of the applied regeneration method on the distribution of the properties along trunk radius, where the shelterwood method provides even distribution. Non-destructive methods turned out to be useful tools for elastic properties estimation of wood as the close correlation to modulus of elasticity was confirmed (r = 0.66 and r = 0.82 for shelterwood and clearcutting method, respectively).

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Acknowledgements

The authors are grateful to Forests of the Czech Republic, state enterprise, and Municipal forests of Doksy for kindly providing us with the testing material.

Funding

The research was supported by the Ministry of Agriculture of the Czech Republic [project number QJ1520037 – „Increasing the adaptability of pine (Pinus sylvestris L.) silviculture in the conditions of the Czech Republic “] and by Internal Grant Agency of the Faculty of Forestry and Wood Sciences [A03/18].

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Authors and Affiliations

  1. Faculty of Forestry and Wood Sciences, Department of Wood Processing and Biomaterials, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Prague, Czech Republic

    Aleš Zeidler, Vlastimil Borůvka & Ondřej Schönfelder

  2. Faculty of Forestry and Wood Sciences, Department of Silviculture, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Prague, Czech Republic

    Lukáš Bílek

  3. Faculty of Forestry and Wood Sciences, Department of Forest Ecology, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Prague, Czech Republic

    Jan Vítámvás

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  1. Aleš Zeidler
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  2. Vlastimil Borůvka
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Appendix

Appendix

See Tables 6, 7, 8, 9, 10 and 11.

Table 6 Tests of significance for dynamic modulus of elasticity
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Table 7 Duncan’s multiple range test for dynamic modulus of elasticity
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Table 8 Tests of significance for static modulus of elasticity
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Table 9 Duncan’s multiple range test for static modulus of elasticity
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Table 10 Tests of significance for bending strength
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Table 11 Duncan’s Multiple Range Test for Bending Strength
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Zeidler, A., Borůvka, V., Bílek, L. et al. Impact of shelterwood regeneration method on mechanical properties of scots pine wood. Trees 35, 1185–1198 (2021). https://doi.org/10.1007/s00468-021-02107-w

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