Quality in forest cutting operation in stands under two models of mechanized thinning
DOI:
https://doi.org/10.4336/2019.pfb.39e201801689Keywords:
Pinus taeda, Log, Mechanical harvestingAbstract
Technological evolution of wood harvesting machines has allowed the expansion of selective thinning areas in forest stands, with gains in productivity, but with risks to affect the work quality. In this context, the aim of this study was to evaluate the quality of harvesting operation in Pinus taeda stands under two thinning models: (1) systematic cutting of the fifth line and selective in adjacent lines, and (2) systematic cutting of the seventh line and selective in adjacent lines. Quality was evaluated by measuring stump height and logs length in assortments saw log, veneer log, and pulpwood. The values were analyzed by means of histograms and the averages were compared by pre-established dimensions through Wilcoxon´s test (α ≤ 0.05). It was verified that 90% of stump heights were above pre-established value, with means of 12.5 and 12.9 cm, resulting in wasted wood volume of 0.50 and 0.62 m3 ha-1 in thinning models 1 and 2, respectively. Length of saw log and veneer log in both thinning models were higher than expected, while values for pulpwood showed significant lower values when compared to the pre-established.
Downloads
References
Conaw, P. L. Estatística. São Paulo: Edgard Blucher, 1977. 264 p.
Dietz, H.-U. & Urbanke, B. Lastenheft Harvestervermessung: eine Projektarbeit des KWF. Groβ-Umstadt: Kuratorium für Waldarbeit und Forsttechnik, 2013.
Fiedler, N. C. et al. Análise da qualidade da colheita florestal de eucalipto em diferentes declividades. Científica Eletrônica de Engenharia Florestal, v. 22, n. 1, p. 1-8, 2013.
Indústria Brasileira de Árvores. Anuário estatístico do IBÁ: ano base 2016. São Paulo, 2017. 77 p. Disponível em: <http://iba.org/images/shared/Biblioteca/IBA_RelatorioAnual2017.pdf>. Acesso em: 30 mar. 2018.
Jacovine, L. A. G. et al. Avaliação da qualidade operacional em cinco subsistemas de colheita florestal. Revista Árvore, v. 29, n. 3, p. 391-400, 2005. DOI: 10.1590/S0100-67622005000300006.
Lopes, E. S. et al. Damage to residual trees following commercial thinning by harvester and forwarder in a Pinus taeda stand in Southern Brazil. Scientia Forestalis. v. 46, n. 118, p. 167-175, 2018. DOI: 10.18671/scifor.v46n188.03.
Lopes, E. S. et al. Efeito do sortimento da madeira na produtividade e custo do forwarder no desbaste comercial de Pinus taeda. Scientia Forestalis. v. 44, n. 109, p. 57-66, 2016. DOI: 10.18671/scifor.v44n109.05.
Malinovski, J. R. et al. Sistemas. In: Machado, C. C. (Ed.). Colheita florestal. 3. ed. Viçosa, MG: UFV, 2014. p. 178-205.
Malinovski, R. A. et al. Análise das variáveis de influência na produtividade das máquinas de colheita de madeira em função das características físicas do terreno, do povoamento e do planejamento operacional florestal. Floresta, v. 36, n. 2, p. 169-182, 2006. DOI: 10.5380/rf.v3i2.6459
Mangoyana, R. B. Bioenergy from forest thinning: carbon emissions, energy balances and cost analyses. Renewable Energy, v. 36, n. 9, p. 2368-2373, 2011. DOI: 10.1016/j.renene.2011.01.026.
Mederski, P. S. et al. Investigation of log length accuracy and harvester efficiency in processing of oak trees. Croatian Journal of Forest Engineering, v. 39, n. 2, p. 173-181, 2018.
Nieuwenhuis, M. & Dooley, T. The effect of calibration on the accuracy of harvester measurements. International Journal of Forest Engineering, v. 17, n. 2, p. 25-33, 2006.
Oliveira, G. S. et al. Análise técnica, econômica e da qualidade em primeiro desbaste mecanizado. Espacios, v. 38, n. 26, p. 1-5, 2017.
Pereira, D. P. et al. Avaliação da qualidade do corte florestal com motosserra. Cerne, v. 18, n. 2, p. 197-203, 2012. DOI: 10.1590/S0104-77602012000200003.
Rosa, M. O. & Oliveira, F. M. Análise da qualidade do processamento de madeira em dos sistemas mecanizados de colheita florestal. Revista da União Latino-americana de Tecnologia, n. 2, p. 19-37, 2014.
Schneider, R. & Schneider, P. Introdução ao manejo florestal. 2 ed. Santa Maria, RS: FACOS-UFSM, 2008. 566 p.
Serpe, E. L. et al. Coeficientes downgrade para sortimentos de toras de pinus. BIOFIX Scientific Journal, v. 3, n. 1, p. 116-121, 2018. DOI: 10.5380/biofix.v3i1.58056.
Spinelli, R. & Nati, C. A Low-investiment fully mechanised operation for pure selection thinning of pine plantations. Croation Journal of Forest Engineering, v. 2, n. 30, p. 89-97, 2009.
Stroher, R. R. et al. Avaliação da perda de madeira em dois sistemas de colheita florestal mecanizada. Enciclopédia Biosfera, v. 10, n. 19, p. 238-249, 2014.
Downloads
Published
How to Cite
Issue
Section
License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Pesquisa Florestal Brasileira (PFB) licenses all its published content under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0).
- Copyright: Authors maintain the copyright to their work. PFB holds the right to the first publication, and use rights under the specific Creative Commons deed.
- Editing and revision: PFB reserves the right to edit the original manuscript to ensure conformity with the standards, spelling and grammar of the Portuguese language, while respecting the style of the author(s). The final version of the text shall be sent to the corresponding author for approval prior to publication.
- Sharing and reuse: The CC BY-NC-ND 4.0 license permits sharing of the article in its original version, as long as credit is given to the journal and the authors and the material is not used for commercial purposes. No alterations or adaptations of the original content are permitted.
- Figures and illustrations: Figures and illustrations published in PFB may only be used with express prior authorization from Embrapa Forestry.
- Disclaimer: The opinions and beliefs expressed in the texts published herein are the exclusive responsibility of their respective authors and not PFB.
The originals texts published in Pesquisa Florestal Brasileira are provided under 