Comparative Analysis of Sampling Systems in Thinned Pinus taeda L. Plantations
Abstract
The objective of this study was to compare the sampling methods of fixed area, Bitterlich, Strand, and Prodan distributed through random and systematic processes in a 6.3 hectare Pinus taeda L. plantation located in the municipality of Lages, in the state of Santa Catarina, subjected to selective and systematic thinning. A 100% inventory (forest census) was carried out, measuring the diameters at 1.3 meters above ground level (d) of all trees in the stand. Additionally, sampling systems (method + process) were designed to estimate the main population parameters (basal area - G, volume - V, and number of trees - N) per hectare. In the random process, the central coordinates (latitude and longitude) of the sample units were selected by random draw, while for the systematic process, only the central coordinate of the first unit was drawn, and the others were distributed at 100 meter intervals. Sampling errors were calculated, and an analysis of variance was performed for the variables G (m2·ha-1), V (m3·ha−1), and N (trees·ha−1) using a factorial arrangement design, considering the factors: sampling processes (systematic and random) and sampling methods (rectangular fixed area, circular fixed area, Bitterlich, Strand, and Prodan). The results of this study demonstrated that the interaction between the different sampling methods and the random and systematic processes did not result in significant differences. Significant differences were observed only in the volume (V) estimates generated by the random and systematic processes, with the estimates from the random process being closer to the parametric value.
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Stepka, T. F.; Heberle, T.; Oliveira, H. G. B. D.; Freisleben, M. J.; Demétrio, L.; Oliveira, G. L.; Wolff, L. D. O.; Lisboa, G. D. S. (2025). Comparative Analysis of Sampling Systems in Thinned Pinus taeda L. Plantations. TreeDimensional Journal, 15(e025046), 1-9. https://doi.org/10.55746/treed.2023.05.046.
@article{stepka2025,
title={Comparative Analysis of Sampling Systems in Thinned Pinus taeda L. Plantations},
author={Stepka, Thiago Floriani and Heberle, Thaila and Oliveira, Huga Géssica Bento de and Freisleben, Maurício Jean and Demétrio, Laryssa and Oliveira, Geórgia Levorse and Wolff, Leandro de Oliveira and Lisboa, Gerson dos Santos},
journal={TreeDimensional Journal},
year={2025},
volume={15},
number={e025046},
pages={1-9},
doi={10.55746/treed.2023.05.046}
}TY - JOUR AU - Stepka, Thiago Floriani AU - Heberle, Thaila AU - Oliveira, Huga Géssica Bento de AU - Freisleben, Maurício Jean AU - Demétrio, Laryssa AU - Oliveira, Geórgia Levorse AU - Wolff, Leandro de Oliveira AU - Lisboa, Gerson dos Santos TI - Comparative Analysis of Sampling Systems in Thinned Pinus taeda L. Plantations JO - TreeDimensional Journal PY - 2025 VL - 15 IS - e025046 SP - 1 EP - 9 DO - 10.55746/treed.2023.05.046 AB - The objective of this study was to compare the sampling methods of fixed area, Bitterlich, Strand, and Prodan distributed through random and systematic processes in a 6.3 hectare Pinus taeda L. plantation located in the municipality of Lages, in the state of Santa Catarina, subjected to selective and systematic thinning. A 100% inventory (forest census) was carried out, measuring the diameters at 1.3 meters above ground level (d) of all trees in the stand. Additionally, sampling systems (method + process) were designed to estimate the main population parameters (basal area - G, volume - V, and number of trees - N) per hectare. In the random process, the central coordinates (latitude and longitude) of the sample units were selected by random draw, while for the systematic process, only the central coordinate of the first unit was drawn, and the others were distributed at 100 meter intervals. Sampling errors were calculated, and an analysis of variance was performed for the variables G (m2·ha-1), V (m3·ha−1), and N (trees·ha−1) using a factorial arrangement design, considering the factors: sampling processes (systematic and random) and sampling methods (rectangular fixed area, circular fixed area, Bitterlich, Strand, and Prodan). The results of this study demonstrated that the interaction between the different sampling methods and the random and systematic processes did not result in significant differences. Significant differences were observed only in the volume (V) estimates generated by the random and systematic processes, with the estimates from the random process being closer to the parametric value. KW - Forest Inventory KW - Sampling method KW - Sampling process KW - Census. ER -
Stepka, T. F.; Heberle, T.; Oliveira, H. G. B. D.; Freisleben, M. J.; Demétrio, L.; Oliveira, G. L.; Wolff, L. D. O.; Lisboa, G. D. S. (2025). Comparative Analysis of Sampling Systems in Thinned Pinus taeda L. Plantations. TreeDimensional Journal, 15(e025046), 1-9. https://doi.org/10.55746/treed.2023.05.046. Import via Mendeley Web Importer using DOI 10.55746/treed.2023.05.046
Add to Zotero using DOI 10.55746/treed.2023.05.046 Stepka, T. F.; Heberle, T.; Oliveira, H. G. B. D.; Freisleben, M. J.; Demétrio, L.; Oliveira, G. L.; Wolff, L. D. O.; Lisboa, G. D. S. (2025). Comparative Analysis of Sampling Systems in Thinned Pinus taeda L. Plantations. TreeDimensional Journal, 15(e025046), 1-9. https://doi.org/10.55746/treed.2023.05.046.
Stepka, T. F.; Heberle, T.; Oliveira, H. G. B. D.; Freisleben, M. J.; Demétrio, L.; Oliveira, G. L.; Wolff, L. D. O.; Lisboa, G. D. S. (2025). Comparative Analysis of Sampling Systems in Thinned Pinus taeda L. Plantations. TreeDimensional Journal, 15(e025046), 1-9. https://doi.org/10.55746/treed.2023.05.046.