Modeling Productivity and Estimating Costs of Processor Tower Yarder in Shelterwood Cutting of Pine Stand
Cable-based yarding technology has had a long tradition on steep slopes in Europe, and the new implementation of yarding functions in recent decades favored operational efficiency and lower extraction costs. The main goal of this study was to evaluate the performance of the Syncrofalke 3t truck-moun...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-01-01
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| Series: | Forests |
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| Online Access: | https://www.mdpi.com/1999-4907/14/2/195 |
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| author | Salvatore F. Papandrea Stanimir Stoilov Georgi Angelov Tanya Panicharova Piotr S. Mederski Andrea R. Proto |
| author_facet | Salvatore F. Papandrea Stanimir Stoilov Georgi Angelov Tanya Panicharova Piotr S. Mederski Andrea R. Proto |
| author_sort | Salvatore F. Papandrea |
| collection | DOAJ |
| description | Cable-based yarding technology has had a long tradition on steep slopes in Europe, and the new implementation of yarding functions in recent decades favored operational efficiency and lower extraction costs. The main goal of this study was to evaluate the performance of the Syncrofalke 3t truck-mounted Processor Tower Yarder (PTY) on steep terrain, in coniferous forests managed with the shelterwood system. In particular, the aim was to determine PTY productivity and costs, with attention to parameters that could increase PTY effectiveness. The study was carried out in the Sredna Gora Mountains, Central Bulgaria, in pure Scots pine stand, with trees of average DBH = 34 cm and height = 22 m. The study was carried out in six corridors with 120 work cycles of tree extraction up the hill, 28° (53%). The mean productivity of PTY was 15.20 m<sup>3</sup> per productive machine hour (PMH) and 12.29 m<sup>3</sup> per scheduled machine hour (SMH) and was mainly influenced by the productivity of the yarder unit. Under the given conditions, the performance of PTY significantly increased if more than one tree (at least two trees) were attached and extracted per yarder cycle, since the productivity of the processor was approximately twice that of the yarder. The gross costs of the studied PTY were calculated at 297.48 EUR PMH<sup>−1</sup> and 16.17 EUR m<sup>−3</sup>. The variable costs (75%) predominate in the net costs distribution, followed by the fixed costs (15%) and the labor costs (10%). The time, productivity and cost results obtained showed the high efficiency and level of integration of PTY operations in order to achieve economic efficiency of logging in montane pine forest managed in a shelterwood system. |
| first_indexed | 2024-03-11T08:50:22Z |
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| institution | Directory Open Access Journal |
| issn | 1999-4907 |
| language | English |
| last_indexed | 2024-03-11T08:50:22Z |
| publishDate | 2023-01-01 |
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| series | Forests |
| spelling | doaj.art-f5ff50c4dee94c708b2ac47676d136542023-11-16T20:32:36ZengMDPI AGForests1999-49072023-01-0114219510.3390/f14020195Modeling Productivity and Estimating Costs of Processor Tower Yarder in Shelterwood Cutting of Pine StandSalvatore F. Papandrea0Stanimir Stoilov1Georgi Angelov2Tanya Panicharova3Piotr S. Mederski4Andrea R. Proto5Department of AGRARIA, Mediterranean University of Reggio Calabria, Feo di Vito snc, 89122 Reggio Calabria, ItalyDepartment of Technologies and Mechanization of Forestry, University of Forestry, Kliment Ohridski Blvd. 10, 1756 Sofia, BulgariaDepartment of Technologies and Mechanization of Forestry, University of Forestry, Kliment Ohridski Blvd. 10, 1756 Sofia, BulgariaDepartment of Technologies and Mechanization of Forestry, University of Forestry, Kliment Ohridski Blvd. 10, 1756 Sofia, BulgariaDepartment of Forest Utilisation, Faculty of Forestry and Wood Technology, Poznan University of Life Sciences (PULS), ul. Wojska Polskiego 71A, 60-625 Poznan, PolandDepartment of AGRARIA, Mediterranean University of Reggio Calabria, Feo di Vito snc, 89122 Reggio Calabria, ItalyCable-based yarding technology has had a long tradition on steep slopes in Europe, and the new implementation of yarding functions in recent decades favored operational efficiency and lower extraction costs. The main goal of this study was to evaluate the performance of the Syncrofalke 3t truck-mounted Processor Tower Yarder (PTY) on steep terrain, in coniferous forests managed with the shelterwood system. In particular, the aim was to determine PTY productivity and costs, with attention to parameters that could increase PTY effectiveness. The study was carried out in the Sredna Gora Mountains, Central Bulgaria, in pure Scots pine stand, with trees of average DBH = 34 cm and height = 22 m. The study was carried out in six corridors with 120 work cycles of tree extraction up the hill, 28° (53%). The mean productivity of PTY was 15.20 m<sup>3</sup> per productive machine hour (PMH) and 12.29 m<sup>3</sup> per scheduled machine hour (SMH) and was mainly influenced by the productivity of the yarder unit. Under the given conditions, the performance of PTY significantly increased if more than one tree (at least two trees) were attached and extracted per yarder cycle, since the productivity of the processor was approximately twice that of the yarder. The gross costs of the studied PTY were calculated at 297.48 EUR PMH<sup>−1</sup> and 16.17 EUR m<sup>−3</sup>. The variable costs (75%) predominate in the net costs distribution, followed by the fixed costs (15%) and the labor costs (10%). The time, productivity and cost results obtained showed the high efficiency and level of integration of PTY operations in order to achieve economic efficiency of logging in montane pine forest managed in a shelterwood system.https://www.mdpi.com/1999-4907/14/2/195forest operationscable extractionwood harvestingsteep terrain |
| spellingShingle | Salvatore F. Papandrea Stanimir Stoilov Georgi Angelov Tanya Panicharova Piotr S. Mederski Andrea R. Proto Modeling Productivity and Estimating Costs of Processor Tower Yarder in Shelterwood Cutting of Pine Stand Forests forest operations cable extraction wood harvesting steep terrain |
| title | Modeling Productivity and Estimating Costs of Processor Tower Yarder in Shelterwood Cutting of Pine Stand |
| title_full | Modeling Productivity and Estimating Costs of Processor Tower Yarder in Shelterwood Cutting of Pine Stand |
| title_fullStr | Modeling Productivity and Estimating Costs of Processor Tower Yarder in Shelterwood Cutting of Pine Stand |
| title_full_unstemmed | Modeling Productivity and Estimating Costs of Processor Tower Yarder in Shelterwood Cutting of Pine Stand |
| title_short | Modeling Productivity and Estimating Costs of Processor Tower Yarder in Shelterwood Cutting of Pine Stand |
| title_sort | modeling productivity and estimating costs of processor tower yarder in shelterwood cutting of pine stand |
| topic | forest operations cable extraction wood harvesting steep terrain |
| url | https://www.mdpi.com/1999-4907/14/2/195 |
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