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- Berg, Simon, et al.
(författare)
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Distance driven and driving speed when forwarding during final felling in Central Sweden
- 2019
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Ingår i: Journal of Forest Science. - 1212-4834 .- 1805-935X. ; 65, s. 183-194
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Tidskriftsartikel (refereegranskat)abstract
- Factors affecting forwarding work are interesting because they can be used to better optimize forwarding routes and to predict costs. The main objective of this study was to investigate the association between driving speed and driving distance when forwarding. Data was automatically collected during 2.5 years from two large forwarders operating during final felling in central Sweden. Driving speeds for the work tasks Driving unloaded, Loading drive and Driving loaded were analysed using correlation, least-squares regression, and quantile regression. The results showed that speed and distance were strongly correlated for the work element Driving unloaded, while the correlation was weaker for Loading drive and Driving loaded. Possible factors leading to these results are as follows: longer travelling distances stimulate better planning and the establishment of better extraction roads; operators may feel stressed and drive faster as travelling distance increases; and finally, the relative influence of accelerations and decelerations decreases with increasing driving distance. Also, the use of quantile regression was successful and provided information that normal least-squares regression does not provide.
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- Ersson, Back Tomas, et al.
(författare)
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Aerial seeding of forests in Russia: A selected literature analysis
- 2019
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Ingår i: IOP Conference Series: Earth and Environmental Science. - : IOP Publishing. - 1755-1307 .- 1755-1315. ; 226
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Konferensbidrag (refereegranskat)abstract
- The study is intended for international readers or those unable to read Russian. Information search was carried out in Russian-language databases (Russian libraries and ELibrary.ru) and English-language databases. . Currently, there are a large number of sites in the Russian forests that need to be restored. For many of them, reforestation by ground-based seeding or planting is inefficient or not available. Sowing forest from the air in Russia has more than half a century of history. The results of retrospective analysis show that the choice of the reforestation method depends on the site characteristics and the level of negative environmental impact. Generally, the cost of aerial seeding on such sites with unmanned aerial vehicles (UAV) is lower compared to the use of manned aerial vehicles (MAV). This study will aid in the planning of new forestry experiments to study reforestation with the assistance of natural reforestation in Russia. The study will enable correct plant propagation protocols for sustainable forest management. However, many questions remained unresolved: what types of UAV and sowing apparatus to use; how to position the UAV under a forest canopy?
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- Ersson, Back Tomas
(författare)
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Mechanized Tree Planting in Sweden and Finland: Current State and Key Factors for Future Growth
- 2018
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Ingår i: Forests. - : MDPI AG. - 1999-4907. ; 9
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Tidskriftsartikel (refereegranskat)abstract
- In Fennoscandia, mechanized tree planting is time-efficient and produces high-quality regeneration. However, because of low cost-efficiency, the mechanization of Fennoscandian tree planting has been struggling. To determine key factors for its future growth, we compared the operational, planning, logistical, and organizational characteristics of mechanized planting in Sweden and Finland. Through interviews with planting machine contractors and client company foresters, we establish that mechanized tree planting in Sweden and Finland presently shares more similarities than differences. Some notable differences include typically longer planting seasons in Sweden, and a tendency towards two-shift operation and less frequent worksite pre-inspection by contractors in Finland. Because of similar challenges, mechanized planting in both countries can improve cost-efficiency through education of involved foresters, flexible information systems, efficient seedling logistics, and continued technical development of planting machines. By striving to have multiple client companies, contractors can reduce their operating radii and increase their machine utilization rates. Above all, our results provide international readers with unprecedented detailed and comprehensive figures and characteristics of Swedish and Finnish mechanized tree-planting activities. We conclude that cooperation between Sweden's and Finland's forest industries and research institutes could enhance the mechanization level of Fennoscandian tree planting.
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