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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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- Bergsten, Urban, et al.
(författare)
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Functional Products in Forestry: Challenges and Opportunities
- 2012
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Konferensbidrag (refereegranskat)abstract
- Worldwide, sustainable forestry requires a holistic view over the use of forests as a resource. However, there are no holistic business models to support sustainable forestry. Hence, there exist a potential to use new business models such as Functional Products. Based on a literature study, this paper highlights important challenges and opportunities regarding the use of the Functional Product concept in forestry, and assesses how to best fuse the two fields. The results indicate that there are opportunities to achieve win-win situations by introducing Functional Products in forestry.
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- Ersson, Back Tomas
(författare)
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Advances in the Mechanization of Regenerating Plantation Forests: a Review
- 2020
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Ingår i: Current Forestry Reports. - : Springer Science and Business Media LLC. - 2198-6436. ; 6, s. 143-158
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Forskningsöversikt (refereegranskat)abstract
- Purpose of Review The mechanization of silvicultural work on forest plantations is usually driven by a decreasing supply of motivated labour which increases its relative cost. Mechanization can also result in other advantages like increased effectiveness, higher efficiency, and improved working conditions. The purpose of our review is to examine the last few decades' endeavours to mechanize the regeneration activities of plantation forestry in the southern and northern hemisphere. In this case, regeneration activities include (1) site preparation; (2) tree planting; and (3) stand tending until the crop trees are free from vegetative competition. Recent Findings Originally, the mechanization of silvicultural work commenced in the northern hemisphere, but over the past decades, the most notable progress has been made in the southern hemisphere plantation forests. Although soil preparation is largely mechanized across the globe, tree planting and stand tending activities lag behind because of factors such as global variations in the manner in which they are performed, higher level of complexity, and low-cost competitiveness compared with existing labour-intensive methods. For mechanization of regeneration/silvicultural activities to progress, productive and adaptable machines will be required where economies of scale permit cost-efficient operations. These machines will probably have to be modified to the specific forestry context of different countries. Knowledge of the existing and state-of-the-art regeneration technologies available in both the northern and southern hemispheres is important for foresters to make informed decisions about the selection and application of mechanized regeneration systems.
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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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