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33. Environmental impacts of boom-corridor and selectively thinned small-diameter-tree forestsTeresa de la Fuente, Dan Bergström, Raul Fernandez-Lacruz, Teppo Hujala, Nike Krajnc, Ruben Laina, Tomas Nordfjell, Matevž Triplat, Eduardo Tolosana, 2022, izvirni znanstveni članek Povzetek: European forest stands of small-diameter trees can provide industries with biomass as an alternative to fossil use. Small-tree harvesting is costly using conventional methods but using accumulating felling heads (AFH) in combination with a novel boom-corridor thinning (BCT) technique can increase harvester productivity and supply cost efficiency. This method has great potential to reduce costs, but its environmental impact compared with selective thinning (ST) needs to be determined. The objectives of this study were therefore to quantify and compare tree and soil damage as well as air, water and soil emissions for both BCT and ST in various European small-diameter-tree forests. Trials were performed in 84 study units (42 replications per thinning technique) across four countries. Damaged trees (with a diameter at breast height ≥ 7 cm) were measured after thinning and after forwarding. Harvesting emissions were calculated from a life cycle assessment. The percentage of remaining trees that had been damaged by the harvesting processes was 13% and 19% for BCT and ST, respectively, and the difference was significant. BCT exhibited the lowest emissions in all environmental impact categories considered, in all countries. Greenhouse gas emissions were on average 17% lower for BCT. BCT in small-diameter-tree stands therefore reduces the environmental impact of thinning operations compared with conventional methods, and results in less damage to the remaining trees.
Ključne besede: first thinning, harvesting damages, GHG emissions, forest biomass, forest operations
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34. Private forest owner's cooperation in the machinery ring : is it a solution for wood mobilization from small-scale private forests?Špela Pezdevšek Malovrh, Nike Krajnc, Matevž Triplat, 2022, izvirni znanstveni članek Povzetek: Legislation and policy makers have recognized private forest owners cooperation in machinery ring as an instrument to support wood mobilization through efficient use of machinery. The study analyzes private forest owner’s cooperation in the machinery ring in Slovenia and determines whether this cooperation contributes to wood mobilization from small-scale private forests. The research was conducted in two phases. In the first phase, the survey was conducted among the members of machinery rings at their annual general meetings (24 machinery rings participated in the survey, representing 64.9% of the total number of machinery rings). The questionnaire was distributed to all members present at the annual general meetings (n=529) and only those who were private forest owner or provided services within machinery rings were eligible to complete the questionnaire (n=438). In the second phase, data on the amount of service provided by machinery ring members were compared with the amount of felling in private forests for 2019 to gain insight into the extend of forestry work (timber harvesting) carried out in a private forest under neighbourhood assistance.The results show that machinery rings members are predominantly male, on average 50 years old, mainly with high school education and occupation in agriculture, owning on average 15.2 ha of forest. Regardless of forest management activities, machinery ring members perform forest management activities in their forest by themselves or with the help of family members. Only a small proportion of members use neighbourhood assistance to carry out the work. This most often occurs in the transport of timber. A very small proportion of members provide forest services through the machinery ring, but their scope of services is not insignificant. In 2019, machinery ring members most often performed harvesting activities with the chain saw, followed by timber skidding as a service. Equipment with machinery for providing services is good among members – about three quarters of them have a chainsaw and an adapted agricultural tractor, but this machinery is quite old, showing that machinery is insufficiently used for forestry operations. The results show that machinery rings are nowadays an essential part of strategic (operational) management in Slovenian agriculture and forestry, and provide important insights into the possibilities to improve forestry operations and the future development cooperation between private forest owners in machinery rings to support wood mobilization from small-scale private forests.
Ključne besede: private forest management, harvesting intensity, cooperation, machinery cooperation, neighbourhood assistance
Objavljeno v DiRROS: 25.04.2022; Ogledov: 553; Prenosov: 404
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35. Effects of boom-corridor thinning on harvester productivity and residual stand structureDan Bergström, Raul Fernandez-Lacruz, Teresa de la Fuente, Christian Höök, Nike Krajnc, Jukka Malinen, Yrjö Nuutinen, Matevž Triplat, Tomas Nordfjell, 2022, izvirni znanstveni članek Povzetek: Biomass derived from small-diameter, dense, thinning stands is largely underutilized within the European Union, mainly because of in-effective harvesting methods and cutting technology, leading to high supply costs. Therefore, the efficacy of boom-corridor thinning (BCT) and selective thinning (ST) on harvester felling and bunching productivity was compared for the first thinning of whole tree biomass in small-diameter, dense stands. BCT working method is when trees are cut with linear movements of the harvester’s boom reach, along narrow corridors, instead of cutting each tree selectively (ST). Trials were performed in six forest stands, one in Sweden, two in Finland, and three in Slovenia, using the same harvester and operator. A time-and-motion study was carried out in 64 pre-marked study units (32 replications per method), across a variety of stand conditions. The biomass removal for both treatments averaged 40.2 dry t ha -1 and BCT productivity averaged 5.4 dry t PMh -1. For BCT, harvester work time consumption (sec tree -1) and productivity (dry t PMh -1) were on average 27% lower and 16% higher, respectively, compared with ST. The effectiveness of the accumulating felling head technology used could potentially be increased by implementing a feed-roller system when handling excessive tree lengths. Developing dedicated harvesting technology for BCT could further boost productivity, facilitating cost-effective and sustainable utilization of low-value small-diameter tree biomass and replacing fossil resources.
Ključne besede: bioenergy, accumulating felling head, multi-tree handling, silviculture, bioeconomy, forestry
Objavljeno v DiRROS: 20.04.2022; Ogledov: 539; Prenosov: 384
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36. Predlog normativov za prevoz okroglega lesa s tovornjaki družbe SiDG : osnutek poročilaMatevž Triplat, Urban Žitko, Mirko Baša, 2020, elaborat, predštudija, študija Ključne besede: okrogli les, prevoz lesa, državni gozdovi, proizvodnja lesa, normativi
Objavljeno v DiRROS: 15.04.2022; Ogledov: 611; Prenosov: 0 |
37. Strokovne podlage za avtomatizirano spremljanje gozdne proizvodnje v družbi SiDGMatevž Triplat, Urban Žitko, Matevž Mihelič, Mirko Baša, Nike Krajnc, 2020, elaborat, predštudija, študija Ključne besede: gozdovi, gozdarstvo, avtomatizacija, gozdna proizvodnja, avtomatizirano spremljanje, digitalizacija, spravilo lesa, prevoz lesa, sečnja, strojna sečnja
Objavljeno v DiRROS: 08.04.2022; Ogledov: 545; Prenosov: 0 |
38. Recenzija začasnih normativov spravila lesa z zgibnimi traktorji z vitlom in prevoza lesa s tovornjakiBoštjan Košir, Matevž Triplat, Matevž Mihelič, Nike Krajnc, 2019, elaborat, predštudija, študija Ključne besede: gozdovi, gozdarstvo, normativi, gozdna proizvodnja, gozdarska dela, spravilo lesa, prevoz lesa, zgibni traktorji, tovornjaki
Objavljeno v DiRROS: 08.04.2022; Ogledov: 562; Prenosov: 0 |
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40. Predlog kriterijev za izbor izvajalcev za okvirni sporazum : "Storitve sečnje in spravila lesa v gozdovih, ki so last Republike Slovenije" za obdobje od sklenitve sporazuma do 31.12.2019Nike Krajnc, Matevž Triplat, 2018, elaborat, predštudija, študija Ključne besede: gozdovi, gozdarstvo, gozdna proizvodnja, izvajalci del v gozdovih, sečnja, spravilo lesa, državni gozdovi
Objavljeno v DiRROS: 08.04.2022; Ogledov: 547; Prenosov: 0 |
