Bergström, Dan

Ersson, Back Tomas

English

Epsilon Open Archive

NIBIO BOOK  | 5 (6) 2019Forest Operations in Response to Environmental ChallengesProceedings of the Nordic-Baltic Conference on Operational Research (NB-NORD),  June 3-5 2019, Honne, NorwaySimon Berg & Bruce Talbot (eds.)The basis of bioeconomy is the utilization and management of marine and terrestrial biological resources. The institute is to contribute to food security and safety, sustainable resource management, innovation, and value creation through research and knowledge production within food, forestry, and other bio-based industries. NIBIO delivers research, managerial support, and knowledge for use in national preparedness, as well as for businesses and the society at large. NIBIO is to become the leading national center for the development of knowledge within the field of bioeconomy.NIBIO is owned by the Ministry of Agriculture and Food as an administrative agency with special authorization and its own supervisory board. The main office is located at Ås, just outside Oslo. The institute has several regional units and a departmental office in Oslo.The Norwegian Institute of Bioeconomy Research (NIBIO) was founded on July 1st 2015 as a fusion of the Norwegian Institute for Agricultural and Environmental Research (Bioforsk),  Norsk institutt for landbruksøkonomisk forskning (NILF), and the Norwegian Forest and Landscape Institute.NIBIO Department of Forest management and technology, Norwaywww.nibio.no Twitter: @NIBIO-no / Facebook: @Nibio.no Forest Operations in Response to Environmental Challenges       Proceedings of the Nordic‐Baltic Conference on Operational Research (NB‐NORD) June 3‐5 2019, Honne, Norway          Supported by Nordic Forest Research, SNS 75 Forest Operations in Response to Environmental Challenges NIBIO BOK 5(6)2019  6.6 Why are undergrowth trees still pre‐cleared before first thinning operations? Bergström D.*1, Ersson B.T.2 1Swedish University of Agricultural Sciences (SLU), Department of Forest Biomaterials and Technology, 901 83 Umeå, Sweden, 2Swedish University of Agricultural Sciences (SLU), School of Forest Management, 739 21 Skinnskatteberg, Sweden *Corresponding author: dan.bergstrom@slu.se Keyword: Abstract Pre-clearing undergrowth trees is intended to increase the operational efficiency during first thinning. Currently, the main problem with undergrowth is the occurrence of sight-hindering trees (generally small spruce trees) which makes positioning the harvester head time consuming. Larger undergrowth trees may also increase time consumption when repositioning the head, because the head’s travelling distance may increase when the shortest distance between harvested trees is hindered. Hence, pre-clearing is justified by the forest industry because it facilitates reduced costs during the cutting work. However, pre-clearing is also very costly, and several studies indicate that pre-clearance often results in higher total thinning cost. Besides, with today’s technology, it is possible to support operator vision and to clear-away (or cut and accumulate) those trees that block the harvester head from travelling the shortest possible path between harvested trees. The objective of our study is to assess (using knowledge from several recent studies) the effect of undergrowth trees on the harvester’s thinning efficiency and cost, and, using up-to-date pre-clearance costs, analyze the systems’ total costs. Using current literature, we also aim to assess those technologies and methods that might eliminate the need for pre-clearance, while still maintaining high operational cost-efficiency during first-thinning cutting work. Our goal is to present possible solutions for practical implementation during first thinning. Preliminary results will be presented at the conference. 

Why are undergrowth trees still pre-cleared before first thinning operations?

https://pub.epsilon.slu.se/19136/1/bergstrom_d_et_al_201209.pdf

Why are undergrowth trees still pre-cleared before first thinning operations?

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