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Underröjningsgradens påverkan på förstagallringsnetto med flerträdsaggregat
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
2015 (Swedish)Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesisAlternative title
Effects of pre-commercial thinning with multi-grip harvester on first thinning net value (English)
Abstract [sv]

I Sverige finns ca 1,2 miljoner hektar skog som bedöms ha omedelbart röjningsbehov. Skog där röjningen uteblir eller är svag kan komma att klassas som konfliktbestånd. I konfliktbestånd är stammarna många och diameterspridningen stor och dessa kan då behövas underröjas innan gallring. I denna studie jämfördes produktionen, kostnaderna och intäkterna från fyra olika underröjningsbehandlingar, oröjd, siktröjt, röjt allt upp till 5 cm i brösthöjd och röjt allt upp till 7 cm i brösthöjd. Behandlingen oröjd gav det bästa nettot och sämst hade upp till 5 cm efter gallring och uttransport av virke. En anpassad eller svag röjning gav lägre totalkostnader jämfört med ingen eller hårdare röjning.

Abstract [en]

In Sweden there are about 1,2 million hectares of forest with immediate need of pre-commercial thinning. Stands, where conducted pre-commercial thinning are light or even absent, become tight with thin stems. In such stands pre-commercial thinning before first thinning may be required, due to operational advantages such as increased visibility. This study compared production, cost and revenues from four different pre-commercial thinning treatments: no pre-commercial thinning, sight pre-commercial thinning, cleared everything up to 5 cm diameter at breast height and cleared everything up to 7 cm diameter at breast height. The treatments whit no pre-commercial thinning had best net value and worst had up to 5 cm. A custom or weak pre-commercial thinning give a lower total cost compared to no or harder pre-commercial thinning.

Place, publisher, year, edition, pages
2015. , p. 36
Keywords [en]
first thinning, pre-commercial thinning, undergrowth, first thinning net value, multi-tree harvesting, rough delimbed pulpwood
Keywords [sv]
förstagallring, underröjning, underväxt, förstagallringsnetto, flerträdsaggregat, delkvistat
National Category
Forest Science
Identifiers
URN: urn:nbn:se:lnu:diva-40691OAI: oai:DiVA.org:lnu-40691DiVA, id: diva2:794120
Subject / course
Skogs- och träteknik
Educational program
Forest Production and Wood utilization Programme, 180 credits
Supervisors
Examiners
Available from: 2015-03-11 Created: 2015-03-10 Last updated: 2015-03-11Bibliographically approved

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Department of Forestry and Wood Technology
Forest Science

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CiteExportLink to record
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Citation style
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