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Diameter, höjd och stamantal före och efter krankorridorgallring i ett sydsvenskt tallbestånd
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
2018 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Diameter, height and number of stems before and after boom-corridor thinning in a Scots pine-stand in southern Sweden (English)
Abstract [sv]

Med växande arealer som inte röjs, samt ett ökat intresse för skogsbränsleuttag, krävs utveckling av teknik och metoder för att kunna utvinna denna resurs. Genom att, från uppställningsplatser i stickväg, avverka träd i krankorridorer minskar antalet kranrörelser per träd. Detta minskar i sin tur den höga avverkningskostnaden i stamtäta, klena bestånd. I ett tallbestånd i södra Sverige undersöktes metoden krankorridorgallring. I transekter vinkelrätt från stickväg mättes höjd, brösthöjdsdiameter, stubbdiameter, stamantal, trädslagsblandning, stubbhöjder och skador, samt dess stickvägsavstånd. Detta beräknades sedan i Excel. Gallringskvoten var på 0,77, alltså ökade beståndets medeldiameter och höjd. Gallringsstyrkan låg på 53% med 61% avverkade träd i krankorridorer, resten i stickväg. Andelen skador var 1.5% och stubbhöjden 48 cm, inga av dessa kunde korreleras till stickvägsavståndet. Innan åtgärd stod endast 2267 stammar >3cm per hektar, bestånd med högre stamantal behövs för en bättre utvärdering av metoden.

Abstract [en]

With a growing number of unmanaged stands with a high number of stems per hectare and low diameters, and with growing interests in biomass extractions for fuel, development of proper technology and methods to extract these resources is required. By mechanical harvesting of trees in corridors, the number of crane movements per tree is decreased, resulting in lower harvest costs. In a pine stand in southern Sweden, this method of boom-corridor thinning was examined. This was done by measuring, perpendicular to the strip road, mean heights, breast height- and stump diameters, number of stems, tree species composition, stump heights and damages from thinning and later calculated in Excel. The relationship between harvested and standing tree diameters where 0,77, which can be compared to a heavy thinning from below. The thinning grade resulted in 53% with 61% trees harvested in boom-corridors. Damage percent resulted in 1.5% and the mean stump-height was 48 cm, none of these factors could be connected to their strip-road distance. Before thinning the number of stems was 2267 stems >3cm per hectare. For a better evaluation of the method, stands with higher number of stems would be required.

Place, publisher, year, edition, pages
2018. , p. 23
Keywords [en]
Boom-corridor thinning, Forest management, Thinning method.
Keywords [sv]
Krankorridorgallring, Skogsskötsel, Gallringsmetod
National Category
Forest Science
Identifiers
URN: urn:nbn:se:lnu:diva-76191OAI: oai:DiVA.org:lnu-76191DiVA, id: diva2:1221164
External cooperation
Skogforsk
Subject / course
Skogs- och träteknik
Educational program
Forest Production and Wood utilization Programme, 180 credits
Supervisors
Examiners
Available from: 2018-06-20 Created: 2018-06-19 Last updated: 2018-06-20Bibliographically approved

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AlbinLarssonEkström(394 kB)2 downloads
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Type fulltextMimetype application/pdf

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CiteExportLink to record
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