Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2025
Sammendrag
Det er ikke registrert sammendrag
2024
Sammendrag
Sprengkulda fester grepet over store deler av landet. Da er det bare å fyre i ovnen. Bjørkeved er populært, men hvorfor ikke velge gran?
Sammendrag
Fyringsveden tørkes om våren. Men hvor lang tid tar det? NIBIOs vedeksperter har testet våre sju vanligste treslag. Resultatet viser at veden stort sett er tørr i begynnelsen av juni, men ett treslag skiller seg ut.
Sammendrag
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Forfattere
Petri Widsten Satu Salo Marc Borrega Anna Kalliola Lauri Tuominen Melissa Agustin Jenni Rahikainen Elisa Spönla Andreas TreuSammendrag
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Forfattere
Martin Næsset HillestadSammendrag
Large volumes of Norway spruce (Picea abies (L.) Karst.) in Northern Norway are approaching maturity. Previous studies conducted on Norway spruce from Northern Norway, indicates lower density and mechanical properties than for Norway spruce grown in the rest of the country. This might be critical for use of Norway spruce from Northern Norway as structural timber. The purpose of this study was to assess lumber quality, density, modulus of elasticity and modulus of rupture on a sample of Norway spruce from Northern Norway, and to evaluate whether visual strength grading results in sufficient properties. Density and mechanical properties were compared to values from Southern Norway, and previous studies from Northern Norway. A sample consisting of 109 boards sawn from 12 trees of Norway spruce, collected from 4 trial stands in Northern Norway, was visually strength graded according to NS-INSTA 142, before density, modulus of elasticity and modulus of rupture was tested according to NS-EN 408. Characteristic values calculated according to NS-EN 384 and verified according to NS-EN 14358, were compared to the strength classes of NS-EN 338. Variation in density and mechanical properties were modelled with linear mixed models, where the random variance was separated into tree-variance and residual variance. Variables on board and log level were treated as fixed effects, and used as covariates in the models. Relative height, calculated as each log’s vertical position in relation to total tree height, was the most important variable for density. Density increased with increasing relative height. Density was important for modulus of elasticity and modulus of rupture, and both increased with increasing density. Variation in density between stands seems to be partly attributed to variation in latitude and altitude. Knots affected both modulus of elasticity and modulus of rupture, and differences in average knot diameter seems to coincide with differences in mechanical properties between stands. Differences in average knot diameter and mechanical properties between stands coincides with differences in silviculture. Mean values for density, modulus of elasticity and modulus of rupture were lower than what is observed in the Southern and middle parts of Norway, but higher than previous studies from Northern Norway. The visual grading resulted in most boards sorted as grade T2, followed by T1, T3 and T0. The characteristic values met requirements for all sorting grades apart from density in T3 for C30, and modulus of rupture in T1 for C18. Low numbers resulted in large uncertainties concerning characteristic values. Despite this, sorting grades T2 and T2+T3 met all requirements for C24. The results give positive indications for density, modulus of elasticity and modulus of rupture in Norway spruce from Northern Norway, and the properties as structural timber. The study is based on a limited sample of boards, collected from a limited number of trial stands, and this results in large uncertainties. Further studies are therefore needed, and should gain values more representative for the forest in Northern Norway.
Sammendrag
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Forfattere
Trygve S. Aamlid Tatsiana Espevig Karin Juul Hesselsøe Wendy Marie Waalen Pia Heltoft Thomsen Anne Friederike Borchert Marit Almvik Michael Bekken Monica Fongen Sigridur Dalmannsdottir Carl Johan Lönnberg Håkan Blusi Michelle DaCosta Eric WatkinsSammendrag
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Forfattere
Muhammad Awais Michael Altgen Lone Ross Thomas Kringlebotn Thiis Arnkell Petersen Ingunn BurudSammendrag
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Forfattere
Kristina Bringedal GeddeSammendrag
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