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
Forfattere
Gry AlfredsenSammendrag
Det er ikke registrert sammendrag
Forfattere
Gry Alfredsen Geir Wæhler Gustavsen Lone Ross Jonas Niklewski Philip Bester van Niekerk Christian BrischkeSammendrag
To optimise the use of renewable materials in construction, it is essential to understand the factors influencing decisions throughout their design and service life. Life Cycle Costing (LCC) supports sustainable development by aiming to minimise long-term costs through informed planning of service life, maintenance, and replacement. Central to this is the engineering concept of limit states - Ultimate Limit States (ULS) for structural safety and Serviceability Limit States (SLS) for functionality. However, in non-loadbearing applications such as cladding, maintenance is often driven by aesthetic deterioration rather than structural concerns. These aesthetic limit states are subjective and influenced by user preferences, personality traits, and cultural background. In practice, undesired aesthetic changes are among the main reasons for cladding replacement in Europe, alongside fungal decay and modernisation. Premature replacement due to insufficient communication about weathering effects and maintenance needs remains under-addressed. By accounting for variation in user preferences, material selection can be tailored to support a longer service life. This study presents multi-country variation in climate-related perceptions of wood and user preferences for wooden cladding.
Forfattere
Gry Alfredsen Michael Altgen Mari S. Austigard Johan Mattsson Maria Nunez Lone Ross Sverre Aarseth Tunstad Andreas Treu Igor A. Yakovlev Nanna Bjerregaard PedersenSammendrag
A total of 212 iconic wooden cable car pylons were constructed for mining operations in Svalbard, significantly contributing to Longyearbyen's historical identity as a mining town. Fieldwork in Svalbard involved collecting wood samples from 22 of these pylons, targeting wood exposed both aboveground and ground proximity. While the timber used in the constructions was assumed to be untreated Norway spruce (Picea abies), light microscopy revealed that 25% of the timber members were Scots pine (Pinus sylvestris). Wooden beams exposed aboveground showed initial decay over the first 80-90 years, whereas severe fungal decay was observed after about 50 years in wooden poles inserted in the ground. Metabarcoding identified Ascomycetes and Basidiomycetes to be predominating in the wood samples and unveiled new fungal species for Svalbard, including four brown rot, five white rot, and sixteen soft rot species. Macroscopic and microscopic examinations confirmed more advanced decay in ground proximity samples, dominated by brown and soft rot fungi.
Forfattere
Andreas Hagemann Marianne Nymark Rasa Slizyte Søren Krogh Jensen Gry Alfredsen Revilija Mozuraityte Jakob Irgens Blakstad Nada Ahmed Dhaoui Mie Bue Gjeten Franciska Senta Steinhoff Kyla Zatti Egil Petter StræteSammendrag
Poster Presentation
Sammendrag
Understanding the service life of wood products used outdoors is essential for end-users to set realistic expectations regarding material performance. Furthermore, reliable service life data is critical for assessing building costs, environmental impact, and carbon storage potential. The report compiles existing knowledge on the service life of wood in outdoor constructions in Norway. The relevant applications included are wood used in ground contact, decking, and external cladding, and the data are derived from field trials conducted in Norway. The primary aim is to update the service life tables from a report published in 2014. Additionally, the report provides a brief introduction to the topic of wood protection. Many factors influence the service life of wood products, with temperature and moisture being the two most significant. The service life of wood in constructions primarily depends on the application, the natural durability of the material, any wood preservatives used, the presence of wood-degrading organisms, architecture, and craftsmanship. Poorly designed construction details can act as moisture traps, leading to early fungal damage. Therefore, it is important to address future climate challenges with well-informed solutions for optimal wood use. Secondarily, service life depends on thorough and repeated maintenance.
Sammendrag
Wood is a renewable resource, but not an unlimited one. Circular use of wood can mitigate greenhouse gas emissions and spare virgin resources. To plan for the circular use of building materials, it is important to study the availability of building materials in the built environment and the materials liberated during renovation. There exist multiple studies on so-called material intensities in buildings (Amini et al., 2024; Arceo et al., 2021; Fishman et al., 2024; Nasiri et al., 2023), but few evaluate the material intensities before and after renovation. In this study, we try to fill the knowledge gap by preforming a case study of a log house from the 19th century, upgraded to a student residence satisfying the building requirements for new Norwegian buildings.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Marte Ragnhild Owren Ingvild Byskov Britta Marian Hoem Julien Jabot Hans H. Kolhus Elise Grieg Jakob Sandven Kathrine Loe Bjønness Trude Melby Bothner Mona Irene Andersen Engedal Eirik Knutsen Lene Skyrudsmoen Berit Storbråten Kristina Vikesund Evan Hart Ana Aza Gry Alfredsen Johannes Breidenbach Lise Dalsgaard Rune Eriksen Katharina Hobrak Christian Wilhelm Mohr Christophe Moni Gunnhild SøgaardRedaktører
Ingeborg RønningSammendrag
Norwegian greenhouse gas emission 1990-2023, report to the UN
Sammendrag
Reusing and recycling post-consumer wood can help mitigate GHG emissions and reduce the risks of biodiversity loss by saving primary resources. A robust understanding of the post-consumer wood composition and its cascading potential is critical to enable this. However, there is currently limited research on the topic. This study contributes to filling the knowledge gap by sorting 54 tons of post-consumer wood at two industrial recycling stations and one household recycling station in Norway and further developing a classification system with quantified cascading potentials for post-consumer wood. The results showed that 49–64 percent of the wood at the industrial recycling stations and 32 percent at the household recycling station was load-bearing and untreated solid wood. We argue that these categories have a good potential for reuse and recycling. The high percentages indicate an opportunity for increasing the recycling and reuse of post-consumer wood. However, we also discovered some misplaced preservative-treated materials and a percentage of fiberboards that exceed particleboard manufacturer limits, meaning that sorting before recycling is required. Furthermore, we investigated how the wood composition was influenced by the type of customer delivering wood to the recycling stations and found that households generally deliver lower quality post-consumer wood than industrial customers.
Forfattere
Gry Alfredsen Michael Altgen Mari S. Austigard Johan Mattsson Maria Nunez Lone Ross Sverre Aarseth Tunstad Andreas Treu Igor A. Yakovlev Nanna Bjerregaard PedersenSammendrag
This study uses a novel combination of DNA metabarcoding, light microscopy, decay rating, moisture dynamics, and chemical analysis to investigate wood decay in cultural heritage cable car pylons in Svalbard. Uniform design but varying ages allowed analysis of time-dependent decay. Light microscopy revealed the use of both Picea abies and Pinus sylvestris . Decay progressed more rapidly near ground contact, influencing density, lignin, and holocellulose content, with lignin increasing over time. DNA metabarcoding and microscopy revealed dominant brown and soft rot fungi, with greater fungal diversity near ground level. Several new fungal species were identified for Svalbard and the polar regions. In the context of climate change, this highlights the global importance of monitoring fungal decay in wooden structures. The study emphasises the need for updated species lists and continuous monitoring, as new fungi may affect conservation strategies. The interdisciplinary method offers deeper insight into microbial interactions than single-method approaches.