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.
2026
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Johannes BreidenbachSammendrag
Invited speaker at Symposium Future research in forest monitoring and remote sensing, organized by University Göttingen, Germany
Forfattere
Inger Sundheim FløistadSammendrag
Det er ikke registrert sammendrag
Sammendrag
Landbruks- og matdepartementet har gitt Norconsult, i samarbeid med NIBIO og Sogn Naturforvaltning, i oppdrag å utrede konsekvenser av etablering av tilleggsareal for Fovsen Njaarke sijte i området Håmmålsfjellet-Sålekinna. NIBIO har utredet konsekvensene for jordbruk, skogbruk, sykdom/smitte og dyrevelferd ifm. transport av rein. Konsekvensgraden etter utvalgte skadereduserende tiltak er vurdert til å være mellom middels negativ til stor negativ konsekvens for jordbruk, noe negativ konsekvens for skogbruk, noe negativ konsekvens for sykdom/smitte bortsett fra for hjernemark som er vurdert til stor negativ konsekvens, og noe negativ konsekvens for dyrevelferd ifm. transport av rein.
Sammendrag
Spatially explicit information on forest resources and structure is essential for sustainable forest management and evidence-based policy-making. In the Nordic region, large-scale forest mapping often relies on integrating National Forest Inventory (NFI) field plots with airborne laser scanning (ALS) data. However, infrequent nationwide ALS campaign coverage limits their use for continuous monitoring. Satellite imagery, with its high temporal and spatial resolution, provides a promising alternative. We evaluate UNet-based deep learning models trained on wall-to-wall ALS-derived forest resource maps for predicting volume and Lorey’s height in Norway using optical (Sentinel-2) and SAR (Sentinel-1, PALSAR-2) data. The UNet models, trained on both Finnish and Norwegian ALS maps, are benchmarked against extreme gradient boosting (XGB) models. Transfer learning is further explored by finetuning models using Norwegian NFI plots. Model accuracies are assessed using 541 reserved test NFI plots and 44 independent forest stands, representing high‑volume mature boreal forests (>200 m3 ha−1). The UNet model trained on Norwegian ALS‑based data achieved R2 values of 0.59 for both volume and Lorey’s height when evaluated on NFI plots, and 0.70 and 0.59 for forest stands, respectively, outperforming the XGB models. Finetuning improved model transferability, yielding gains of up to 0.13 in R2 for volume and 0.46 for Lorey’s height when adapting the Finnish model to Norwegian conditions. Utilizing SAR data alongside optical data enhanced model accuracy. Overall, our findings demonstrate the potential of UNet models trained on wall-to-wall ALS maps for forest resource mapping across Nordic countries.
Sammendrag
Non-destructive and rapid analysis of adhesive penetration in engineered wood products ensures bond integrity, enabling the development of novel adhesives and quality manufacturing. The present study evaluated the X-ray densitometry method for studying the adhesive penetration in birch plywood. In this approach, it was quantified as a function of distance by measuring the X-ray density profile section where the adhesive bond-line density was above the baseline wood density. Accordingly, untreated and esterified birch veneers were pressed into plywood using both liquid and solid-type phenolic adhesives, resulting in four types of five-layered plywood of 7-8 mm in thickness. Optimization of X-ray beam attenuation through the plywood was done by preliminary trials and identified the specimen dimensions as 50 mm in height and 25 mm in width using a scanning speed of 0.5 mm min $$^{-1}$$ . The X-ray densitometry measured densities of cured phenolic adhesive to be 1150 ± 50 kg m $$^{-3}$$ and esterification-modified birch plywood to be 750 ± 25 kg m $$^{-3}$$ . These density values are consistent with gravimetric density measurements. Density profile observations indicate that both liquid and solid forms of phenolic adhesives exhibited similar levels of adhesive penetration in plywood. X-ray densitometry analysis determined a total interphase thickness ranging from 0.50 to 0.75 mm, encompassing the central adhesive bond-line and the effective adhesive penetration into both adjacent veneers. These values are comparable with those measurements obtained from microscopy imaging analysis. Therefore, X-ray densitometry could be a swift method for quantifying adhesive penetration, although further studies are needed to validate its accuracy and reliability.
Forfattere
Ishita Ahuja Arne Steffenrem Irena Fundova Helmer Belbo Torstein Myhre Inger Sundheim FløistadSammendrag
When regenerating clearcut areas in Norway and several other countries, tree seedlings are planted adjacent to stumps of harvested trees to reduce snow load and provide shading, despite limited scientific evidence supporting this practice. This study investigated the role of tree-stumps as planting microsites in the establishment of Norway spruce (Picea abies (L.) Karst.) seedlings. We assessed the growth and survival of seedlings from two provenances: Undesløs seed orchard (60.7°, 140 m), consisting of tested parents from the lowland around 63–65°N, and seed collected from forests in the M4 provenance (64–65°N, 350–449 m), at two microsite types in Trøndelag County, Norway: beside stumps (Microsites-B) and at a distance from stumps (Microsites-D). Undesløs seedlings exhibited 100% survival at Microsites-B, whereas M4 seedlings showed higher survival at Microsites-D. Provenance had a significant effect on seedling height and diameter, while microsite type had no significant effect on these parameters. In 2022, significant differences in height and diameter were observed between provenances at Microsites-B. Phenotypic variations, including chlorotic, green, and brown needles, occurred in seedlings of both provenances across both microsite types. Overall, this single-site experiment provided no evidence that planting beside stumps improves growth/survival compared with planting at a distance away.
Sammendrag
Biochar, a carbon‐rich product of pyrolysis, is increasingly considered for soil amendment and climate change mitigation due to its potential to enhance soil properties and sequester carbon. However, its effects on tree growth in forest ecosystems remain uncertain. This study investigated the impact of biochar and nitrogen‐enriched biochar on the growth of two middle‐aged (approximately 60‐year‐old) Scots pine stands in southeastern Norway. Both stands were characterized by medium site indices and podzolic soils. In replicated field experiments, we applied four treatments consisting of an unfertilized control, and addition of biochar (2.5 t ha −1 ), nitrogen fertilizer (150 kg N ha −1 ), or biochar loaded with nitrogen (2.5 t biochar +150 kg N ha −1 ). The biochar was produced by pyrolysis of Norway spruce wood chips at 600°C. After 5 years, only treatments containing added nitrogen (either as mineral fertilizer or as nutrient‐enriched biochar) significantly increased basal area and volume growth compared to control. No significant difference in timing or magnitude of effects was observed between the nitrogen and biochar + nitrogen treatments, except better annual growth in the combined treatment the third year after fertilization, indicating rapid nitrogen release and uptake regardless of carrier. Pure biochar did not stimulate tree growth. While biochar did not negatively affect growth, its direct role as a growth stimulant was not supported under these conditions, at least in the short‐term with the dose of 2.5 t ha −1 . Further research is needed across different forest ages, site types, and application rates to fully understand biochar's potential in forestry.
Sammendrag
I prosjektet ForGran (2024-2028) undersøker vi avgang, vitalitet og tidlig utvikling hos plantet gran i ulike deler av Norge, med mål om å styrke kunnskapsgrunnlaget for vellykket foryngelse etter hogst. I 2025 ble 70 bestand og 684 sirkelprøveflater kartlagt, og 4474 kulturplanter ble registrert etter første vekstsesong. Resultatene viser at 79 % av bestandene hadde flere planter enn minimumskravet i forskrift om bærekraftig skogbruk. Etter første vekstsesong var 66 % av plantene vitale, mens 12 % var døde eller hadde kraftig nedsatt vitalitet. Gransnutebille var den vanligste registrerte skadeårsaken blant skadde planter, og barkskader var den vanligste skadetypen. De fleste plantefeltene var ikke markberedt, og plantene var satt rett i vegetasjonen eller ved stubbe. Analysene viste at enkelte planteplasser, særlig markberedningsgrop med høy plassering, omvendt torv med mineraljord, plassering ved stein eller død ved og plassering ved stubbe, hadde positiv sammenheng med vitalitet. Resultatene peker på at planteplass, markberedning og snutebillebeskyttelse kan ha stor betydning for plantenes tidlige etablering. Registreringene de neste årene vil gi et større samlet datamateriale og et bedre grunnlag for å gi anbefalinger til skogbruket. Som en del av prosjektet vil også et utvalg av bestandene registreres på nytt etter tre vekstsesonger. Dette vil gi sikrere svar på årsakssammenhenger over tid.
Sammendrag
There is an increasing interest in using forests as a natural solution for enhancing terrestrial carbon dioxide removal, as part of climate smart forestry strategy to have a significant role in climate mitigation efforts. Harvest deferral is seen as one carbon farming practice to increase carbon sequestration in forests. The aim of this study was to evaluate the role of harvest deferral on carbon forest sink potential of Norwegian forests in the short, medium and long-term. Here, we carried out scenario analysis for the whole Norway during the 21st century to assess the effect on carbon sequestration of delaying harvest in a certain number of forests. The scenarios represented different levels of harvest deferral through Norwegian forests. Delaying harvest would increase CO2 removals in the medium (2050) and long-term (2100), resulting in an additional uptake of approximately 6 and 34 Tg CO2, respectively, when extending rotation for 20 years in those plots with high growth increment in the last 5 years. Scenarios where harvest was delayed for a longer period showed slightly higher CO2 removals by the end of the century. While harvest deferral scenarios showed positive effects in terms of climate change mitigation potential, there are several other aspects that need to be considered, such as trade-offs and synergies with other sustainability goals, leakage, market behaviour and willingness of forest owners to get involved in these carbon farming practices.