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
The precise spatially explicit data on land cover and land use changes is one of the essential variables for enhancing the quantification of greenhouse gas emissions and removals, which is relevant for meeting the goal of the European economy and society to become climate-neutral by 2050. The accuracy of the machine learning models trained on remote-sensed data suffers from a lack of reliable training datasets and they are often site-specific. Therefore, in this study, we proposed a method that integrates the bi-temporal analysis of the combination of spectral indices that detects the potential changes, which then serve as reference data for the Random Forest classifier. In addition, we examined the transferability of the pre-trained model over time, which is an important aspect from the operational point of view and may significantly reduce the time required for the preparation of reliable and accurate training data. Two types of vegetation losses were identified: woody coverage converted to non-woody vegetation, and vegetated areas converted to sealed surfaces or bare soil. The vegetation losses were detected annually over the period 2018–2021 with an overall accuracy (OA) above 0.97 and a Kappa coefficient of 0.95 for all time intervals in the study regions in Poland and Norway. Additionally, the pre-trained model’s temporal transferability revealed an improvement of the OA by 5 percentage points and the macroF1-Score value by 12 percentage points compared to the original model.
Forfattere
Jorunn Børve Marcel Wenneker Juliana Perminow May Bente Brurberg Khanh Pham Arne StensvandSammendrag
Bacterial canker caused by Pseudomonas syringae is an important disease on stone fruit trees. The development of infections after artificial inoculation of sweet cherry and plum trees in the nursery phase was examined. Furthermore, sweet cherry trees were observed in a nursery and for up to four years after planting in commercial sweet cherry orchards. If inoculated at the time of grafting, this caused near 100% death of the scions. Following inoculation of defeathering wounds, a mean of 52 and 61% of inoculation sites developed bacterial canker on sweet cherry and plum, respectively. Of non-inoculated nursery trees observed as healthy in the autumn, between 20 and 80% had developed visible bacterial cankers after a period of cold storage. In the planting year, a mean of 21% of the trees developed bacterial canker in seven commercial orchards included in the investigation, and by 2–4 years after planting 40% of the trees had symptoms of the disease. All sweet cherry cultivars and rootstocks developed bacterial canker in the commercial orchards. Cultivar Giorgia had the most severe symptoms. Up to 60% replacement of trees within two years after planting was experienced in the orchards.
Sammendrag
I denne artikkelen presenteres resultater fra forsøk gjennomført i 2023 og 2024 med dyrking av løk fra planteløk. Det ble testet totalt 13 ulike sorter av ulike typer løk (gul, hvit, rosa, søt og salat). Målet med forsøkene var å finne ut om det er potensiale for kommersiell dyrking av planteløk under norske klimaforhold. I tillegg ble det sett på lagringskvalitet og ulike innholdsstoffer i løken.
Forfattere
Junbin Zhao Simon Weldon Alexandra Barthelmes Erin Swails Kristell Hergoualc’h Ülo Mander Chunjing Qiu John Connolly Whendee L. Silver David I. CampbellSammendrag
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Forfattere
Pia Heltoft ThomsenSammendrag
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