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.
2018
Forfattere
Ingeborg KlingenSammendrag
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Sammendrag
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Forfattere
Daniel Girma Mulat Janka Dibdiakova Mihaela Tanase Opedal Svein Jarle HornSammendrag
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Forfattere
Tomas Persson Mats Höglind Marcel Van Oijen Panu Korhonen Taru Palosuo Guillaume Jégo Perttu Virkajärvi Gilles Bélanger Anne-Maj GustavssonSammendrag
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Forfattere
Svein Solberg Johannes May Wiley Steven Bogren Johannes Breidenbach Torfinn Torp Belachew Gizachew ZelekeSammendrag
Monitoring changes in forest height, biomass and carbon stock is important for understanding the drivers of forest change, clarifying the geography and magnitude of the fluxes of the global carbon budget and for providing input data to REDD+. The objective of this study was to investigate the feasibility of covering these monitoring needs using InSAR DEM changes over time and associated estimates of forest biomass change and corresponding net CO2 emissions. A wall-to-wall map of net forest change for Uganda with its tropical forests was derived from two Digital Elevation Model (DEM) datasets, namely the SRTM acquired in 2000 and TanDEM-X acquired around 2012 based on Interferometric SAR (InSAR) and based on the height of the phase center. Errors in the form of bias, as well as parallel lines and belts having a certain height shift in the SRTM DEM were removed, and the penetration difference between X- and C-band SAR into the forest canopy was corrected. On average, we estimated X-band InSAR height to decrease by 7 cm during the period 2000–2012, corresponding to an estimated annual CO2 emission of 5 Mt for the entirety of Uganda. The uncertainty of this estimate given as a 95% confidence interval was 2.9–7.1 Mt. The presented method has a number of issues that require further research, including the particular SRTM biases and artifact errors; the penetration difference between the X- and C-band; the final height adjustment; and the validity of a linear conversion from InSAR height change to AGB change. However, the results corresponded well to other datasets on forest change and AGB stocks, concerning both their geographical variation and their aggregated values.
Sammendrag
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Sammendrag
Forskere, bønder og andre som er interessert i framtidens utmarksbeite inviteres nå til internasjonalt seminar på Vestvågøy i Lofoten.
Forfattere
Anna Maria Vettraino Alberto Santini Christo Nikolov Jean-Claude Grégoire Rumen Tomov Andrei Orlinski Tiit Maaten Halldors Sverrisson Bjørn Økland René EschenSammendrag
The sentinel plants concept responds to the need for new strategies to identify and study potential plant pests (including pathogens) and assess associated risks before their introduction to other continents. However, even if very promising, this tool is not yet implemented on a large scale, partially because it requires adequate planning, long-term funding, strong local links and reliable collaborators. In addition, a wider implementation of sentinel plantations and sentinel nurseries requires knowledge of regulations and procedures regarding the possibilities for their establishment in different countries. In order to achieve this objective, a questionnaire survey was conducted in 2016, to which more than 40 countries around the world responded. The results reveal that many countries have few regulations specifically concerning the import of propagation material, making import of this relatively low-risk material easier than the import of larger living plants that may have been more exposed to pests in the exporting country. The planting of alien woody plants in the environment is possible for scientific purposes in most countries as exemption from general phytosanitary import requirements, but the import and planting of alien plant species may be regulated by different government departments. We will present the outcomes of this study, which will be useful to facilitate the selection of locations for future sentinel plants and may provide guidance on the rules for import of plant propagation material for the establishment of sentinel plants and sentinel nurseries in different countries.
Forfattere
Stefanos Xenarios Henrique Queiroga Ana I. Lillebø Ana AleixoSammendrag
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