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.
2008
Forfattere
Hallvard Jensen Kimmo K. Kahilainen Per-Arne Amundsen Karl øystein Gjelland Anti Tuomaala Tommy Malinen Thomas BøhnSammendrag
Det er ikke registrert sammendrag
Forfattere
Per Otto Flæte Kjell VadlaSammendrag
Concern about environmental impacts of chemical wood preservatives has resulted in increased interest for natural wood durability. The natural durability of sapwood of most species is generally low, while heartwood can be more resistant to biodeterioration. For the sawmill industry various lumber products require certain diameters and lengths of the logs in addition to requirements for wood properties. When utilising the heartwood, it is therefore important to acquire information already in the forest about which trees that can be suitable for logs with a predefined heartwood diameter and length. The main objectives of this work was to study the variation in heartwood diameter along the stem of Scots pines (Pinus sylvestris L.), and to develop a model for predicting heartwood diameter profiles based on variables that can easily be measured in the forest.....
Forfattere
Jogeir N. Stokland Vegar Bakkestuen Trine Bekkby Eli Rinde Olav Skarpaas Anne Sverdrup-Thygeson Nigel Gilles Yoccoz Rune HalvorsenSammendrag
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Forfattere
Tor J. JohansenSammendrag
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Sammendrag
From 2002 to 2006, the annual dropout rate of certified organic farmers averaged 7.3 %. A project was started in 2007 to explore farmer"s reasons for opting out of certified organic production. Important factors were public regulations including standards for organic farming, agronomy, economy, and farm exit. While many organic farmers with relatively small holdings have opted out, farmers with more land and larger herds tend to convert to organic agriculture. The trend towards larger-scale farms in organic than in conventional agriculture, encouraged by the design of the organic farming payments, challenges the organic principles of diversity and fairness. Means should be considered to ensure that small organic enterprises are also economically viable.
Sammendrag
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Sammendrag
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Forfattere
Hallvard JensenSammendrag
Predation has a fundamental role in aquatic ecosystems, but the relative importance of factors governing prey selection by predators remains controversial. In this study, we contrast five lakes of a subarctic watercourse to explore how prey community characteristics affect prey selection and growth of the top predator brown trout. The brown trout was a morph/species- and size-specific pelagic predator, selecting the small-sized, pelagic whitefish morph or vendace over the benthic whitefish morphs. In all lakes, the average prey size increased with predator size, but small-sized prey were also included in the diet of large predators. The selection of small-sized, pelagic prey fish appeared to be a favourable foraging strategy for the brown trout, yielding higher growth rates and an earlier ontogenetic shift to piscivory.
Forfattere
Marcel Van Oijen Stig Morten Thorsen Ad Schapendonk Mats HøglindSammendrag
Conclusion: The process based model for timothy seems to capture the essential dynamics of the grassland model in both summer and winter.
Forfattere
jihong liu clarkeSammendrag
Det er ikke registrert sammendrag