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.
2007
Forfattere
Ketil Kohmann Øystein JohnsenSammendrag
The object of this study was to obtain Norway spruce seedlings with buds set, ready for summer planting from the 1st of July. With an early long night treatment we prevented flushing of the newly formed terminal buds, ceased height growth, but slightly reduced hardiness in buds and needles. Nevertheless, a sufficient hardiness level in the autumn was acquired at a Norwegian nursery at 59°46’ N, with plants of the local provenance given a long night treatment (14 hours) for 13 days from the 25th of June. The similar treatment at a nursery at 64°30’N did not give the same result; all treatments led to a second flush with resumed growth of the local provenance. A trial with seed lots from several provenances was therefore performed at this nursery, and a significant correlation between the critical night length of the seed lot, and their ability to produce non-flushing buds, was found; the longer the critical night length of the seed lot, the less non-flushing buds. Responses at the northern nursery are probably due to the non existing dark period after termination of the treatment, and a too short treatment period to attain bud dormancy. An early and successful long-night treatment will, in addition, produce shorter seedlings with a larger root collar diameter.
Forfattere
Erlend Nybakk Terje Birkeland Knut FinstadSammendrag
This study is based on a certain case with the largest Norwegian Forest Association (Viken Skog BA) as timber seller and Haselstad Bruk AS buyer of saw logs. The objective of the study is to adopt a more effective, accurate and market-oriented timber production system in the south-east of Norway using bucking-to-demand. A bucking simulator called OptApt is further developed with the addition of a function for near-optimal bucking-to-demand, to evaluate this bucking regime in relation to the traditional bucking-to-value approach used under Norwegian conditions, which means large variations in forests when it comes to dimensions and quality between, but also within, regions and stands. ....
Forfattere
Erlend Nybakk Eric N. HansenSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Elena Iordanova Vanguelova Yasuhiro Hirano Toril Drabløs Eldhuset Lidia Sas-Paszt Mark R. Bakker Ülle Püttsepp Ivano Brunner Krista Lõhmus Douglas Lawrence GodboldSammendrag
Det er ikke registrert sammendrag
Forfattere
Torstein KvammeSammendrag
Det er ikke registrert sammendrag
Sammendrag
The effectiveness against soft rotting micro fungi and other soil inhabiting micro-organisms was tested according to ENV 807 using different treated Scots pine sapwood and beech wood samples. The treatments differed in basic material, solvent, depolymerization agent, viscosity and post treatment. The chitosan treated Scots pine samples showed improved performance against soft rot, whereas a large amount of untreated pines sapwood samples failed during the test. The different chitosan treatments showed only slight differences in performance during the test.Further results of ongoing field tests should give more information about the life performance of the treated samples.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Studies of defense mechanisms in Norway spruce Picea abies against the spruce bark beetle Ips typographus show that inducible defenses are triggered by unsuccessful beetle attacks. Moreover, spruce trees can be vaccinated against bark beetle attacks through stem bark inoculation with Ceratocystis polonica, an aggressive fungal associate of Ips typographus. Artificial inoculation with certain other fungi has a similar effect, making treated trees a tougher mach for attacking beetles. A similar enhancement of resistance can be achieved by stem surface treatment with methyl jasmonate. Enhanced resistance is associated with the formation of traumatic resin ducts, and mobilization of phenolic substances in living parenchyma cells. The phenolics appear to mix with the traumatic resin. Similar mechanisms are operating in other conifers. We hypothesize that unsuccessful beetle attacks produce a vaccination effect in the trees, enhancing their resistance to later attack. Adding the effect of induced resistance as a model factor shows an immediate effect on the population dynamics of Ips typographus.
Forfattere
Inge Stupak Antti Asikainen M. Jonsell Erik Karltun Anders Lunnan D. Mizaraite K. Pasanen H. Pärn Karsten Raulund-Rasmussen Dominik Röser M. Schröder I. Varnagiryte L. Vilkriste Ingeborg Callesen Nicholas Clarke Talis Gaitnieks Morten Ingerslev M. Mandre R. Ozolincius Anna Saarsalmi Kestutis Armolaitis Heljä-Sisko Helmisaari A. Indriksons L. Kairiukstis K. Katzensteiner Mikko Kukkola K. Ots Hans Peter Ravn Pekka TamminenSammendrag
The substitution of biomass for fossils fuels in energy consumption is a measure to mitigate global warming, as well as having other advantages. Political action plans for increased use exist at both European and national levels. This paper briefly reviews the contents of recommendations, guidelines and other synthesis publications on sustainable use of forest biomass for energy. Topics are listed and an overview of advantages, disadvantages and trade-offs between them is given, from the viewpoint of society in general and the forestry and energy sectors in particular. For the Nordic and Baltic countries, the paper also identifies the extent to which wood for energy is included in forest legislation and forest certification standards under the “Programme for the Endorsement of Forest Certification” (PEFC) and the “Forest Stewardship Council” (FSC) schemes. Energy and forest policies at EU and national levels, and European PEFC forest standards are analysed. With respect to energy policies, the utilisation of wood for energy is generally supported in forest policies, but forest legislation is seldom used as a direct tool to encourage the utilisation of wood for energy. Regulations sometimes restrict use for environmental reasons. Forest certification standards include indicators directly related to the utilisation of wood for energy under several criteria, with most occurrences found under environmental criteria. Roles and problems in relation to policy, legislation, certification standards, recommendations and guidelines, and science are discussed.