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.
2004
Forfattere
Per Otto Flæte Erlend Ystrøm HaartveitSammendrag
In Scandinavia Scots pine (Pinus sylvestris L.) is an important commercial tree species. Its heartwood has traditionally been used in constructions exposed to risk of decay. In a laboratory experiment Scots pine wood specimens sampled from inner heartwood, outer heartwood and sapwood were exposed to the brown rot fungus Poria placenta.In general outer heartwood was more resistant than inner heartwood, but there were variations even within the same wood zone. NIR spectra obtained on solid wood prior to decay testing were used in multivariate calibrations to predict decay resistance of heartwood.Results from segmented cross validated partial least squares (PLS1) regression modelling showed that resistance to decay in Scots pine heartwood could be predicted with satisfying precision using NIR spectroscopy. As NIR spectra were collected on solid wood, development of the method for industrial use is potentially possible.
Forfattere
Jørn Kristian Lileng Erlend Ystrøm HaartveitSammendrag
Forest roads ensure access to standing timber and their standards may restrict the opportunity set for efficient logistical solutions. Traditionally, the objective of road investments has been maximisation of returns for the landowner.Investments in forest roads in Norway are subsidised by the Norwegian government. These subsidies should preferably be allocated to projects creating the best premises for efficient log supply. The total cost approach evaluates costs using a holistic perspective. In this paper we use this approach to evaluate the profitability of investments in forest roads so that the total costs for log supply to the industry are minimised.The distribution of standing timber in the catchment area of the forest road is also taken into account. The results show that the sum of costs for road construction, harvesting and forwarding account for more than 99% of the total costs, compared to less than 1% for the sum of log hauling costs. Differentiation of forest road standards is more appropriate in situations where the volume of standing timber decreases in remote areas of the forest road network.
Sammendrag
A method for determination of the climate gases CH4, CO2 and N2O in air samples and soil atmosphere was developed using GC-MS. The method uses straightforward gas chromatography (separation of the gases) with a mass spectrometric detector in single ion mode (specific determination).The gases were determined with high sensitivity and high sample throughput (18 samples h1). The LOD (3) for the gases were 0.10 L L1 for CH4, 20 L L1 for CO2 and 0.02 L L1 for N2O. The linear range (R2 = 0.999) was up to 500 L L1 for CH4, 4000 L L1 for CO2 and 80 L L1 for N2O. The samples were collected in 10 mL vials and a 5 L aliquot was injected on column.The method was tested against certified gas references, the analytical data gave an accuracy within 5% and a precision of 3%. The presence of 10% by volume of C2H2 (often used experimentally to prevent N2 formation from N2O) did not interfere with detection for the targeted trace gases.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Kjersti Holt HanssenSammendrag
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Forfattere
Kaj Bo Veiersted Tove M. ØstensvikSammendrag
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Forfattere
Åsmund AsdalSammendrag
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Forfattere
Knut Langeland Åsmund AsdalSammendrag
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Forfattere
Terje BirkelandSammendrag
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Forfattere
Ingvald RøsbergSammendrag
Det er ikke registrert sammendrag