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.
2012
Forfattere
Aksel GranhusSammendrag
Fra en fryktet undergang for snart 100 år siden er mengden skog i Norge i dag større enn noen sinne.
Forfattere
Lone Ross Gobakken Olav Albert HøibøSammendrag
The aesthetic service life of outdoor exposed wooden surfaces are often decided by growth of moulds and blue stain fungi, but also other visual changes caused by weathering such as colour changes, abrasion or wear, blistering, flaking, and even cracks in the wood or coating will contribute. When developing models that describe changes in the wood material and aim to predict the service life, it is essential to understand the impact of different climatic factors, the effect of variation in the wooden product itself and in the quality of craftsmanship and building design. The objective of this presentation is to gather knowledge about which factors influence surface mould growth on wood substrates in an outdoor environment. The analysis and the model development are based on data from evaluation of mould growth coverage on outdoors exposed wood panels consisting of different combinations of wood substrates and surface finishes from a number of field studies performed over the last years [1, 2, 3, 4, 5, 6 and 7].
Forfattere
Jan-Ole SkageSammendrag
Ved parkeringen til Hordnesmarka og innkjøringen til Stavollen idrettspark og Bjarghallen vokser det et lite, men flott bestand med japansk lerk. Lerken ble plantet i 1939 av ansatte ved Stend videregående skole. Feltet er blitt tynnet hele 8 ganger, mens veksten er blitt undersøkt 14 ganger av Skog og landskap på Fana i perioden 1951 til 2007. Det største treet var da ved 72 års alder hele 33,4 m høyt med en diameter på 46,4 cm. Tømmeret er både sterkt og varig, virket har derfor mange og gode bruksområder. Konglene er dekorative og kan brukes til pynting, blant annet som borddekor og i buketter.
Forfattere
Peder GjerdrumSammendrag
Sawmillers want to have predictable and homogeneous timber outcome from their industry. This paper analyses and discusses how well timber quality of boards from the same log, and in particular pairs of sister boards, correspond to each other, i.e. the limit for quality homogeneity.Observations from three different sawn timber outcome experiments were analysed. Varying quality traits were observed: appearance and machine strength grading, knot size and number, and board value.The results showed that 80% and 53% respectively, for two different samples, of the boards had different quality grade from their sister boards, and less homogeneity when more boards are sawn from the same log. The correlation between observations made in sister boards were modestly 0.42 for biggest green knot diameter, and almost absent for dry knots and other traits. Board value and machine strength are better correlated, 0.76 and 0.69, respectively.Relative pairwise difference for these parameters was found to follow the exponential distribution with mean 0.169 and 0.068, respectively. The results clearly indicate that there is no easy way achieving a consistent and pre-requested quality, at the same time avoiding an inherent portion of diverted quality boards.
Forfattere
Lars Sandved DalenSammendrag
Store deler av arealet i Husfjorden og Straumdalen er svært godt egnet til beite for sau.
Forfattere
Helmer BelboSammendrag
Avvirkningskostnaden per kubikkmeter har alltid vært, og er fortsatt, sterkt knyttet til størrelsen på treet. Tynningsoperasjoner lider generelt under denne sammenhengen; trærne er relativt små, uten at dette øker prestasjonen i antall trær per time eller senker timekostnadene på driftsapparatet nevneverdig. Energivirketynning med flertrehåndtering er en relativt ny hogstform i nordisk skogbruk som gir muligheter for å effektivisere tynningshogsten.
Forfattere
Hilde Olsen Åge A. NyborgSammendrag
God matjord er en knapp ressurs. For å verne om den må vi vite hvor den ligger. Nye kart fra Skog og landskap viser hvor vi finner de beste jordbruksarelene.
Forfattere
Igor A. Yakovlev YeonKyeong Lee Adam Vivian-Smith Jorunn Elisabeth Olsen Carl Gunnar FossdalSammendrag
In Norway spruce there is an enigmatic epigenetic memory of the temperature conditions during embryogenesis affecting vital phenological traits (Yakovlev et al. 2012). Adaptive phenological traits such as bud burst and bud set, observed as clinal variation in nature, are the ones affected.The epigenetic memory is establishment exclusively during embryogenesis in response to environmental impact. The epitype fixated by the time the embryo is fully developed without any change in the primary DNA sequence and is mitotically propogated. The epigenetic mechanism influence the phenotype through altered regulation of gene expression and is propagated throughout every growth cycle for the entire lifespan of this long lived species.The epigenetic memory may be realized through several molecular mechanisms including DNA methylation, and histone modifications affecting chromatin, as well as by small non-coding RNAs, and may also be related to the mechanisms silencing transposable or repetitive elements in the genome. MicroRNAs (miRNAs), endogenous small regulatory RNAs, are shown to be differentially expressed in genetically identically but epigenetically different progenies, in regards to the timing of bud burst and bud set (Yakovlev et al. 2010).We have started large scale studies using next regeneration sequencing approaches to identify and characterize the genes and regulatory elements involved in the initiation, maintenance, and heritability of the epigenetic memory. Epigenetic related changes in miRNA regulation during the establishment of the epigenetic memory are now studied in in vitro derived somatic embryos developing under cold (18C) and warm (30C) environmental conditions (that induce epitypes).We have constructed and sequenced 10 small RNA libraries during proliferation, maturation stage 1, 2 3 and the mature stage of embryo formation in the contrasted temperatures, in two control libraries during proliferation at 22C, as well as their mRNA transcriptomes using the Ion Torrent PGMTM (Life technologies) platform.We are expecting to determine at what stage(s) during embryogenesis the epigenetic memory marks are being laid down by identifying when the transcriptomic differences, of small RNA and mRNAs, between the epitypes are the most prominent during embryogenesis. The identification of novel miRNA candidates and the confirmation of conserved and novel miRNAs will be presented.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Lars Sandved DalenSammendrag
Ulik geologi og grunnforhold forklarer variasjonen i kvaliteten på beiteområde i Hedmark.