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.
2011
Forfattere
Kjell Andreassen Nicholas Clarke Jørn-Frode Nordbakken Ingvald Røsberg Volkmar Timmermann Tonje ØklandSammendrag
Rapporten presenterer sammendrag av resultatene for 2010 fra tre overvåkingsprogrammer: “Overvåking av langtransportert forurenset luft og nedbør”, ”Overvåkingsprogram for skogskader” (OPS) og “Program for terrestrisk naturovervåking” (TOV). The report presents results for 2010 from three national monitoring programmes on long-range transboundary air pollution.
Forfattere
Christian PedersenSammendrag
Dammer og bekker er viktige småbiotoper i jordbrukets kulturlandskap. Ofte er det knyttet et spesielt dyre- og planteliv til disse landskapselementene. På grunn av intensivering av jordbruket ble mange av bekkene og dammene fylt igjen, og dyre- og plantearter mistet etter hvert leveområdene sine. Dette har medført at mye av det særegne dyre- og plantelivet har gått tilbake.
Forfattere
Gunnar WilhelmsenSammendrag
Det er ikke registrert sammendrag
Forfattere
Bernt-Håvard ØyenSammendrag
Med uttrykket klimaskoger menes skogkledde arealer som i et langsiktig perspektiv forvaltes for å oppta CO2 fra atmosfæren. Det er i kyststrøkene fra Rogaland til Finnmark at det i første rekke finnes arealer som kan benyttes som klimaskoger. Valg av treslag har svært stor betydning for CO2-binding...
Forfattere
Lars Sandved DalenSammendrag
I skogen pågår en intens kamp mellom barkbille og gran. Forskning avdekker hvordan treet forsvarer seg med biokjemiske våpen, mens barkbilla, hvis den får overtaket, kan felle enorme skogområder.
Sammendrag
A changing climate will likely influence the selection of tree species in the future, and this may in turn affect the size of the pools and fluxes of carbon. Tree species differ in growth rate, fine-root turnover and quality of litter and tend to produce different types of understory vegetation. In Sweden three tree species (Norway spruce [Picea abies] 43%, Scots pine [Pinus sylvestris] 39% and birch [Betula spp.] 11%) dominate. In the present study we used field experiments in southern Sweden to test if these tree species differed in root distribution and turnover.
Sammendrag
Biodiversity is assumed to have high value for many people, but the necessary preservation also incurs a cost for the forest owner. Typically, studies of this cost are at the stand level, and hence, not very accurate as the cost may vary even within the stand. In this work, we use a 1m×1m grid, generated from LIDAR data, to estimate the cost for harvesting and forwarding. The method could be utilized to calculate compensation, and to select between key woodland habitats to minimise the cost. In three of four test cases, the main cost was reduced harvested volume, but in one case the key woodland habitat also made the harvesting operations more expensive.
Forfattere
Daniele Castagneri Ken Olaf StoraunetSammendrag
A long-term increase in radial tree growth has been reported in tropical (Lloyd & Farquhar 2008), temperate (Spiecker 1996, Voelker et al. 2006), alpine (Rolland et al. 1998) and boreal forests (Hofgaard et al. 1999) over the last decades. Variations in forest growth patterns have been ascribed to different causes, such as longer growing seasons due to climate warming (Hu et al. 2010), changes in land management practices (Hunter & Shuck, 2002), nitrogen deposition (Magnani et al. 2007), and atmospheric CO2 enhancement (Voelker et al. 2006). Tree-ring analyses provide detailed information on the past growth of forests. In order to assess the effect of climate change on forest growth, non-climatic variation should be removed from treering series. The effect of endogenous (inter-tree competition) and exogenous (insects attacks, fires, storms, human influence, etc.) disturbances on tree-ring series can be detected and reduced by considering trees from different sites. Furthermore, as tree-ring width generally decreases as trees grow older and larger, age-related growth trend should be removed, to preserve climatic lowfrequency variability of chronologies. Different detrending methods used to remove non-climatic variations need to be adapted to the objectives of a particular study....
Forfattere
Kjell Andreassen Bernt-Håvard ØyenSammendrag
Fourteen Nordic increment functions have been validated by use of with a test data set from long-term research plots in Norway of even-aged, pure stands of Scots pine, Birch and Norway spruce. In selected functions from Denmark, Finland, Norway and Sweden measures of site productivity, mean tree size and various stand characteristics are represented. Different models display both strengths and weaknesses in their predicting ability. Some measures of precision and bias have been calculated and the functions are ranked due to their performance. Basal area increment models for spruce and pine from Sweden, and a Finish volume increment model for birch has the best fit to the Norwegian test data. Some of the growth models developed outside Norway estimate the growth with about the same accuracy as the models frequently used and developed in Norway. The results indicate that forest conditions and traditional even-aged forest management practice in the Nordic countries seem to have small influence on the relative growth of even-aged stands. By careful recalibration of existing functions from other Nordic countries with data from Norway, a reasonable accuracy could be achieved in Norwegian forest with a reduction of the bias.
Sammendrag
Askeskuddsjuke er på frammarsj i Norge og i Europa. I 2010 var det imidlertid ikke så dramatisk som året før, men på våre overvåkingsflater har vi registrert en liten nedgang i kronetetthet. Så det er all grunn til fortsatt bekymring. Det er stor forskningsaktivitet i mange land, og nå vet vi også hvilken sopp som er årsaken. I tillegg begynner det å komme rapporter om andre askearter som er mottakelige for sjukdommen.