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.
2003
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Dominik Röser Antti Asikainen Simen Gjølsjø B. Jaskelevicius D. Johansson P. Jylhä L. Kairiukstis I. Konstantinova Jørn Kristian Lileng Anders Lunnan M. Mandre Juha Nurmi H. Pärn T. Saksa L. Sikanen Kjell Suadicani M. Totopainen L. VilkristeSammendrag
The report is investigating the current state of forestry, forest industries and the bioenergy sector in Denmark, Estonia, Finland, Latvia, Lithuania, Norway and Sweden. The main task of the research is to illustrate the current supply and use of wood based fuels in the Baltic and Nordic countries. Additionally the present use of forest fuels in the different countries in the private and industrial sector is analyzed and bottlenecks in the current supply of forest fuels are identified. The focus on energy policy has been on energy systems with less CO2 emissions in order to meet requirement of international agreements. Therefore, forest fuels offer great potential as a source of renewable energy. There has been a steady increase in the growing stock of European forests. Large amounts of residues are left unutilised both in Nordic and Baltic forests, especially in first thinnings and intermediate cuttings. They offer large potential to further increase the share of wood fuels in total energy consumption. Forest industries utilize a great share of wood residues at present but especially in Baltic regions there is potential to intensify the use of wood residues. An additional increase in wood biomass utilization is also dependent on future expansion of the district heating networks in Nordic and Baltic countries. Potential is available especially in the Baltic countries and Norway. The situation in regards to utilization of wood biomass in private dwellings is similar in all seven countries. Large amounts of fuelwood are consumed annually but new furnace and burner technology is necessary to use resources more efficiently. In regards to energy policy a lot has been done to improve the use of biomass utilization, but more has to be done to strengthen the position of forest fuels in the future. The main bottlenecks for the larger use of forest biomass were found to be a lack of utilisation of available technology for harvesting and transport operations and a lack of district heating. An improved use of technology would decrease the price of forest fuels, necessary to compete with fossil fuel prices on international markets.
Forfattere
Guillaume Besnard Virginie Acheré Sylvain Jeandroz Øystein Johnsen Tore Skrøppa Patricia Faivre Rampant Jean-Michel FavreSammendrag
Det er ikke registrert sammendrag
Forfattere
Harald Kvaalen Ola Gram Dæhlen Ulrika EgertsdotterSammendrag
Det er ikke registrert sammendrag
Sammendrag
Mortality, injury and height growth of planted Picea abies (L.) Karst. were examined in a six-year period in eight stands in southeast Norway. There were four residual stand densities (shelterwoods of high, medium and low density, 25 x 25 m patch cut) combined with three scarification treatments (unscarified, patch scarification, inverting) in a split-plot design. Mortality was generally low during the experimental period, and did not differ significantly between the residual density treatments (mean=11.1%). Both survival and plant height after 6 years were improved by inverting, while patch scarification was intermediate but not significantly different from the unscarified alternative. The patch-cutting resulted in the tallest plants, while only minor differences in height growth were found between the shelterwood treatments. The frequency of injured plants after six years was not significantly affected by the treatments (mean=10.6%). The improved plant establishment with inverting in this study is in agreement with previous studies on clear-cuts.
Forfattere
Per Otto Flæte Erlend Ystrøm HaartveitSammendrag
Det er ikke registrert sammendrag
Forfattere
H. Mäkinen P. Nöjd H.P. Kahle U. Neumann Bjørn Tveite K. Mielikäinen H. Röhle H. SpieckerSammendrag
High-frequency variation of Norway spruce radial increment [Picea abies (L.) Karst.] and its dependence on various climatic variables was compared in stands across latitudinal and altitudinal transects in southwestern and eastern Germany, Norway, and Finland. The tested variables included local temperature and precipitation, northern hemisphere temperature anomalies, and the climatic teleconnection patterns (North Atlantic Oscillation, East Atlantic, East Atlantic Jet, East Atlantic/West Russia, and Scandinavian patterns). Climatic impact on radial increment increased towards minimum and maximum values of the long-term temperature and precipitation regimes, i.e. trees growing under average conditions respond less strongly to climatic variation. Increment variation was clearly correlated with temperature. Warm Mays promoted radial increments in all regions. If the long-term average temperature sum at a stand was below 1,200-1,300 degree days, above average summer temperature increased radial increment. In regions with more temperate climate, water availability was also a growth-limiting factor. However, in those cases where absolute precipitation sum was clearly related to radial increment variation, its effect was dependent on temperature-induced water stress. The estimated dates of initiation and cessation of growing season and growing season length were not clearly related to annual radial increment. Significant correlations were found between radial increment and climatic teleconnection indices, especially with the winter, May and August North Atlantic Oscillation indices, but it is not easy to find a physiological interpretation for these findings.
Forfattere
Tove M. Østensvik Kaj Bo VeierstedSammendrag
Det er ikke registrert sammendrag
Forfattere
Per Otto Flæte Erlend Ystrøm HaartveitSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag