Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2007
Sammendrag
No abstract has been registered
Sammendrag
No abstract has been registered
Sammendrag
No abstract has been registered
Sammendrag
Host tree terpenes can influence attraction of conifer-infesting bark beetles to their aggregation pheromones, and both synergistic and inhibitory effects have been reported. We tested a gradient of ratios of (–)-α-pinene, the predominant monoterpene in Norway spruce, to the pheromone of Ips typographus, a major pest of Norway spruce. Attraction of I. typographus increased as the release rate of (–)-α-pinene increased. The two highest (–)-α-pinene : pheromone ratios (526 : 1 and 2595 : 1) attracted twice as many I. typographus as pheromone alone, whereas low to intermediate ratios (56 : 1, 274 : 1) did not differ from pheromone alone. Our results are in agreement with a proposed model, which suggests that bark beetles display unique response profiles to host terpenes depending on the physiological condition of the host trees that they typically colonize. Ips typographus, which is an aggressive species capable of colonizing and killing healthy trees, showed an increased attraction to monoterpene : pheromone ratios, and this may be high enough to inhibit attraction of less aggressive beetle species typically colonizing dead, dying or stressed trees. Attraction of associates of I. typographus was also modified by (–)-α-pinene. Ips duplicatus, a competitor of I. typographus, showed increased attraction to the pheromone of I. typographus across all concentrations of (–)-α-pinene.
Forfattere
Guro Ådnegard Skarstad Laura Terragni Hanne TorjusenSammendrag
No abstract has been registered
Forfattere
Sanna Koutaniemi Tino Warinowski Anna Karkonen Edward Alatalo Carl Gunnar Fossdal Pekka Saranpaa Tapio Laakso Kurt V. Fagerstedt Liisa K. Simola Lars Paulin Stephen Rudd Teemu H. TeeriSammendrag
No abstract has been registered
Forfattere
Rune Slimestad Torgils Fossen Ingunn Molund VågenSammendrag
Slimestad, Rune har oppgitt Særheim Research Centre som adresse i posten/aa
2006
Sammendrag
By the end of 2006, Norway will need to decide whether to seek credits for 3.4 activities under the Kyoto Protocol, of which Cropland Management is one option. Electing cropland management as an Article 3.4 activity requires consideration not only of benefits in terms of greenhouse gas mitigation, but also synergies and conflicts with other environmental and agriculture policy goals like erosion control, biodiversity, protection of farmed landscapes and food production. Afforestation of farmed organic soils (peatlands) will have a substantial benefit in reducing CO2 and N2O emissions in the longer term, but is not eligible under Article 3.4 (as it would fall in under Article 3.3, Afforestation). Restoration of farmed peatland to its original state and natural conversion will also reduce emissions of CO2 and N2O in the longer term (time scale of decades), but CH4 emissions will increase. This increase in methane emissions and current uncertainty associated with all fluxes of emissions are the key arguments against such restoration as a climate mitigation measure. Energy crops will sequester carbon in soil. The climate and carbon credit benefits until 2012 would be small. Electing to undertake cropland management will require improved monitoring of soil organic carbon and greenhouse gas emissions, which can be costly. In light of small benefits and conflicts like increases in non-CO2 emissions and other environmental and agriculture goals as well as anticipated monitoring costs, electing cropland management for the first commitment period is not feasible. Cropland management as a mitigation strategy in future commitment periods would require better knowledge.
Forfattere
Aud Tennøy Jens Kværner Karl Idar GjerstadSammendrag
No abstract has been registered
Forfattere
Jens Kværner Bjørn KløveSammendrag
No abstract has been registered