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.
1992
Forfattere
Bjørn ØklandSammendrag
Det er ikke registrert sammendrag
Forfattere
Øystein AustaråSammendrag
Det er ikke registrert sammendrag
Forfattere
Alf BakkeSammendrag
Det er ikke registrert sammendrag
Forfattere
Arnstein Orlund Jarle BerganSammendrag
Det er ikke registrert sammendrag
Forfattere
Erik ChristiansenSammendrag
The defence of Norway spruce against a combined attack of the bark beetle Ips typographus and its associated blue-stain fungi is based upon a) constitutive resin stored in ducts of the bark and sapwood, and b) induced resinosis in reaction zones surrounding the point of infection. Empirically, beetle epidemics are associated with external stresses, drought being a particularly prominent factor. An attempt was made to mechanistically explain the apparent link between drought and infestations, through studying after-effects of drought on the induced defence in stressed trees. In the field, 3-5.5 m tall trees were exposed to artificial drought over three growth seasons to investigate whether this treatment would predispose them to fungal infection in a fourth season when drought was absent. Pre-dawn xylem water potentials down to -1.85 MPa and a considerable foliage depletion were recorded. In the fourth season, the trees were inoculated with Ophiostoma polonicum, a pathogenic associate of Ips typographus. No difference in susceptibility could be seen between drought stressed trees and unstressed controls. Carbohydrate concentrations of foliage and branch bark were slightly enhanced and mineral nutrient concentrations strongly reduced in stressed trees.
Forfattere
Erik NæssetSammendrag
Det er ikke registrert sammendrag
Forfattere
Dan AamlidSammendrag
Det er ikke registrert sammendrag
Forfattere
Birger HalvorsenSammendrag
Forest research has been officially organized in Norway for 75 years. The Forest Research Institute of West Norway, now located at Fana, south of Bergen, was established Jan. 1, 1916. This institution was privately financed until July, 1949, when the federal government took over. The Norwegian Forest Research Institute was established at s in 1917 as a government institution. On the occasion of their 50th anniversaries, both these institutions published comprehensive accounts, Reports of the Forest Research Institute of West Norway no. 41 (Bergen 1966) and Reports of the Norwegian Forest Research Institute vol. 24 (Vollebekk 1967), respectively. Those wishing to study more closely the origins and activities of the first 50 years of forest research are referred to these reports. In Nov. 1971, the Norwegian Parliament approved a new organizational system unifying forest research in Norway, to be known as the Norwegian Forest Research Institute. The organizational changes were initiated a year later with the incorporation of the following institutions: the Norwegian Forest Research Institute, the Forest Research Institute of West Norway, and the National Forest Survey. The latter had existed as an independent institution since 1919, and an account of the National Forest Surveys first 50 years was published in 1970. Thus, much of the forest research was established as a unit under common administration. However, a good deal of forest research is also carried out by the Forestry Institutes at the Agricultural University of Norway, partly to support their teaching, and partly in collaboration with the Norwegian Forest Research Institute. A cooperation and division of labor had gradually developed between the Forestry Institutes at the University and the Norwegian Forest Research Institute. This formed the basis for a comprehensive contract between the Agricultural University and the Norwegian Forest Research Institute, which was approved by the Department of Agriculture in 1990. This agreement resulted in the establishment of Skogforsk, which is the present designation for the official scientific and administrative collaboration between the Norwegian Forest Research Institute and the Department of Forestry of the University. The scientific cooperation consists of the personnel of the two institutions being grouped in common departments to carry out research and teaching. The administrative cooperation consists of, among other things, mutual board representation and cooperation in administrative tasks, data services, laboratories, equipment and other facilities. The aim of Skogforsk is to increase societys knowledge about the forest as an ecosystem, as well as about its use, protection and role in the economy and community life. Furthermore, Skogforsk facilitates efficient coordination and effective cooperation, as well as realization of research projects having broader goals than the institutions could have managed alone. The purpose of this special edition of Research paper of Skogforsk is to present important aspects of forest research in Norway during the last 25 years. The subject matter has been selected from a project list which each year includes ab. 120 different research activities. The final scientific reports from these projects are published either in one of the series, Communications of Skogforsk, Research papers of Skogforsk, or Bulletins of Skogforsk, or in another Norwegian or international series. A significant amount of work has been contributed by the individual authors, by the scientific editors, and, not least, by Consultant Birger Halvorsen, who has been responsible for the editing and for arranging the printing. On behalf of NISK I would like to thank everyone who has contributed to the result hereby presented. It is our hope that this publication will give an idea of the width and variety of current forest research in Norway, and that the contents will interest those assigning research tasks, collaborators, the business community, and the members of the public who use the forest and wilderness for recreation.
Sammendrag
Rapporten beskriver sammenhengen mellom viktige næringsstoffer i barnåler og noen viktige jordparametre på faste overvåkingsflater til Overvåkingsprogram for skogskader. Det er funnet signifikante sammenhenger mellom innholdet av flere plantenæringstoffer målt i nåler og i jordas humussjikt. For elementet kalium, et element som ved for lave konsentrasjoner forårsaker gulfarging av nåler, er det ikke en sammenheng mellom jordanalyser og planteanalyser. Kaliummangel er kanskje den mest hyppige årsak til gulfarging i norsk skog. Gulfarging av bar og blad er samtidig et viktig skogskadesymptom. Nåleprøver må derfor tas for å avdekke skogens kaliumstatus. Resultatene viser at jordanalyser ikke kan erstatte planteanalyser for å belyse skogens næringstilstand, og nåleanalyser kan heller ikke erstatte jordanalyser for å belyse skogsjordas tilstand. Ut fra en samlet vurdering ser det ut som elementinnholdet i nest siste nåleårgang best gjenspeiler næringsstatus i jorda. Forholdet mellom siste og nest siste nåleårgangs elementinnhold vil illustrere dynamikken i næringstilstanden.
Forfattere
Finn Roll-HansenSammendrag
Det er ikke registrert sammendrag