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.

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1992

– After-effects of drought did not predispose young Picea abies to infection by the bark beetle-transmitted blue-stain fungus Ophiostoma polonicum

Erik Christiansen

Scandinavian Journal of Forest Research, 7 1992. 557-569

Authors

Erik Christiansen

Abstract

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.

– Systematic sampling of nonproductive land within stands

Erik Næsset

Meddelelser fra Skogforsk, 45.1 1992. 28 s.

Authors

Erik Næsset

Abstract

No abstract has been registered

– Symptoms of sulphur dioxide injury to some boreal plants

Dan Aamlid

In: Jalkanen, R., T. Aalto & M.-L. Lahti (eds.): Forest pathological research in northern forests with a special reference to abiotic stress factors. Extended SNS meeting in forest pathology in Lapland, Finland, 3-7 August, 1992, 1992.

Authors

Dan Aamlid

Abstract

No abstract has been registered

– Monitoring of forest vegetation in eastern Finnmark, Norway. - Lichen vegetation on birch trunks

Dan Aamlid

In: Tikkanen, E., M. Varmola & T. Katermaa (eds.): Symposium on the State of the Environment and Environmental Monitoring in Northern Fennoscandia and the Kola Peninsula, October 6-8 1992, Rovaniemi. Artic Centre Publications, 4 1992. 246-248

Authors

Dan Aamlid

Abstract

No abstract has been registered

– Critical attack level in Scots pine - a comparison between induced attack by Tomicus piniperda and different inoculation doses with its fungal assiciates

B. Långstrøm, Claes Hellqvist, Halvor Solheim

In: Living with insects, p. 424. Proceedings XIX International Congress of Entomology. Beijing 1992. (Abstract), 1992.

Authors

B. Långstrøm Claes Hellqvist Halvor Solheim

Abstract

No abstract has been registered

– The genus Keroplatus Bosc, 1792 - an interesting addition to the Norwegian fauna (Diptera: Keroplatidae)

Bjørn Økland, Geir E.E. Søli

Fauna Norvegica, Serie B, 39 1992. 85-88

Authors

Bjørn Økland Geir E.E. Søli

Abstract

No abstract has been registered

– Gårdsjön, Sweden

Arne Olav Stuanes, I. Andersson, Nancy B. Dise, ...

Ecosystems Research Report, 2 1992. 24-34

Authors

Arne Olav Stuanes I. Andersson Nancy B. Dise H. Hultberg O. Janne Kjønaas Per Holm Nygaard U. Nyström

Abstract

No abstract has been registered

– Soils and soil solution

O. Janne Kjønaas, Arne Olav Stuanes, Magne Huse

NIVA Report, 2694 1992. 23-30

Authors

O. Janne Kjønaas Arne Olav Stuanes Magne Huse

Abstract

No abstract has been registered

– Air pollution impact on forest and vegetation of eastern Finnmark, Norway

Dan Aamlid

In: Kismul, V., J. Jerre & E. Løbersli (eds.): Effects of air pollutants on terrestrial ecosystems in the border area between Russia and Norway, pp. 56-65. Proceedings from the first symposium, Svanvik, Norway 18.-20. March 1992. Norwegian State Pollution Control Authority, Oslo, 1992.

Authors

Dan Aamlid

Abstract

No abstract has been registered

– Map of critical loads/sulphur for coniferous forest soils in Norway

Tore Frogner, Richard Frederic Wright, B.J. Cosby, ...

Naturens talegrenser. Fagrapport, 33 1992. 30 s.

Authors

Tore Frogner Richard Frederic Wright B.J. Cosby Jacqueline M. Esser Arnt-Olav Håøya G. Rudi

Abstract

No abstract has been registered

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