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.
2016
Abstract
Norway spruce (Picea abies (L.) Karst.) understory seedlings, growing in partially harvested plots with different canopy cover in a boreal spruce stand, were spot fertilized (Hydro 15-4-12) 9 years after planting. The principal aimwasto test the hypothesis that nitrogen (N)availability influences growthof understory seedlings at intermediate but not at lowlevels of irradiance. In addition, we tested the combined influences of N and light availability on selected morphological and phenological traits, covering a 2-year period after treatment. Diffuse radiation (DIFR) at the seedling level was estimated from hemispherical photographs and ranged from 19 to 46 per cent of DIFR in openconditions. Fertilizer applicationwasassociatedwithamarkedincreasein foliarNconcentration.Thefertilized seedlings grew better in height and root collar diameter compared with unfertilized controls. While the absolute growth in both diameterand height increased with increasing DIFR, seedlings also responded to improved nutrient availability across the rangeof light conditions studied. Fertilizer treatment did not affect thenumberof nodal buds, but we observed a higher apical dominance ratio and advanced bud burst in fertilized seedlings. In conclusion, nutrient availability influenced growth and bud phenology of understory Norway spruce seedlings at least down to 20 per cent DIFR.
Abstract
No abstract has been registered
Abstract
No abstract has been registered
Authors
Sabine Rosner Saskia Luss Jan Svetlik Kjell Andreassen Isabella Børja Lise Dalsgaard R. Evans Ole Einar Tveito Svein SolbergAbstract
There is evidence that recently occurring top dieback of Norway spruce (Picea abies (L.) Karsten) tress in southern Norway is associated with drought stress. We compared functional wood traits of 20 healthy looking trees and 20 trees with visual signs of top dieback. SilviScan technology was applied to measure cell dimensions (lumen and cell wall thickness) in a selected set of trunk wood specimens where vulnerability to cavitation (P50) data were available. The wall/lumen ratio ((t/b)²) was a quite good proxy for P50. Cell dimensions were measured on wood cores of all 40 trees; theoretical vulnerability of single annual rings could be thus estimated. Declining trees tended to have lower (t/b)² before and during a period of water deficit (difference between precipitation and potential evapotranspiration) that lasted from 2004 to 2006. The results are discussed with respect to genetic predisposition.
2015
Authors
O. Janne Kjønaas Nicholas Clarke Toril Drabløs Eldhuset Ari Hietala Hugh Cross Kjersti Holt Hanssen Tonje Økland Holger Lange Jørn-Frode Nordbakken Ingvald RøsbergAbstract
No abstract has been registered
Authors
John W. Hanna M.V. Warwell Helen Maffei M.L. Fairweather J.T. Blodget P.J. Zambino J. Worrall K.S. Burns J.J. Jacobs Aaron Smith S.M. Ashiglar J.E. Lundquist Mee-Sook Kim A.L. Ross-Davis C. Hoffman R. Mathiasen R. Hofstetter J.D. Shaw E.W.I. Pitman E.V. Nelson G.I. McDonald M.R. Cleary S. Brar B.A. Richardson N.B. KlopfensteinAbstract
No abstract has been registered
Authors
Aaron SmithAbstract
No abstract has been registered
Authors
Sabine Rosner Saskia Luss Jan Svetlik Kjell Andreassen Isabella Børja Lise Dalsgaard R Evans Ole Einar Tveito Svein SolbergAbstract
No abstract has been registered
Authors
Tuva Grytli Geoffrey Guest Carine Lausselet Francesco Cherubini Ryan Bright Per Kr. Rørstad Helmer Belbo Rasmus Astrup Øyvind Skreiberg Morten Seljeskog Franziska Goile Anders Hammer StrømmanAbstract
No abstract has been registered
Authors
Aaron SmithAbstract
No abstract has been registered