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.
1999
Authors
Jan Svejgaard JensenAbstract
No abstract has been registered
Authors
Oddvar SkreAbstract
The Nordic Subarctic-Subalpine Ecology (NSSE) network was initiated among the Nordic countries in 1977. It was the first joint research initiative under the MAB umbrella in this area and was called the Subarctic Birch Project (SBP). Since the scientific basis for proper ecological planning and use of the subarctic-subalpine birch forest zone was defective in many fundamental areas, the studies were in the forst phase concentrated on basic research in genetic, physiological and ecological adaptations of mountain birch and the interactions between birch and herbivores. The second phase of the study was started in 1989. The aim of this phase is to investigate the response of genetically variant mountain birch, drawn from different provenances, to alterations in climate and nutrients. From these data models of the reaction of mountain birch to global change can be developed. The project group now consists of over ten researchers from Norway, Sweden and Finland. The main organizations participating in the project are: Norwegian Forest Research Institute, Finnish Forest Research Institute, University of Oulu, University of Troms, Abisko Scientific Research Station and Kilpisjrvi Biological Research Station
Abstract
The objective structure of parameters of soil acidity and cation exchange properties of podzols affected by the emission of the Pechenganikel factory (the Kola Peninsula) is revealed. The multiparametric analysis of soil properties and the traditional correlation analysis complement one another. They point to the complex character of interrelations between soil properties in conditions of progressing human-induced acisification.
Authors
Jan Mulder J.F. Gallardo E. Matzner Edward Tipping Charlotte Bryant Nicholas Clarke S. Lofts B. Michalzik M.A. VicenteAbstract
No abstract has been registered
Abstract
No abstract has been registered
Authors
Jan Erik SundbyAbstract
No abstract has been registered
Authors
D. LindgrenAbstract
No abstract has been registered
Abstract
A field experiment was carried out to test the hypothesis that treatment of Norway spruce trees with the Ips typographus-transmitted blue-stain fungus Ceratocystis polonica enhances tree resistance to later mass attack by this bark beetle. Twenty-five mature trees were pre-treated by inoculating a non-lethal dose of the fungus into the bark, while 18 trees served as untreated controls. Three and a half weeks after treatment a bark beetle attack was initiated by attaching dispensers with I. typographus pheromone to the tree trunks. A significantly larger proportion (67%) of the control trees than of the pre-treated trees (36%) were killed by the beetle attack. The result is discussed in relation to recent results regarding defence mechanisms in Norway spruce trees.
Authors
Gro HylenAbstract
Age trends of phenotypic, environmental, and additive genetic variance and heritability were estimated for overall density and its components earlywood and latewood densities and latewood proportion. The objective was to acquire information for both individual and cumulated rings from ring number 3 to 12 counted from the pith. Age-age correlations were calculated for cumulated density traits only. The wood density data were obtained with X-ray analysis of increment cores from 47 open-pollinated families of Norway spruce (Picea abies (L.) Karst.). The families had earlywood and latewood with significant differences in density for individual and cumulated rings and consequently for overall density. The latewood proportion had significant family variation for cumulated rings but not for all individual rings. Large fluctuations in environmental variance caused fluctuations in heritability estimates for successive rings. A strong decrease in environmental variance for all cumulated traits, especially from ring 3 to 5, resulted in a steady increase in heritability estimates. The latewood density had the highest heritability estimates and latewood proportion the lowest for both individual and cumulated rings. Overall density and the cumulated components at cambial age 12 showed strong genetic correlations with their respective traits at all younger ages.
Authors
Per Gerhard Ihlen B.J. CoppinsAbstract
Arthothelillm lirellans and A. orbilliferum are reported new to Scandinavia. Both species were found in Hordaland, western Norway. Their ecology and European distribution are discussed, and distribution maps presented.