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.
1993
Authors
Oddvar SkreAbstract
Seedlings of mountain birch and lowland birch were grown for two seasons in fertilized peat at two different elevations in south-western Norway at 60 N (50 and 450 meter). Seedlings from a local mountain birch population from western Norway were most successful at the high elevation site in terms of annual production, and had the highest C/N ratio, while the lowland population and the lowland birch seedlings showed the highest growth rates at the low-elevation site. The C/N ratios in these plants, however, were very low. It is concluded that the survival strategy is different at the two sites. At low-elevation sites the competition factor seemed to be the main selective force, and the most fast-growing plants were most successful, while at high elevations abiotic factors came into account, and a high source strength rather than high growth rates seemed to be the most important factor for plant survival. Chemical analysis of annual stemt tissue showed that all birch populations increased their concentrations of soluble sugars, soluble proteins and organic phosphorus in winter as a response to frowt hardening, the highest concentrations usually found in subarctic and subalpine populations.
Authors
Frans-Emil Wielgolaski Harald Opdahl Knut NesAbstract
No abstract has been registered
Authors
O. Janne Kjønaas Bridget A. Emmett Per Gundersen Chris J. Koopmans Albert TietemaAbstract
No abstract has been registered
Authors
O. Janne Kjønaas Bridget A. Emmett Per Gundersen Chris J. Koopmans Albert TietemaAbstract
No abstract has been registered
Authors
Åge A. NyborgAbstract
No abstract has been registered
Authors
Morten Løber Eyvind NygaardAbstract
No abstract has been registered
Authors
Martti Lindgren Maija SalemaaAbstract
No abstract has been registered
Authors
Rune EriksenAbstract
No abstract has been registered
Authors
Ulf SöderbergAbstract
No abstract has been registered
Authors
Svein SolbergAbstract
No abstract has been registered