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.
2013
Authors
Åshild Ergon Marina Azzaroli Bleken Tor Lunnan Arne Oddvar Skjelvåg Odd Arne RognliAbstract
No abstract has been registered
Authors
Åshild Ergon Marina Azzaroli Bleken Tor Lunnan Arne Oddvar Skjelvåg Odd Arne RognliAbstract
No abstract has been registered
Authors
Jolanda Roux Halvor Solheim Gilbert Kamgan Nkuekam Michael J. WingfieldAbstract
A survey to identify ophiostomatoid fungi that infect wounds on native Norwegian and Swedish broadleaved trees was undertaken during summer 2004. A fungus resembling a species of Sporendocladia was commonly isolated from the exposed cambium and inner bark of wounds. Morphological examination and comparisons of DNA sequence data for the ITS and 5.8S regions of the rRNA gene region led to its identification as Sporendocladia bactrospora. Pathogenicity trials on young Populus tremula and Betula pubescens trees showed that S. bactrospora is capable of causing lesions on these trees. There have been few previous reports of S. bactrospora, and in most cases, these have been as saprophytes on wood. In contrast, results of this study show that it is a common inhabitant of freshly made wounds on native broadleaved trees in Scandinavia, and it appears to contribute to staining of wood.
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No abstract has been registered
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No abstract has been registered
Abstract
A mountain pine beetle (MPB) epidemic is currently ravaging large areas of interior British Columbia (BC) with significant implications for ecosystem services including future timber supply and community economic stability. Information is needed on future stand dynamics in areas of impacted forests that are unlikely to be salvaged logged. Of greatest concern are stands dominated by lodgepole pine (>50% timber volume). Predicting how surviving trees in these areas respond and grow and the timing and species composition of natural regeneration ingress is of critical importance for multiple forest values. We undertook a retrospective study in the Flathead Valley of southeastern British Columbia where an intense MPB epidemic peaked in 1979–1980. Our objective was to gain insight into stand recovery and stand self-organization as influenced by species-specific growth responses of different sized secondary structure trees (individual seedling, sapling, sub-canopy and canopy trees surviving the epidemic) and post-beetle regeneration dynamics. MPB mortality rates, the percent of basal area killed by beetles, varied from 42% to 100% with most stands between 60% and 80%. In general, all surviving secondary structure released but the extent of growth release exhibited species variability. Release of surviving canopy lodgepole pine trees was often dramatic and greatest in stands with high total stand MPB mortality rates. Ingress of natural regeneration was slow in the first few years after MPB attack but there was a strong pulse of recruitment 10–20 years post disturbance which then slowed considerably. Nearly 30 years after the MPB attack, the stocking and composition of the understories have changed dramatically. Overall, the occurrence of the MPB epidemic resulted in more structurally and compositionally diverse stands leading to multiple successional pathways different from those of even-age pine dominated stands. The recovery and self-organization of unsalvaged natural stands in the Flathead Valley was a complicated process. It has provided insights for future forest management in areas impacted by the current massive MPB epidemic ongoing for the past decade in western North America.
Authors
Jan Alexander Augustine Arukwe Aksel Bernhoft Margaretha Haugen Gro Ingunn Hemre Ragna Bogen Hetland Torsten Källqvist Åshild Krogdahl Jørgen Fr Lassen Audun Helge Nerland Bjørn Næss Inger-Lise Steffensen Janneche Utne Skåre Leif Sundheim Ole Torrissen Olav ØsteråsAbstract
No abstract has been registered
Authors
Imke De Widt Jan Van den Bulcke Christian Brischke Christian Welzbacher Antje Gellerich Susanne Bollmus Miha Humar Katharina Plaschkies Wolfram Scheiding Gry Alfredsen Joris Van AckerAbstract
No abstract has been registered
Authors
Marianne Stenrød Kirsten Tørresen Ole Martin Eklo Anne K. Falk Øgaard Gudbrand Lien Karen Refsgaard Valborg KvakkestadAbstract
No abstract has been registered
Authors
Marianne StenrødAbstract
No abstract has been registered