Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2008
Sammendrag
Harmonization was achieved by carrying out joint sampling and assessment exercises at selected sites, inter-laboratory ring tests for the chemical analyses of deposition, plant and soil material, and by drawing up data compilation, data analysis and reporting guidelines and templates for the researchers working in the three countries.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
In the last few decades, it has been noted that the epiphytic lichen Usnea longissima appears to be declining in numbers throughout its previous distribution range in Scandinavia. Up until now, clearcutting forestry has been considered the main threat to its persistence. Suspecting that other threats also may be at work, we studied the fate of 20 U. longissima localities in undisturbed forest stands, surveyed in 1994–95 and subsequently in 2003–04, in the Nordmarka region, north of Oslo, Norway. Yearly λ was calculated to be 0.94 (95% CI = 0.91-0.97), both with respect to number of trees bearing the lichen and total number of thalli per locality. This corresponds to a 10-year decline of 46%, or a half-life of 11 years. No new establishments were recorded. Now being listed as Endangered (EN) in the revised Norwegian Redlist of 2006, all known localities will be protected from major forestry operations. However, without knowledge of additional threat sources, its future possibility for survival looks bleak. Possible negative factors are discussed, including air pollution, increasing tree canopy closure, inter-specific competition, and genetic depauperation.
Sammendrag
Whereas lichen growth rates have received considerable attention, comparatively few detailed studies of growth patterns have been carried out. Generally, most lichens seem to grow apically, with pseudomeristomatic tissue confined to lobe margins and branch tips. However, some species appear to retain the capacity to expand throughout the thallus. Such intercalary growth processes have proved difficult to confirm in the field for two- and three-dimensionally growing folious and fruticose forms. Using transplants of the conspicuous, one-dimensionally growing Usnea longissima Ach., we document that intercalary growth actually does occur, with thalli expanding geometrically in length with a doubling time of less than a year under favorable conditions.
Forfattere
Mari Mette Tollefsrud Roy Kissling Felix Gugerli Øystein Johnsen Tore Skrøppa Rachid Cheddadi W.O. van der Knaap Magorzata Lataowa Ruth Terhürne-Berson Thomas Litt Thomas Geburek Christian Brochmann Christoph SperisenSammendrag
Norway spruce (Picea abies [L.] Karst.) is a broadly distributed European conifer tree whose history has been intensively studied by means of fossil records to infer the location of full-glacial refugia and the main routes of postglacial colonization. Here we use recently compiled fossil pollen data as a template to examine how past demographic events have influenced its modern genetic diversity...
Sammendrag
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Sammendrag
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Sammendrag
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Sammendrag
Kjempebjørnekjeks er en fremmed art i Norge. Arten har negativ virkning på stedegent biologisk mangfold, og det er derfor behov for tiltak for å unngå ytterligere spredning. Plantene kan bekjempes med glyfosat (Roundup) eller ved oppgraving av rotstokker i mindre bestander. Dersom en ønsker å beholde en bunnvegetasjon av grasarter, er lavdosemidlene Harmony eller Harmony Plus effektive. Avkutting av stengler eller skjermkutting fører til ny vekst eller nydannelse av blomsterknopper.
Sammendrag
We investigated whether the stand age affects the life span of tree and understory fine roots (<1mm) in three Norway spruce (Picea abies) stands: 30, 60 and 120-yr-old. In each stand 9 minirhizotrons were installed and images were collected once in a month throughout the growing season during the three years. Norway spruce fine roots in the 30-yr old stand had a life span 401 ± 27 and 341 ± 68 days, and understory 409 ± 162 and 349 ± 142 days, estimated by using the Kaplan Meier survival analysis (KM) and Weibull distribution, respectively...