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.
2011
Sammendrag
1. In the face of a rapidly changing environment, long-term studies provide important insights into patterns of vegetation and processes of change, but long-term studies are rare for many ecosystems.2. We studied recent vegetation changes at a fine scale in a Sphagnum-dominated bog in south Sweden by resurveying part of the bog 54 years after the original phytosociological survey. We used an indirect approach to identify changes in vegetation composition in relation to environment because of a lack of permanent sampling units. By applying a weighted averaging technique, we calculated relative changes in species optimum values for different environmental gradients as represented by indicator values for light, temperature, pH, moisture and nutrients.3. Species composition of the mire vegetation has changed significantly over the past five decades, as indicated by significant changes in species frequencies and species optima for the gradients examined. Species with lower indicator values for moisture and light and higher indicator values for nutrients have become more frequent on the mire. In particular, species of trees and dwarf shrubs increased in frequency, whereas typical mire species decreased (e.g. Trichophorum cespitosum (L.) Hartm.) or disappeared fromthe study site (e.g. Scheuchzeria palustris L.).4. Synthesis. Composition of the mire vegetation is found to be dynamic at different temporal and spatial scales. Increased air temperature and nutrient availability in south Sweden over the past few decades may have augmented productivity (e.g. tree growth), resulting in drier and shadier conditions for several species. This study successfully demonstrated the applicability of an indirect approach for detecting long-term vegetation change at a fine scale. This approach is an effective way of using historic and modern phytosociological data sets to detect vegetation and environmental change through time.
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag
Sammendrag
Første funn av askeskotsjuke (Chalara fraxinea) her i landet vart gjort i østfold i mai 2008 på småplanter av ask (Fraxinus excelsior) i ein planteskule, og har seinare spreidd seg raskt i låglandet vestover til og med Rogaland.
Forfattere
Jutta KapferSammendrag
Det er ikke registrert sammendrag
Sammendrag
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Sammendrag
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Forfattere
Halvor Solheim Martti VuorinenSammendrag
During a survey conducted in August 2009 in northern Norway, symptoms typical for red band needle blight (1) were observed in four young Scots pine (Pinus sylvestris) stands. The stands, less than 15 years old, were located in humid sites near rivers in Bardu and Målselv municipalities, Troms County. Many of the oldest needles (2- to 3- years-old) in the lower part of young trees were partially or completely brown, but still attached, and red bands could be observed. Aggregations of conidial stromata were often seen in the red bands. Conidia were hyaline, smooth, thin walled, and filiform, 1.9 to 2.6 μm wide and 12 to 36 μm long....
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Jon Anders Stavang Geo van Leuwen Eivind Vangdal Marit Espe Bjørn Tore Lunestad Amund MågeSammendrag
Fosfor er eit viktig næringsemne i all gjødsel og tilgong til dette mineralet er ein føresetnad for oppretthald av verdas landbruksproduksjon. Men dei kjende globale ressursane minkar raskt, og på sikt vil dette truge den globale matforsyninga. I Hardanger har Bioforsk, NIFES, LiftUp Aqua og Lingalaks gått saman i eit pilotprosjekt for å fange opp fosforrik feces frå opne merdar i sjø, for deretter å nytte slammet utan avsalting som gjødsel til planter. I eit forsøk under kontrollerte forhold har vi dokumentert ein positiv gjødselverknad på plantevekst av feces, og vi trur at marint fosfor kan verte ei viktig supplerande gjødselkjelde i framtidas landbruk.