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.
2006
Sammendrag
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Sammendrag
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Forfattere
Line E. Sverdrup Roar Linjordet Gjermund Strømman Snorre Hagen Cornelis A.M. van Gestel Åsa Frostegård Roald SørheimSammendrag
The effect of zinc on soil nitrification and composition of the microbial community in soil was investigated using a full factorial experiment with five zinc concentrations and four levels of biological complexity (microbes only, microbes and earthworms (Eisenia fetida), microbes and Italian ryegrass (Lolium multiflorum var. Macho), and microbes, ryegrass and earthworms). After 6 weeks of exposure, the activity of soil nitrifying bacteria was measured and the microbial community structure was characterized by phospholipid fatty acid (PLFA) analysis. Soil nitrification and several PLFA markers were significantly influenced by either zinc addition and/or the presence of earthworms or ryegrass, and one of the most pronounced changes was the increase of fungi and decrease of bacteria with increasing concentrations of zinc. Of particular interest, however, was the potential interaction between the presence of plants and/or earthworms and the effect of zinc, which the factorial study design allowed us to explore. Such an effect was observed in two cases: Earthworms reduced the positive effect of zinc on the fungal biomass (ANOVA, p = 0.03), and the effect of earthworms on the soil nitrification activity depended on zinc concentration (ANOVA, p < 0.05). The effect of earthworm presence was not very large, but it does show that multispecies tests might give information about metal toxicity, or bioavailability that cannot be predicted from single-species tests. (c) 2006 Elsevier Ltd. All rights reserved.
Sammendrag
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Sammendrag
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Sammendrag
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Sammendrag
Results from a literature review on pinewood ecology, silviculture, genetics, aspects of history and forest resources of Scots pine (Pinus sylvestris L.) in western Norway are presented. The pinewoods cover 40 per cent of the forested land, 0.31 million ha. During the last 75 years, the area has increased by 17 per cent and the growing stock has risen from 10 to 34 million m3. The impact of man in previous times was very marked, and has had a significant influence on the present forest conditions. The pronounced climatic gradients mixed with the topographic variation - from the coastal plains via the fjord systems to the high mountains - is reflected in rather steep gradients in the pine forest vegetation. Various floristic elements can be distinguished, from oceanic via the suboceanic in the outer islands to the thermophytic, boreonemoral and boreal elements in the inner fjord districts and valleys. The introduction of spruce (Picea spp.) plantations on 10-15 per cent of former native pine forests has not negatively affected the bird fauna at the landscape scale. Although not particular species rich, the pine forests harbour species usually not found in other forest types. So far, most work in the field of silviculture and forest ecology in the pinewoods of West Norway has been in the form of case studies. Implications of the results for forestry in the region are briefly discussed.
Forfattere
Harald Bratli Tonje Økland Rune Halvorsen Økland Wenche E. Drarnstad Rune Halvorsen Økland Reidar Elven Gunnar Engan Wendy Fjellstad Einar Heegaard Oddvar Pedersen Heidi SolstadSammendrag
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Sammendrag
Det finst fleire arter blåbær som kan dyrkast, men i Noreg er Vaccinium myrtillus dominerande. I Kanada har dei utvikla dyrkingsteknikken for blåbær dei siste 50 åra, og i dag er det ein stor blåbærproduksjon der. Bæra vert husta både mekanisk og med enklare utstyr, men både ugras og utttørking er betydelege utfordringar.
Sammendrag
Kultivering av ville blåbær, som canadierne kaller "lowbush blueberry", foregår i det østlige Canada i provinsene New Foundland, New Brunswick, Nova Scotia, Prince Edward Island og Quebeck. Den største produksjonen er i Nova Scotia, som produserte 18000 tonn til industrien i 2005, etter å ha startet i det små for mer enn 50 år siden. Vi var tre forskere fra Bioforsk som var så heldige å få midler fra Norges forskningsråd, for å knytte kontakter i Canada og lære om det de har fått til innen forskning og utvikling på ville bær. Vi besøkte i nevnte rekkefølge provinsene New Foundland, Nova Scotia og Quebec, og ble svært godt mottatt.