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
The objective of the study was to assess the influence of wood properties on copper leaching from wood treated with preservatives. Scots pine (Pinus sylvestris L.) trees were harvested from two different stands in Norway and one in Denmark. Sapwood was cut to samples (20 x 20 x 50 mm) in as many layers as the radial size allowed. Within this material, it is possible to trace the individual sample to its original position in the stem. Approximately half of the samples were treated with Wolmanit CX-8 and half with Tanalith. All samples were conditioned, impregnated with preservatives and leached according to EN84. Copper and boron content in water samples was determined by an ICP (Inductively Coupled Plasma) technique. The variation in leachability within trees, between trees and between different stands was studied. Statistical analyses showed that trees from the south are more prone to leaching and that samples from the lowest part of the tree fixate less preservative than those from the upper parts. In addition, drying method of the sample had an influence and differences were also noted between products used in the study.
Forfattere
Sissel Torre Knut Asbjørn Solhaug Meseret Tesema Terfa Jorunn Elisabeth Olsen Christopher Rodriguez Gautam Goutam Aruppillai Suthaparan Arne Stensvand Leiv Mortensen Hans Ragnar GislerødSammendrag
Denne artikkelen diskuterer mulighetene for bruk av LED lamper som vekstlys i veksthusproduksjonen.
Forfattere
Sissel Torre Knut Asbjørn Solhaug Meseret Tesema Terfa Jorunn Elisabeth Olsen Christopher Rodriguez G Goutam Aruppillai Suthaparan Arne Stensvand Leiv M. Mortensen Hans Ragnar GislerødSammendrag
Det er ikke registrert sammendrag
Forfattere
Sissel Torre Knut Asbjørn Solhaug Meseret Tesema Terfa Jorunn Elisabeth Olsen Christopher Rodriguez G Goutam Aruppillai Suthaparan Arne Stensvand Leiv M. Mortensen Hans Ragnar GislerødSammendrag
Det er ikke registrert sammendrag
Sammendrag
The species composition of wood-inhabiting fungi (polypores and corticoids) was investigated on 1138 spruce logs and 992 pine logs in 90 managed and 34 natural or near-natural spruce and pine forests in SE Norway. Altogether, the study included 290 species of wood-inhabiting fungi. Comparisons of logs with similar properties (standardized tree species, decay class, dimension class) in natural and managed forests showed a significant reduction in species number per log in managed spruce forests, but not in managed pine forests. The species number per log in managed spruce forests was 10–55% lower than on logs from natural spruce forests. The reduction was strongest on logs of large dimensions. A comparison of 200–400 spruce logs from natural and managed forests showed a 25% reduction in species richness corresponding to a conservative loss of ca. 40 species on a regional scale. A closer inspection revealed that species confined to medium and very decayed spruce logs were disfavored in managed forests, whereas species on early decay classes and decay generalists were unaffected. Similarly, species preferring large spruce logs were disfavored in managed forests. Forest management had strongest impact on low-frequent species in the spruce forests (more than 50% reduction), whereas common species were modestly affected. Corticoid fungi were more adversely affected than polypore fungi. These results indicate that wood-decaying fungi in pine forests are more adapted to forest disturbances than spruce-associated species. Management measures securing a continuous supply of dead wood are more important in spruce forests than in pine forests.
Sammendrag
Det vert i denne artikkelen gjort kort greie for sjukdomen lerrote og prosjektet "Jordbær uten lerrote til norsk konservesindustri" som starta i 2011.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Aspen (Populus tremula L.) is associated with high biodiversity and provides high-quality forage for wild browsing herbivores in boreal and temperate ecosystems. The long-term persistence of aspen in many regions in Scandinavia has been questioned due to the historically high browsing levels. We here review the basic ecology, genetics and life histories of aspen in a browsing context. Browsers can suppress the regeneration of aspen and the relatively short lifespan of the trees result in frequent regeneration cycles and concurrent exposure to browsers. In the long term, browsing may reduce recruitment and delay maturation, increase mortality and ultimately cause a decline of aspen. Norwegian forest inventory data indicate a reduced recruitment rate of young aspen (diameter at breast height; 60–79 mm) during the last 25 years, but it is unclear whether this is all due to browsing. Regeneration may also be hampered by lack of disturbance. Recent genetic studies have shown that aspen may have substantial regeneration by seeds, which allows for effective migration. The main conclusion of this review is that although browsing may affect demography and local abundance of aspen, it is very unlikely to lead to the eradication of the species in Fennoscandia.
Sammendrag
The effect of different light environments on trap catches of Frankliniella occidentalis and Trialeurodes vaporariorum was investigated in a commercial greenhouse rose production unit during late autumn. Two top light treatments were used: 1) High pressure sodium lamps (HPSLs) and 2) HPSLs and light emitting diodes (LEDs) with 20% blue and 80% red light. More thrips and fewer whiteflies were caught on yellow sticky traps, and more thrips were found in the flowers, in areas were LEDs were used in addition to HPSLs compared to areas where only HPSLs were used. No effect of the light treatments was found on the population level of Amblyseius swirskii, but a lower ratio of predatory mites to thrips was found on the plants where LEDs were used. The results suggest that using blue and red LEDs as interlighting, or otherwise supplementary to HPSLs, will change thrips and whitefly spatial distribution in the rose crop, and that natural enemy release rates probably need to be adjusted accordingly.