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.
2004
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Magne SætersdalSammendrag
Det er ikke registrert sammendrag
Forfattere
M.T. Sebastià A. Lüscher J Connolly R.P Collins I. Delgado A. De Vliegher P. Evans M. Fothergill B. Frankow-Lindberg A. Helgadóttir C Iliadis Marit Jørgensen Z Kad\"iuliene O. Nissinen D. Nyfeler C. PorquedduSammendrag
A common experiment was established in 39 sites in Europe, Australia and Canada within Working Group 2 of COST action 852 to 1) assess the benefits of grass / legume mixtures over monocultures, 2) test their stability and 3) evaluate the consistency of the observed patterns over broad environmental gradients. Results of the first harvest from 12 sites covering a North-South gradient from Iceland to Spain suggest that mixing grasses and legumes enhances productivity and increases the stability of the sward by reducing weed invasion. Mixing fast- and slow-growing grasses was found to provide yield benefits in a few sites, but mixing fast- and slow-growing legumes did not produce any effect. Effects of fast- and slow-growing species are expected to become more important over time, when succession of the species may increase the stability of the mixtures. The emerging patterns were quite consistent and, due to the large environmental gradient taken into account in this study, they are considered to be reliable.
Forfattere
G.T. Slavov G.T. Howe Igor A. Yakovlev K.J. Edwards K.V. Krutovskii G.A. Tuskan J.E. Carlson Steven H. Strauss W.T. AdamsSammendrag
Twenty-two highly variable SSR markers were developed in Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] from five SSR-enriched genomic libraries. Fifteen PCR primer pairs amplified a single codominant locus, while seven primer pairs occasionally amplified two loci. The Mendelian inheritance of all 22 SSRs was confirmed via segregation analyses in several Douglas-fir families. The mean observed heterozygosity and the mean number of alleles per locus were 0.855 (SE=0.020) and 23 (SE=1.6), respectively. Twenty markers were used in genetic linkage analysis and mapped to ten known linkage groups. Because of their high polymorphism and unambiguous phenotypes, 15 single-locus markers were selected as the most suitable for DNA fingerprinting and parentage analysis. Only three SSRs were sufficient to achieve an average probability of exclusion from paternity of 0.998 in a Douglas-fir seed orchard block consisting of 59 parents.
Forfattere
Bernt-Håvard ØyenSammendrag
Historien om kulturskogene i Hordaland er beskrevet.
Forfattere
K. R. RobertsenSammendrag
Det er ikke registrert sammendrag
Sammendrag
We estimated time from death to fall (standing time) of Norway spruce (Picea abies (L.) Karst.) snags in a submountainous old-growth forest in south-central Norway, applying four calculation methods to 124 dendrochronologically cross-dated still-standing snags and 64 fallen logs. The calculation methods consistently estimated expected standing time of snags at 26–34 years, with a median of 16–21 years and 20% of snags standing for >48–58 years. The survival function from all methods took the approximate form of a negative exponential, with a 3%–4% annual fall rate for snags. In the distribution of time since death, a small peak in dead trees 20–30 years ago (late 1970s) coincides with a historic epidemic of bark beetles. The method using only time since death of still-standing snags appears to be the most feasible for estimating total standing time of snags in old-growth forests with constant tree mortality.
Forfattere
Atle WibeSammendrag
Det er ikke registrert sammendrag
Sammendrag
Humlebladlus har plomme som vintervert og går vanligvis over til sommerverten humle uten å gjøre synderlig skade på plomme. Det er ser imidlertid ut til å være en økende tendens til at humlebladlus hos enkelte plommedyrkere når skadelige bestander også i plomme, med tilgrising av plommene med honningdogg og svertesopp som resultat. Artikkelen diskuterer mulige årsaker til denne utviklingen.
Forfattere
Steinar DraglandSammendrag
Humleplanten var tidligere en viktig vekst i norsk landbruk. Den ble brukt i forbindelse med ølbrygging og tekstilproduksjon, og som prydplante. For om lag 200 år siden minket interessen, og nå finnes humlen nesten bare som prydvekst i Norge. Rester av det tidligere mangfoldet holder på å forsvinne. Derfor har Nordisk Genbank støttet arbeidet med å samle inn og beskrive materialet. Det er nå en klonsamling i Finland, Sverige, Danmark og i Norge.