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.
2000
Authors
O. Nordal H. Blom W. WarnerAbstract
Det er ikke registrert sammendrag
Authors
Gustav FystroAbstract
The use of near infrared reflectance spectroscopy (NIRS) to predict potential carbon (C) and nitrogen (N) mineralisation in Norwegian grassland soils was investigated. Reference values of mineralisation were produced by aerobic incubation of soils, from which the course roots and stubble had been removed. NIRS was calibrated against 70 samples with a wide range in soil characteristics. Another 30 samples, taken from two other sites, were used to validate the predictive accuracy of the NIRS technique. A significant correlation was observed between the reference and NIRS values of potential C and N mineralisation on samples used during the calibration process. Increased error and significant bias occurred occasionally, when new samples were predicted. However, with site-specific calibrations the accuracy of performance was improved. The results of the comparisons with measured C and N mineralisation potentials, suggest that NIRS offers a promising alternative to otherwise time-consuming laboratory incubations, with the additional benefit of being a non-destructive analysis.
Authors
O.A. Rognli V. Alm C. Busso F. Cheng K. DevosAbstract
Det er ikke registrert sammendrag
Authors
Christian Thorstensen Olav Lode Agnethe ChristiansenAbstract
Utvikling av en fast fase ekstraksjonsmetode for fenoksysyrer og bentazon i vann. Sammenligning med en væske væske ekstraksjonsmetode
Abstract
Det er ikke registrert sammendrag
Authors
B. Darvas Arild Andersen A. Szappanos L. PappAbstract
Utviklingsbiologi og morforlogi blir beskrevet for havrebladminerfluas utviklingsstadier. Rikt illustrert.
Authors
Peder Gjerdrum Olav Albert HøibøAbstract
Utfør diametermåling etter barking. Dette er rådet til sagbruk som ikke er fornøyde med nøyaktigheten i sin sortering. Naturlig variasjon i barktykkelsen og avslitt bark på deler av omkretsen gjør diametermåling utenpå bark til en usikker operasjon.
Abstract
A rapid and sensitive method was developed to discriminate between Seiridium cardinale and Seiridium cupressi, the fungi causing severe cankers on common cypress in the Mediterranean area. The method amplified sequence variants in the ITS2 region of ribosomal DNA using the polymerase chain reaction (PCR), followed by polyacrylamide gel electrophoresis, to reveal single-strand conformation polymorphism (SSCP) between the two species. The greatest separation pattern was obtained with a gel matrix containing 7-10% formamide and 3-5% glycerol under optimized running conditions, which were found to be 30-40 V at 4-5 degrees C for 4-8 h. Sequence homology among isolates within each of the two species caused no mobility shifts, with all isolates displaying the same migration pattern. A few base differences between S. cardinale and S. cupressi caused markedly different migration patterns, allowing differentiation of the two pathogens. Differences between these fungi at the genetic level are consistent with known data on morphological, physiological and pathogenic characteristics. SSCP analysis constitutes a rapid and easy-to-perform method by which to recognize and distinguish closely related organisms, and has considerable potential for use in diagnosis and taxonomy.
Authors
Anne Moxnes Jervell Svein Ole BorgenAbstract
Det er ikke registrert sammendrag
Abstract
The beetle fauna of 299 sporocarps of the bracket fungus Fomitopsis pinicola in a 200 ha spruce forest in southeastern Norway was investigated in relation to sporocarp, tree and forest variables. The sporocarps contained 36 species of beetles, of which six species are on the Norwegian Red List. Of 12,373 individual beetles collected, 91 % were Cis glabratus. Plots of species accumulation curves suggested that there may be more than 60 beetle species present in F. pinicola in the area, but that probably all the specialist Ciidae were found. The major factor influencing beetle diversity turned out to be the level of dead wood at and in the vicinity of the sampling site, with a higher number of species per unit volume of sporocarps in areas with high levels of dead wood. There were also significantly more red-listed species in those areas. Analysing the species occurrence with stepwise logistic regression, we show preferential habitat selection of the six most abundant species of Ciidae. Conservation of beetles associated with bracket fungi using amount of dead wood as a surrogate measurement is discussed.