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
Forfattere
G.W. Axelsen L.J. Hyman R. Wheatley May Bente Brurberg P. Birch I.K. TothSammendrag
Det er ikke registrert sammendrag
Forfattere
Gunnhild Wærsted Takle Lisbeth J Hyman Ron Wheatley May Bente Brurberg Paul Birch Ian K TothSammendrag
Det er ikke registrert sammendrag
Sammendrag
The paper presents a new modified flashiness index which is based on hourly discharge measurements. This new index has been calculated for small agricultural catchments in Estonia and Norway respectively. A comparison has been carried out with results obtained from the Richards-Baker flashiness index, which is based on average daily discharge values. It is believed that an index based on hourly values and its comparison with the traditional index can reveal information about flow processes in the catchment. Such a comparison revealed large differences between the two index values for the Norwegian catchments, indicating large variations in discharge values over short periods or a "flashy" nature of runoff. These differences were not found for the Estonian catchments. At the same time large differences were found between the Norwegian and Estonian catchments. It is believed that the flashiness index and especially the comparison of the two different indexes, can be seen as an important tool in designing monitoring systems. In future work additional catchments will be included, both representing different sizes, land use and climate. The final goal is to be able to design a flashiness index on the basis of catchment characteristics such as land use, size, geo-hydrological settings and climatic conditions.
Sammendrag
The presence of Steinernema carpocapsae is reported for the first time in a Nordic country. Entomopathogenic nematodes were isolated from soil in apple orchards in Western Norway. Nematodes in the genus Steinernema were present in 11.9% of the samples including a population of S. carpocapsae. According to our knowledge the presence of S. carpocapsae is rare in northern Europe, and a report several years ago of this species from northern Sweden appears to have been S. feltiae not S. carpocapsae. This paper also presents an overview of entomopathogenic nematodes in the Nordic countries where the following species are reported: S. affine; S. bicornotum; S. carpocapsae; S. feltiae; S. intermedium; S. kraussei; S. silvaticum; `Steinernema sp. C1", `Steinernema sp. E"; Heterorhabditis downesii and H. megidis. The occurrence of entomopathogenic nematodes in the Nordic countries is based on area-wide surveys for some of the countries.
Forfattere
Gustav Fystro Tor LunnanSammendrag
NIRS (Nær-Infraraud Refleksjons-Spektroskopi) er dominerande metode for fleire sentrale analysar av grovfôrkvalitet. Den fysiske metoden er rask og kan gje mykje informasjon til låg kostnad. Kalibrering av NIRS-instrumenta er utfordrande, men nye tilnærmingsmåtar gjennom bruk av globale NIRS-databasar er lovande.
Forfattere
Trond HaraldsenSammendrag
Det er ikke registrert sammendrag
Sammendrag
We have made and partially sequenced two subtracted cDNA libraries, one representing genes predominantly expressed in a tree from an early-flushing family of Norway spruce (early-flushing library; EFL) and the second from a late flushing family (late flushing library; LFL), during 4 weeks before bud burst. In the EFL, expressed sequence tags (ESTs) encoding proteins of the photosynthetic apparatus and energy metabolism and proteins related to stress (abiotic and biotic) and senescence were abundant. ESTs encoding metallothionein-like and histone proteins as well as transcription factors were abundant in the LFL. We used quantitative real-time reverse transcription polymerase chain reaction to study the expression patterns of 25 chosen genes and observed that the highest levels of activity for most genes were present when plants were still ecodormant. The results indicate that the late flushing is not a result of a delay in gene activity, but is rather associated with an active transcriptional process. Accordingly, certain metabolic processes may be turned on in order to prevent premature flushing. We discuss the putative role of the studied genes in regulation of bud burst timing. Among the candidate genes found, the most interesting ones were the DNA-binding proteins, water-stress- related genes and metallothioneins. Expression patterns of some genes involved in chemical modification of DNA and histones indicate that epigenetic factors are involved in the timing of bud burst. In the obtained transcriptomes, we could not find genes commonly believed to be involved in dormancy and bud set regulation (PHY, CRY, ABI etc.) in angiosperm plants.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Thor Johannes Rogneby Ragnar Eltun Hanne HombSammendrag
Under forutsetning av at en lykkes med etableringen av hvitkløver, kan en underkultur med 10-20 % hvitkløver og 80-90 % engelsk raigras gi en meravling for korn i etterfølgende år på rundt 50 kg/daa uten at avrenningsfaren øker i særlig grad. Dette bekrefter at den fastsatte grensen på 15 vektprosent hvitkløver i underkulturblandinger med hvitkløver og engelsk raigras er rett valgt.
Populærvitenskapelig – Angreb af Phytophthora-arter
Venche Talgø, Arne Stensvand, Maria Herrero, ...
Sammendrag
Svampeslægten Phytophthora er et problem i juletræsdyrkningen i USA, og den er også fundet på Abies-arter i Norge. Hidtil er den ikke konstateret på arealer med juletræer eller klippegrønt i Danmark. Bekæmpelse er vanskelig.