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.
2005
Forfattere
Åshild Ergon Cheng Fang Øyvind Jørgensen Trygve S. Aamlid Odd Arne RognliSammendrag
The "BF14/16 x HF2/7" mapping population of meadow fescue (Festuca pratensis Huds.) was characterised for number of panicles produced by non-vernalised plants in the field, vernalisation requirement (number of weeks at 6°C and 8h photoperiod), as well as days to heading, number of panicles and proportion of shoots heading after a 12 weeks vernalisation treatment. Quantitative trait loci (QTLs) were identified and compared to QTLs and genes related to the induction of flowering in cereals and grasses. A region on chromosome 1F affected days to heading and the proportion of shoots heading. Chromosome 4F appeared to have several genes with a strong effect on vernalisation requirement. The strongest effects were located in the proximal end ofn 4F and may correspond to the earliness per se (eps) QTL eps6L.2 in barley and a heading time QTL in perennial ryegrass. A part of the meadow fescue ortholog of VRN1 was sequenced and mapped to another region of 4F that also had a strong effect on vernalisation requirement. The proximal end of chromosome 5F had QTLs for days to heading and proportion of heading shoots. Syntenic regions in wheat and barley contain eps-loci. A QTL for number of panicles in the field and a QTL for proportion of heading shoots were present on chromosome 6. A region on 7F affected the variation in number of panicles among plants without a vernalisation requirement, and is syntenic to regions in perennial ryegrass, barley and rice containing orthologs of A. thaliana CO.
Forfattere
Ievina SturiteSammendrag
I dette arbeidet, bruk av kvitkløver under nordlige klimaforhold har det blitt sett fra produksjons- og miljø perspektiver. De viktigste mål var å vurdere 1) på hvilket tidspunkt blader, stoloner og røtter dukker opp og omsettes; 2) i hvilken grad disse planteorganer taper N gjennom vinteren og hvor mye N gjenfinnes i sigevannet; 3) hvordan høsting påvirker både levetid av plantedeler og N dynamikken.
Sammendrag
Intensive harvesting, as compared to no harvesting, favoured N transfer to the leaves on the expense of stolon and root biomass production. Independently of treatment, about 75 % of the N present in leaves in the autumn was lost, while N stored in stolons and, particularly, in roots was conserved much better. However, the stolons of intensively harvested plants seemed to be less winter hardy and lost more N (55%) than did undisturbed (21%) and less intensively harvested plants (13%). Relative plant growth and N uptake rate in spring were almost equal for all treatments. The amount of inorganic N in soil after snowmelt and mineralization of white clover-derived N during the spring was small, suggesting that leaching and gas emissions may have been important N pathways.
Sammendrag
To better understand N cycling in white clover (Trifolium repens L) stands under northern climate conditions, we studied how harvesting regime affects plant longevity and N content in late autumn, ability to conserve N during winter and the fate of the lost N. Several field experiments were performed throughout four consecutive years using white clover plants (cv "Snowy") that were established from stolon cuttings or seeds. During the growing season, plants were treated and sampled destructively in late autumn, early spring the second year and after six weeks of new spring growth. Dry weight and N concentration were measured on all fractions. On additional experiments the longevity of main plant organs were monitored during two years and seepage water percolating throughout the above ground plant biomass was collected during four years. For harvested plants the repeated leaf removal and subsequent regrowth came at the expense of stolon- and root development and resulted in a reduced total plant N content in late autumn. During winter, root N was quite stable, as certain root dormancy occured, while approximately 80 % of the N present in leaves in autumn was lost - independent of treatment. Short leaf lifespan (less than 100 days) indicated that leaves are not genetically programmed to survive winter. Losses of N from stolons were lower, however, harvesting regime affected both the longevity and N losses. The amount of inorganic N in soil after snowmelt and mineralization of white clover-derived N through spring was low indicating that leaching and gas emissions might be important N pathways. The 26 % of lost N was found in seepage water.
Sammendrag
Resultater viser at høsteregimet influerer på kvitkløverens innhold av N om høsten, tapet av N fra stoloner gjennom vinteren, og akkumulasjon av N i nye blad om våren. Resultatene antyder også at N tapt fra kvitkløveren gjennom vinteren kan være svært mobilt.
Forfattere
Christian UhligSammendrag
Miljøovervåkning sigevann Ørndalen 2003-2004
Forfattere
Christian UhligSammendrag
Miljøstatus Ørndalen deponi 2005
Forfattere
Christian UhligSammendrag
Analyser og evaluering av treavfallet ved Tromsdalen avfallsmottak
Forfattere
Christian Uhlig Lars SvensonSammendrag
Forslag til beplanting av grustak i Alta
Forfattere
Helge Mundal Konrad Furset Lars SørdalSammendrag
Høymole er eit av dei mest brysame ugrasa vi har. Særleg i langvarig eng og beite er høymolen problematisk, den konkurrerer med kulturplantene om lys, næring, vatn og plass. Kvaliteten på eng og beite vert sterkt forringa når det er mykje høymole, på grunn av at planta er grov og lite smakleg. Dette ugraset er det såleis svært viktig å halde i sjakk om ein ynskjer god kvalitet på fòret.