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.
2001
Forfattere
R Langohr Tore SveistrupSammendrag
Loess soils have been studied under different landscape position and different landuse. . Special attention was paied to:pedality dynamics, clay-humus migration, traces of relict frost cracks and earth hummocks, calcified roots from the Ice Age.
Forfattere
Espen Haugland M. TawfiqSammendrag
Competition between established Dactylis glomerata or Festuca pratensis/Taraxacum officinale swards and seedlings of Trifolium pratense was studied under field conditions in Norway. Root competition from the Festuca pratensis/Taraxacum officinale sward was significantly greater than that from a Dactylis glomerata sward. The balance in root and shoot competition varied between experimental years because of variation in environmental conditions. In the first experimental year root competition had a greater effect on seedling dry weight than shoot competition, while the opposite was found in the second year. However, both root and shoot competition (full competition) in comparison with no competition gave proportionally the same effects in both years, indicating that an alleviation in root competition will be followed by intensified shoot competition. An increasing effect of shoot competition with time on plant dry weight was found. In a second experiment, seedlings of Lolium perenne and Trifolium pratense produced the highest plant dry weights in competition with an established Phleum pratense sward, followed by seedlings of Poa pratensis, Phleum pratense and Trifolium repens in decreasing order. However, no interactions between seedling species and competition treatments were found, indicating no differences in sensitivity between seedling species to competition from the established grass sward. The results are discussed in the context of renovating grassland by direct drilling.
Forfattere
Steinar DraglandSammendrag
Rosenrot (Rhodiola rosea spp. rosea L.) er viltvoksende over det meste av Norge. Den har minst tretti andre navn på norsk, og har i eldre tid vært brukt til mat og fôr. Den har blitt tillagt mange forskjellige medisinske egenskaper, men det er først etter 1990 at disse egenskapene har fått større oppmerksomhet i den vestlige verden. Ved Planteforsk Kise har en begynt med dyrkingsforsøk, og i Sverige er det en foredlingsbedrift som selger "Arktisk rot" med egenskaper som synes å være minst like positive som de en finner hos ginseng. Rosenrot er av interesse for parfymeindustrien, og den fungerer også som en sterk antioksidant. I denne litteraturoversikten finnes både en beskrivelse av planten og en kort omtale av innholdsstoffene. Det er vist til mulige bruksområder, og det er tatt med resultat og erfaringer fra dyrking av rosenrot under nordiske forhold.
Forfattere
Birger VenneslandSammendrag
The connection between rural economic development policy and forest policy in Norway during the past decades is discussed. Because of this connection it is debatable whether it is reasonable to maintain a strong focus on timber supply in Norwegian forest policy in the future. By analyzing studies related to forestry in the context of rural development, the lack of combined rural development research and forestry research is shown. It is argued that rural policy/research and forest policy/research should be combined in the future regarding topics related to forestry in the field of rural development.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Bart van GoolSammendrag
Det er ikke registrert sammendrag
Forfattere
A. NjøsSammendrag
Det er ikke registrert sammendrag
Forfattere
Sven-Gunnar Lunneryd Karl Inne Ugland Paul Eric Aspholm Paul Eric AspholmSammendrag
In Koster archipelago (northern Skagerrak, Sweden) the harbour seal population increased from approximately 350 to more than 1000 individuals between 1988 and 1998. During the same period, sealworm (Pseudoterranova decipiens) abundance in the most heavily infected fish species, bullrout (Myoxocepahulus scorpius) and sea scorpion (Taurulus bubalis), did not increase. Since harbour seals do not normally feed on those cottids an infection route via cod (Gadus morhua), which consume cottids, is proposed. The abundance of sealworm in the final host is therefore related to the probability of cod preying on infected cottids prior to being preyed upon by seals. Our model predicts that the abundance of larval sealworm in benthic fishes is not related to the number of seals when the colony is over a specific threshold size.
Forfattere
Christian Uhlig T Eldhuset M Christoph R HornSammendrag
Winter damage of meadows is a serious problem for agriculture in Norway. Unfavorable physical conditions for plant survival include freezing, desiccation, and ice/ water cover. Excess of soil water, particularly in winter and spring, is regarded as one of the most important factors causing heavy yield reduction and poor persistence. One of the major causes for the occurrence of seasonally waterlogged conditions in northern ecosystems is the development of a continuous frozen layer during the period of annual frost in the winter. During spring melting periods, the annual frost table gradually disappears and causes water from melting snow and thawing soil to accumulate in overlaying soil layers. Once the annual frost has dissipated, well-drained conditions may prevail. The present study investigated seasonal changes in soil redox potential and soil water chemistry at one cultivated and one non-cultivated site at Alta, Northern Norway. Soils at both sites were considered being comparable except for the present vegetation and land-use. The vegetation of the non-cultivated site, which was also the previous vegetation of the whole area before its cultivation started in 1930`s, was dominated by birches (Betula pubescens), while timothy (Phleum pratense) and smooth meadow-grass (Poa pratensis) dominated the cultivated site. At both sites platinum redox electrodes were permanently installed at 5, 10 and 25 cm depth. Furthermore, soil water samples were gained from permanently installed suction lysimeters from 5, 15 and 40 cm depth and analyzed for Fe. Redox potentials were generally lowest during spring thaw in May and June at both sites. At 5 cm depth redox potentials below +330 mV, the theoretical boarder line for the existence of oxygen in soils, prevailed until the second week of June, thus about one month after the disappearance of the snow cover. During this period Fe soil water concentrations at 5 cm depth increased from 0.5 to about 1.5 mg/l at the non-cultivated site, and from 0.5 to 4.5 mg/l in the cultivated soil. Results indicate that seasonally waterlogged conditions in northern ecosystems can cause unfavorable conditions for root growth, and thus might reduce the length of the potential growing season
Forfattere
Halvor Torgersen Torstein LislandSammendrag
Selvgående steinknuser STF 504. Det er gjennomført en litteraturgjenomgang og to studiereiser til Østerrike for å studere maskinen i praktisk arbeide. Maskinen ble først studert ved knusing av kalkstein, og deretter studert ved knusing av grunnfjellsbergarter. Prosjektets formål var å undersøke muligheten for å ta i bruk ny teknologi for å vedlikeholde skogsbilveger på en rimeligere og mer miljøvennlig måte. Resultatet etter vedlikeholdet med denne typen utstyr så lovende ut. Prisene for denne typen arbeid er svært gunstig i forhold til eksisterende metoder med stasjonære og mobile knuseverk. Metoden kan også beskrives som fleksibel og miljøvennlig. Maskinen resirkulerer det som ellers ville blitt deponert, og en slipper store massetak langs vegen. Maskinen er fleksibel siden det finnes en mengde andre anvendelsesområder. Den kan for eksempel brukes til resirkulering av bygningsavfall og innarbeiding av dette i vegkroppen. Den kan frese opp asfalt, slaghull eller gamle veger og parkeringsplasser som skal tilbakeføres til naturlig tilstand. Den kan også brukes til rekultivering av gamle jordruksarealer eller knuse stein på jorder.