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.
1999
Forfattere
Jorunn Elisabeth OlsenSammendrag
Det er ikke registrert sammendrag
Forfattere
Bohumil Kucera Ragnar M. NæssSammendrag
Det er ikke registrert sammendrag
Forfattere
Erik TrømborgSammendrag
Det er ikke registrert sammendrag
Forfattere
V. Koski Jouni Partanen H. Hänninen Egbert BeukerSammendrag
Det er ikke registrert sammendrag
Forfattere
Harald Aalde P. GotaasSammendrag
Prosjektet ”Klargjøring av avvirkningsmuligheter i norsk skogbruk” er utført som et samarbeid mellom NIJOS, NORSKOG og skogoppsynet fylkesvis, representert ved seksjon skogbruk hos Fylkesmannens landbruksavdelinger. Prosjektet ble påbegynt i 1996. Denne rapporten tar for seg resultatene for Oppland. I rapporten er det redegjort for de mest sentrale forutsetningene som ligger til grunn for arbeidet. For en mer detaljert beskrivelse av opplegget henvises det til den nasjonale rapporten (NIJOS rapport 10/99).
Forfattere
Ketil KohmannSammendrag
1. Plantetypen 2M60 (toårig plante dyrket i pottebrettet M60) har hatt best overlevelse i de aller fleste forsøk. Den er også størst etter 3 – 4 vekstsesonger. Dette skyldes delvis at de var størst ved planting i de fleste forsøk. Høyde-tilveksten er imidlertid også størst i de fleste forsøk. Ved vårplanting er imidler-tid forskjellene til ettårig og toårig M95 ytterst små. 2. Plantetypen 1M95 (ettårig), enten den bare er dyrket i veksthus eller i kombinasjon veksthus/friland, har ved planting om høsten hatt stor avgang, mens den derimot ved vårplanting har klart seg på høyde med 2M95 (toårig). I sommerplantingsforsøkene i Trysil og Åsnes har den imidlertid klart seg dårligere (7–8 %). 3. Plantetidforsøkene på våren har vist at plantingen i månedsskiftet mai/juni ga litt større overlevelse og litt høyere planter enn planting i slutten av juni. 4. Ved sommerplanting (ca 5. juli) viser forsøkene at planter fra kjølelager drar nytte av en kondisjonering på friland på 14 dager før utplanting. Overlevelsen ved slik sommerplanting i første uke av juli har vært god med det toårige sortimentet. 5. Ett forsøk med seks felt viser at høstplanting først bør skje etter medio september når det plantes i stor høyde over havet. 6. Kortdagsbehandling om høsten før utplanting øket overlevelsen. 7. Overlevelse og vekst på markberedte felt er bedre enn ved planting direkte i vegetasjonen. 8. Ved sprøyting før planting bør det utvises forsiktighet slik at det går noe tid, trolig helst mer enn en uke på lett sandjord, før planting. 9. Forskjellen i plantekvaliteten (avgang og vekst) fra de tre planteskoler i Sør- og Nord-Trøndelag, Skjerdingstad, Stiklestad og Kvatningen planteskoler, var knapt målbar.
Sammendrag
DOC concentrations in soil water in podzols decreased from median values of 37 and 39 mg/l in the F and H layers, respectively, to about 6 mg/l in the B horizon. The decrease was most pronounced in the mineral soil. An increase in concentrations was found in the surface soils in late summer and autumn, apparently due in large part to increased production, which took place in both the canopy and the forest floor, although evaporative concentration of soil water could also have been partially responsible. In the B horizon, increased concentrations of DOC could be observed in the autumn, although these increases were much lower than for the surface horizons. A correlation was found between the surface soil DOC concentrations and the mean surface soil temperature 1 to 2 months previously, which could be due to the buffering effect of sorption processes. However, the increase in the net amount leached could not be clearly attributed to increased temperature. In the autumn, concentrations did not decline immediately when temperature decreased, which may be due to leaching of previously adsorbed organic matter. During the autumn, concentrations of DOC in streams increased in periods of high discharge due to increased input of high-DOC surface soil water. At the same time, DOC concentrations in surface soil water largely decreased, presumably as DOC was washed out. An increase in DOC was not seen in periods of high discharge in the early spring. The highest concentrations of TOC (both with and without flux-weighting) at the weir were also found in the autumn). Correlation of TOC in streamwater with temperature was poor but, for the winter months, often significant. A positive correlation in the winter was probably associated with higher fluxes due to temperature-induced snowmelt. DON, which is the dominant form of dissolved nitrogen at all depths in the podzols at Birkenes, also decreased sharply in concentration in the mineral soil. However, there was an increase in the concentration of DON relative to DOC. The C/N ratio thus decreased downwards in the soil, indicating a possible preferential adsorption of N-poor DOC. Much of the DON in throughfall appeared to be of low molecular weight. This was not the case for DON in soil water.
Forfattere
Kari Anne Sølvernes Gunnar OgnerSammendrag
The impact of climate change on a mini forest ecosystem was studied for three years in an open-top chamber (OTC) experiment with an outside control plot. Clones of Silver birch (Betula pendula Roth.) and Norway spruce (Picea abies (L.) Karst) were grown in monolithic lysimeters containing undisturbed profiles of podsolic forest soil. The original understory was also present.The soil temperature was increased with 2-3 C. The atmospheric CO2 concentration in the OTCs was ambient (380mol mol-1 CO2), approximately 500 and 700 mol mol-1 CO2. The leachates from the lysimeters was collected, and the solute concentration was analysed monthly.Increased soil temperature increased the mineralisation of soil organic matter, and large amounts of nitrate, dissolved organic nitrogen (DON) and aluminium were released. In the leachates from the 500 mol mol-1 CO2 birch lysimeters, high concentrations of Al were recorded during the second and third growth seasons.The high concentrations of Al were correlated with high concentration of total organic carbon (TOC) and increased pH. Large amounts of Al was organically bound in these leachates. The origin of the organic ligands could have been products of the birch roots, e.g. root exudates.
Forfattere
Harald Kvaalen M. AppelgrenSammendrag
We studied how light from different light sources influences germination and postgerninative growth of plants from somatic embryos and seeds of Norway spruce (Picea abies [L.] Karst).Somatic embryos of three spruce genotypes and seeds were subjected to light from commercially available light sources: Philips TLD Blue 18W/18 (BL), Osram Fluora (FL), Philips Cool White TL 50W/33 (CW), Osram Warm White 18W/30 (WW), Philips Yellow 36W/16 (YE) and Philips TLD Red 36W/15 (RE), 18 h a day, with a photon flux (PAR) at 30 mu mol m(-2) s(-1). After 6 weeks the germination frequencies of the somatic embryo-derived plantlets were 50% under BL and 98% under RE. The corresponding mean root lengths were 6.7 and 15.4 mm. In somatic embryo-derived plantlets cultured under BL, FL, CW and WW, both roots and hypocotyls turned brown, presumably due to production of phenolic substances. Browning was less severe in somatic embryo-derived plantlets cultured under RE and YE. Under RE, the epicotyl elongated in 37% of the plantlets after 6 weeks, compared with 70% under the other light sources. Seed germination and postgerminative seedling growth was modestly influenced by light from these light sources. RE and WW initially delayed germination as compared with BL, FL and CW, but after 2 weeks, more than 90% of the seeds had germinated under all light sources. In conclusion, germination and postgerminative growth of somatic embryos of spruce is sensitive to differences in light quality, whereas seed germination and seedling growth is not.
Forfattere
Tormod Stavrum Jan-Ole SkageSammendrag
Det er nå faktisk 5 år siden dette prosjektet ble omtalt i Norsk Pyntegrønt, nemlig i det aller første nummeret (1/94). Så nå er det på tide å skrive noen ord om det igjen, slik at leserene blir oppdatert. Svært mange av dere som leser dette er nok interessert i resultater snart, men vi må bare innse at det tar relativt lang tid å drive forsøk med trær