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.
2018
Sammendrag
Four lab scale biogas reactors fed with a substrate composition of ensiled fish waste and manure fixed at 13 and 87 vol %, respectively, were operated with HRTs of 20, 25, 30 and 40 days. Biogas process performance and stability were evaluated with regard to CH4 yields, NH4+ accumulation and abundance of NH4+-tolerant microorganisms. Process performance in the reactors operated at different HRTs were compared to process performance in reactors operated with constant HRT, fed with increased ratios of fish waste. The process performance and microbial dynamics were stable in reactors operated at constant amount of fish waste in the feed and with different HRTs. In the reactors added elevated ratios of fish waste, the concentration of NH4+ and abundance of NH4+-tolerant acetate oxidizing bacteria increased. The biogas process failed in these reactors simultaneously with an observed shift in microbial composition. In particular, the bacterium Tepidanaerobacter Acetatoxydans seemed to affect the biogas process stability. The hydrogenotrophic Methanomicrobiales increased in abundance in response to higher fish waste loading and NH4+ concentrations. This study showed that at a loading of 13% fish waste, it is possible to decrease the HRT from 30 to 20 days without markedly inhibiting the process stability.
Forfattere
Lars Sandved DalenSammendrag
Du må ikke si må I kronikken «Nok snakk og snarveier» i DN 2. februar dukker ordet «må» opp 13 ganger. Utfordringen til det vesle ordet er at det er så absolutt. Strengt tatt er det jo kun én ting vi må her i livet. Filosof Nina Karin Monsen påpeker i boken «Kunsten å tenke» at man bør utvise varsomhet i omgang med ordet «må». Hjernen vår oppfatter «må» som noe absolutt – noe vi faktisk må gjøre – det er liksom ingen vei utenom. Slike absolutter kan bli svært slitsomme i lengden – ikke minst for ledere og mellomledere som må både ditt og datt fra morgen til kveld. Det er lett å forstå skribenter som brenner for en sak, de vil gjerne at andre skal gjøre dette og hint. Men på samme måte som ansatte skaper unødig stress for sine kolleger ved å dele eposter sent om kvelden eller i helgene, vil ordet «må» – brukt i tekst, tanke og tale – påføre både deg selv og andre unødige belastninger. Det finnes en rekke alternative modale hjelpeverb som du burde kunne bruke.
Sammendrag
En ny, rimelig radiosender på 20 gram og med fem års batteritid kan redusere påkjørsler av reinsdyr på vei og jernbane.
Sammendrag
Sullii bealli buot toga vuojáhallamat 1985 rájes leat dáhpáhuvvan Nordlandsbanen alde, ja váttisvuohta lassána dadistaga.
Forfattere
Paul Eric AspholmSammendrag
De kan bli 280 år gamle, men har stort sett ikke formert seg de siste 30–50 årene. Klimaendringer kan gi massedød av elvemusling over hele Europa.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Per VesterbuktSammendrag
Det er ikke registrert sammendrag
Forfattere
Per VesterbuktSammendrag
Det er ikke registrert sammendrag
Forfattere
James Johnson Elisabeth Graf Pannatier Stefano Carnicelli Guia Cecchini Nicholas Clarke Nathalie Cools Karin Hansen Henning Meesenburg Tiina M. Nieminen Gunilla Pihl-Karlsson Hugues Titeux Elena Vanguelova Arne Verstraeten Lars Vesterdal Peter Waldner Mathieu JonardSammendrag
Acid deposition arising from sulphur (S) and nitrogen (N) emissions from fossil fuel combustion and agriculture has contributed to the acidification of terrestrial ecosys- tems in many regions globally. However, in Europe and North America, S deposition has greatly decreased in recent decades due to emissions controls. In this study, we assessed the response of soil solution chemistry in mineral horizons of European forests to these changes. Trends in pH, acid neutralizing capacity (ANC), major ions, total aluminium (Al tot ) and dissolved organic carbon were determined for the period 1995–2012. Plots with at least 10 years of observations from the ICP Forests moni- toring network were used. Trends were assessed for the upper mineral soil (10– 20 cm, 104 plots) and subsoil (40–80 cm, 162 plots). There was a large decrease in the concentration of sulphate (SO 2 4 ) in soil solution; over a 10-year period (2000– 2010), SO 2 4 decreased by 52% at 10–20 cm and 40% at 40–80 cm. Nitrate was unchanged at 10–20 cm but decreased at 40–80 cm. The decrease in acid anions was accompanied by a large and significant decrease in the concentration of the nutrient base cations: calcium, magnesium and potassium (Bc = Ca 2+ + Mg 2+ + K + ) and Al tot over the entire dataset. The response of soil solution acidity was nonuni- form. At 10–20 cm, ANC increased in acid-sensitive soils (base saturation ≤10%) indicating a recovery, but ANC decreased in soils with base saturation >10%. At 40–80 cm, ANC remained unchanged in acid-sensitive soils (base saturation ≤20%, pH CaCl 2 ≤ 4.5) and decreased in better-buffered soils (base saturation >20%, pH CaCl 2 > 4.5). In addition, the molar ratio of Bc to Al tot either did not change or decreased. The results suggest a long-time lag between emission abatement and changes in soil solution acidity and underline the importance of long-term monitor- ing in evaluating ecosystem response to decreases in deposition.
Forfattere
Habtamu AlemSammendrag
Det er ikke registrert sammendrag