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
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
Gunnar Ogner Kari Anne SølvernesSammendrag
The impact of elevated CO2 and increased temperature on the soil of a mini forest ecosystem was investigated in an open-top chamber experiment. The CO2 treatments of the OTCs were ambient, 500 and 700 mmol CO2 mol-1 with an ambient outdoor control. All soils were warmed by natural air flow and radiation to a temperature 2-3 C above a corresponding forest soil site. Overheating was prevented by a cooling system. Silver birch and Norway spruce were planted in undisturbed soil monolithic profiles, with their original understory, in lysimeters and compared to a lysimeter control with understory only. Soil samples were collected in the forest at the end of the experiment and used as reference samples. Increased temperature was found to cause the greatest effect on soil. All data clearly indicated increased breakdown of the soil organic matter with increased temperature. The breakdown of raw humus gave a decrease in concentration of total C, total N, and in the exchangeable plus extractable elements (org.-C, Ca, K, Mg, Mn, t-P and t-S) relative to the original forest reference soil in the range of 18 - 57 %. The exchangeable plus extractable elements (Al, Fe, Si, NH4-N and org.-N) from the raw humus layer increased in concentration relative to original forest soil by 28 - 96 %. The effect of different vegetation on soil quality was less than for the temperature increase. Birch had the strongest effect by decreasing soil acidity and the concentration of exchangeable Al throughout the soil profile relative to spruce. Birch also increased weathering of mineral soil relative to spruce. The effects of CO2 treatment on the soil were clearly smaller than for the temperature and vegetation parameters. Elevated CO2 gave increased concentrations of exchangeable plus extractable Zn, organic C and organic N for the raw humus layer of the understory and spruce vegetation relative to the raw humus of the birch lysimeters. Principal component analysis of the complete data set indicated an effect of elevated CO2 on the humus layer relative to the ambient treatments. This effect was seen most clearly in the lysimeters with understory vegetation.
Forfattere
Magne SætersdalSammendrag
Det er ikke registrert sammendrag
Forfattere
Toril Håkestad KristiansenSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Leiv Mortensen Hans R GislerødSammendrag
The influence of three reative air humidities and two lighting periods on growth, vase life and leaf-water relations was studied in 14 rose cultivars.It is concluded that high air humidity and continuous lighting in general should be avoided in the production of greenhouse roses.
Forfattere
Svein Solberg E BøeSammendrag
A survey among onion (Allium cepa L.) growers and extension officers in Toten, Norway, was carried out during the period 1981-1995. The study was used both to describe trends in onion crop management and to pinpoint some factors related to total post-harvest losses due to watery scales (WS). The occurence of WS increased during the first part of the 1980"s. Annual variations in watery scales can be explained by meteorological data. Years with high precipitation in August and September had the highest frequency of WS. A positive correlation between rainfall during the 3 last days of field curing and WS was found. High air humidity could also be ralated to high occurence of WS.
Forfattere
M.J. Latkowska Harald Kvaalen M. AppelgrenSammendrag
Det er ikke registrert sammendrag
Forfattere
Geir I. Vestøl Francis Colin Michel LoubéreSammendrag
Det er ikke registrert sammendrag
Forfattere
Geir Wæhler GustavsenSammendrag
Det er ikke registrert sammendrag