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.
1995
Forfattere
Petter SnilsbergSammendrag
Det er ikke registrert sammendrag
Forfattere
Petter SnilsbergSammendrag
Lukket
Forfattere
A. Hovde Hans Olav EggestadSammendrag
Lukket
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Arne Olav Stuanes O. Janne Kjønaas Helga van MiegroetSammendrag
Nitrogen has been added to a forested 0.52 ha headwater catchment at Gårdsjön on the southwest coast of Sweden to study the ecosystem response to elevated nitrogen deposition. The catchment is dominated by naturally generated, mixed-age conifers, mainly Norway spruce, with Scots pine in dry areas. After a pre-treatment period of about 1 year, nitrogen was added to the whole catchment as ammonium nitrate by means of sprinklers at an intensity of 3 mm h-1 (average concentration 230 mmol N1-1). Total nitrogen input as throughfall to the catchment increased from the ambient 12.5 kg N ha-1 year-1 in the pre-treatment year to a total of 47.3 kg N ha-1 year-1 in the treatment years. Soil solutions were collected using tension lysimeters at four locations covering a moisture gradient from the dry upper to the wet lower parts of the watershed. Results from these locations were compared with soil solution composition at two locations in a nearby control catchment. After 2 years of nitrogen addition, the volume-weighted average nitrate concentrations in the treated catchment were higher than the pretreatment values, especially in the upper soil. Concentrations showed a progressive increase over time. The lack of the same increasing trend in the control catchment precludes natural variations in climatic conditions as the main cause for this increase. Relative to inputs, nitrate concentrations in soil solution were low and showed large variations between the drier and wetter locations. Differences in nitrate concentrations between pre-treatment and treatment periods declined with soil depth, indicating that most of the added nitrogen was consumed in the upper soil. The results from soil solution do not indicate increased nitrogen leaching below the rooting zone in the treated catchment and thus based on these results alone there is as yet no indication of nitrogen saturation.
Forfattere
Bjørn ØklandSammendrag
Det er ikke registrert sammendrag
Forfattere
Vincent R. Franceschi Trygve Krekling Alan A. Berryman Erik ChristiansenSammendrag
Det er ikke registrert sammendrag
Forfattere
Sverre SkoklefaldSammendrag
Det er ikke registrert sammendrag
Forfattere
Erik Christiansen Alan A. BerrymanSammendrag
Det er ikke registrert sammendrag
Forfattere
Kari Korhonen Katriina LipponenSammendrag
Det er ikke registrert sammendrag