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.
1998
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Bridget A. Emmett O. Janne Kjønaas Per Gundersen Chris J. Koopmans Albert Tietema D. SleepSammendrag
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Sammendrag
Det er ikke registrert sammendrag
Forfattere
Bridget Emmett D Boxman Michael Bredemeier Per Gundersen O. Janne Kjønaas Filip Moldan Patrick Schleppi Albert Tietema Richard F. WrightSammendrag
Det er ikke registrert sammendrag
Forfattere
Andries W. Boxman Kai Blanck Tor Erik Brandrud B. A. Emmett Per Gundersen Rene F. Hogervorst O. Janne Kjønaas Hans Persson Volkmar TimmermannSammendrag
Enhancement of the atmospheric N deposition is a serious threat for the structure and function of ecosystems. Here we evaluate the ecological effects of excess N with respect to changes in vegetation and soil biota in a series of experiments along a N gradient across Europe. The aim of this project (NITREX: N saturation EXperiments) is to assess the risk of N saturation and the reversibility of N saturation. At the experimental sites with a low-to-moderate input, N was added (n = 3), while at sites with a high input, N was removed by means of a transparent roof (n = 4). The experiments started between 1989 and 1991. Across the N gradient a positive correlation was found between the N concentration in deposition or soil solution with the N concentration in the needles and in general a negative correlation with the base cations K and Mg. In the N-addition plots there was a tendency towards a decreasing nutrient status of the needles, whereas at one site N-removal led to an improvement. Addition of N hardly affected fine-root biomass production, whereas signs of growth increase were recorded when the input was reduced. Tree growth was accelerated upon input reduction at two of three sites. Manipulation of N input did not alter the decomposition rate, although significant differences between sites were noted. Manipulation of the N input hardly affected the biomass of fungi and bacteria, but a negative relation between the N-addition and part of the soil fauna may be present among sites.
1997
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
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Sammendrag
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Forfattere
A. Tietema C. Beier P. H. B. deVisser B. A. Emmett P. Gundersen O. Janne Kjønaas C. J. KoopmansSammendrag
Det er ikke registrert sammendrag