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.
2006
Forfattere
Ann NorderhaugSammendrag
Det er ikke registrert sammendrag
Forfattere
Ann NorderhaugSammendrag
Det er ikke registrert sammendrag
Forfattere
Ann NorderhaugSammendrag
Det er ikke registrert sammendrag
Forfattere
Ann NorderhaugSammendrag
Det er ikke registrert sammendrag
Forfattere
Ann NorderhaugSammendrag
Det er ikke registrert sammendrag
Forfattere
Ann NorderhaugSammendrag
Det er ikke registrert sammendrag
Forfattere
V. Asheim J. Brendalsmo Ann NorderhaugSammendrag
Det er ikke registrert sammendrag
Forfattere
N.H. Sæther H. Sickel Ann Norderhaug O. VangenSammendrag
Det er ikke registrert sammendrag
Forfattere
Ian Toth L Moleleki L Pritchard H Liu S Humphris L Hyman Gunnhild Wærsted Takle May Bente Brurberg M Ravensdale E Gilroy PRJ BirchSammendrag
Det er ikke registrert sammendrag
Forfattere
Daniel Rasse Marie-france Dignac Haithem Bahri Cornelia Rumpel André Mariotti Claire ChenuSammendrag
Lignin has long been suspected a major source of stable carbon in soils notably because of the recalcitrant nature of its polyphenolic structure relative to other families of plant molecules. However, lignin turnover studies have produced conflicting results, most of them suggesting that large proportions of plant-residue lignin decompose within a year of incorporation into soils. Here, we propose a two-reservoir model where lignin in undecomposed plant residue (Lp) can either reach soil fractions where it is somewhat protected from further decomposition (Ls) or is transformed to non-lignin products. Model calibration data were obtained through compound-specific 13C isotopic analyses conducted in a zero- to nine-year chronosequence of maize monoculture after wheat in a temperate loam soil of the Paris basin. Lignin was quantified by CuO oxidation as VSC-lignin, i.e., the sum of vanillil- (V), syringyl- (S) and coumaryl-type (C) phenols. Model calibrations indicate that Lp has a turnover rate faster than one year and that 92% is mineralized as CO2 or transformed into other non-lignin products, while only 8% reaches the Ls fraction. Estimated turnover rate of the Ls fraction was 0.05 yr-1. The model also suggested that about half of Lp was not measured because it had been excluded from the samples in the process of sieving at 5 mm. In conclusion, the model indicates that chemical recalcitrance alone is not sufficient to explain VSC-lignin turnover in soils, and that, functionally, the most relevant mechanism appears to be the transfer of VSC-lignin molecules and fragments from decomposing plant tissues to soil-protected fractions.