Record details

    Refractory organic carbon in C-depleted arable soils, as studied by 13C NMR spectroscopy and carbohydrate analysis
Statement of responsibility
    Rita Kiem, Heike Knicker, Martin Körschens, Ingrid Kögel-Knabner
Other titles
    Chemical structure and preservation processes of organic matter in soils and sediments (Variant.)
    Kiem, Rita
    Knicker, Heike
    Kögel-Knabner, Ingrid
    Körschens, Martin
    Symposium Chemical structure and preservation processes of organic matter in soils and sediments, 217th Annual Meeting of the American Chemical Society, 19990321-19990325
Other author; role
   Derenne, S.

   Knicker, Heike
Source title - serial
    Organic geochemistry
    Vol. 31, no. 7-8
    p. 655-668
    8 obr., 6 tab.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Org. Geochem.
Subject group
    nukleární magnetická rezonance
    studie experimentální
    uhlík organický
Geographical name
Abstract (in english)
   Soil organic matter (SOM) comprises refractory compounds, to which a turnover time of more than 1000 years has been atributed in SOM models. The goal of this study is to characterize the chemical structure of refractory compounds of organic carbon in arable soils by means of 13C NMR spectroscopy and analysis of carbohydrates. C-depleted soils that are expected to be enriched in refractory compounds are compared with fertilized soils from long-term agroecosystem experiments. In the C-depleted soils, lower proportions of O/N-alkyl C and higher proportions of aromatic and carboxyl C compared with the fertilized counterparts are observed. Ratios of alkyl to O-alkyl C are higher in the depleted soils than in the fertilized ones. Along with the overall C-depletion, the absolute amount of all carbon species was reduced. This net decrease is highest for the O/N-alkyl C and smallest for the aromatic C. Yields of wet and confirm the net decrease of O-alkyl C compounds along with C-depletion.
   The refractory organic carbon pool in arable soils appears to have a lower contributions of O/N-alkyl C, and a higher proportion of recalcitrant aromatic structures compared with more labile fractions of organic carbon
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    13. 4. 2007
Import date
    8. 8. 2012