Podrobnosti záznamu

Název
    Refractory organic carbon in C-depleted arable soils, as studied by 13C NMR spectroscopy and carbohydrate analysis
Údaj o odpovědnosti
    Rita Kiem, Heike Knicker, Martin Körschens, Ingrid Kögel-Knabner
Další názvy
    Chemical structure and preservation processes of organic matter in soils and sediments (Variant.)
Autor
    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
Další autor; role
   Derenne, S.
   Původce

   Knicker, Heike
   Původce
Jazyk
    anglicky
Zdrojový dokument - seriál
    Organic geochemistry
Svazek/č.
    Vol. 31, no. 7-8
Strany
    p. 655-668
Rok
    2000
Poznámky
    8 obr., 6 tab.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Org. Geochem.
Předmětová skupina
    cambisol
    černozem
    dusík
    luvisol
    nukleární magnetická rezonance
    půdy
    studie experimentální
    uhlík organický
    uhlovodíky
    zemědělství
Geografické jméno
    ČR-Čechy
    Polsko
    Praha
    SRN
Klíčové slovo
    13C
    Analysis
    Arable
    C-depleted
    Carbohydrate
    Carbon
    NMR
    Organic
    Refractory
    Soils
    Spectroscopy
    Studied
Abstrakt (anglicky)
   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
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    13. 4. 2007
Datum importu
    8. 8. 2012