Podrobnosti záznamu

Název
    Preservation of biomolecules in sub-fossil plants from raised peat bogs - a potential paleoenvironmental proxy. Part II. Biogeochemistry
Údaj o odpovědnosti
    Tomasz Kuder, Michael A. Kruge
Další názvy
    Advances in organic Geochemistry 1997 - Proceedings of the 18th International Meeting on Organic Geochemistry, Maastricht, the Netherlands 22-26 Spetember 1997 (Variant.)
Autor
    Kruge, Michael A.
    Kuder, Tomasz
Jazyk
    anglicky
Zdrojový dokument - seriál
    Organic geochemistry
Svazek/č.
    Vol. 29, no. 5-7
Strany
    p. 1355-1368
Rok
    1998
Poznámky
    6 obr., 1 fot., 2 tab., 2 s.bibl.
    Zkr. název ser.: Org. Geochem.
Předmětová skupina
    biodegradace
    holocén
    hydrologie
    národní park
    organická substance
    oxidace
    pyrolýza
    rašeliniště
    subrecent
    vegetace
Geografické jméno
    ČR-Čechy
    Krkonoše
    Polsko - jihozápad
    Rownia pod Sniezka (Polsko-jihozápad)
Klíčové slovo
    Biogeochemistry
    Biomolecules
    Bogs
    II
    Paleoenvironmental
    Peat
    Plants
    Potential
    Preservation
    Proxy
    Raised
    Sub-fossil
Abstrakt (anglicky)
   The relationship between changes of peat bog hydrology and the mechanism of decomposition suggests that the chemical modification of biopolymers of peat macrofossils might be used in paleoenvironmental reconstructions. A series of sedge (Eriophorum vaginatum) macrofossils from an Upper Holocene peat profile has been studied by analytical pyrolysis (Py-GC/MS). The major diaggenetic changes of biopolymers included loss of ester-bound ferulic and coumaric acids, an increase of oxidation (particularly due to C ketones) and shortening of alkyl side-chains, demethylation of methoxy groups of the lignin/polyphenol fraction, loss of pentosan polysaccharides and modification of cellulose (relative increase in the pyrolytic yield of anhydroglucose). The yield of oxidized methoxymoieties (particularly of C ketones) and shortening of alkyl side-chains of methoxyphenols were suggested as the best indicators of oxidative degradation.
   Statistically significant differences in chemical composition between samples from individual depth increments occur, in part in agreement with a sequence of wet and dry phases determined by paleobotanical analysis. The paleoenvironmental significance of the chemical record of degradation and relationship of paleohydrology reconstructed by the present technique and by means of botanical analysis is discussed. The former was proposed to respond primarily to the frequency of seasonal droughts
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    18. 2. 2008
Datum importu
    8. 8. 2012