Podrobnosti záznamu

Název
    Calcium isotope constraints on the uptake and sources of Ca2+ in a base-poor forest: A new concept of combining stable (d44/42Ca) and radiogenic (eCa) signals
Autor
    Dejeant, Adrien
    Farkaš, Juraj
    Jacobsen, Stein
    Novák, Martin
Jazyk
    anglicky
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Geochimica et Cosmochimica Acta
Svazek/č.
    Roč. 75, č. 22
Strany
    16
Rok
    2011
Výraz tezauru
    calcium isotopes base-poor forest
Klíčové slovo
    Base-poor
    Ca2+
    Calcium
    Combining
    Concept
    Constraints
    D44/42Ca
    ECa
    Forest
    Isotope
    New
    Radiogenic
    Signals
    Sources
    Stable
    Uptake
Abstrakt (anglicky)
   This study shows that in a base-poor forest of the northeastern USA the 'exchangeable Ca pool' of deeper mineral soils is significantly enriched in radiogenic 40Ca, due to the dissolution of K-rich silicate minerals. Using a simple isotope mass balance model our results indicate that the weathering of biotite may supply a sizeable fraction, up to 25%, of Ca into the 'exchangeable pool' of deeper mineral soils. We also found no evidence of radiogenic 40Ca in the samples of forest floor and the uppermost organic-rich soils, which in turn suggest that over the long-term development of the forest, the vegetation growth must relied primarily on the non-radiogenic Ca sources, such as (i) atmospheric deposition, (ii) organically-complexed Ca, and (iii) chemical weathering and/or fungal mediated dissolution of apatite. Hence, our Ca isotope data indicate that the base-poor forest is able to bypass the 'exchangeable pool' of deeper mineral soils, and still manages to meet its nutritional Ca req
   uirements.
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (RIV)
Zdrojový formát
    R
Datum importu
    15. 10. 2014