Podrobnosti záznamu

Název
    Nitrogen, organic carbon and sulphur cycling in terrestrial ecosystems: Linking nitrogen saturation to carbon limitation of soil microbial processes
Autor
    Cosby, Bernard J.
    Evans, Christopher
    Hruška, Jakub
    Kopáček, Jiří
    Moldan, Filip
    Oulehle, Filip
    Šantrůčková, Hana
    Tahovská, Karolína
    Wright, Richard
Jazyk
    anglicky
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Biogeochemistry
Svazek/č.
    Roč. 115, č. 1-3
Strany
    19
Rok
    2013
Výraz tezauru
    Nitrogen, carbon, sulphur, acidification, forest, modelling
Klíčové slovo
    Carbon
    Cycling
    Ecosystems
    Limitation
    Linking
    Microbial
    Nitrogen
    Organic
    Processes
    Saturation
    Soil
    Sulphur
    Terrestrial
Abstrakt (anglicky)
   Elevated and chronic nitrogen (N) deposition to N-limited terrestrial ecosystems can lead to nitrogen saturation, with resultant ecosystem damage and leaching of nitrate (NO3-) to surface waters. Present-day N deposition, however, is often a poor predictor of NO3- leaching, and the pathway of the ecosystem transition from N-limited to N-saturated remains incompletely understood. The dynamics of N cycling are intimately linked to the associated carbon (C) and sulphur (S) cycles. We hypothesize that N saturation is associated with shifts in the microbial community, manifest by a decrease in the fungi-to-bacteria ratio and a transition from N to C limitation. Three mechanisms could lead to lower availability of bioavailable dissolved organic C (DOC) to the microbial community and to C limitation of N-rich systems: (1) Increased abundance of N for plant uptake, causing lower bioavailable C allocation to plant roots; (2) chemical suppression of DOC solubility and bioavailability by soil aci
   dification; and (3) enhanced mineralisation of bioavailable DOC due to increased abundance of electron acceptors in the form of SO42- and NO3- in anoxic soil micro-sites. Here we consider each of these mechanisms, the extent to which their hypothesised impacts are consistent with observations from intensively-monitored sites, and the potential to improve biogeochemical models by incorporating mechanistic links to the C and S cycles.
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (RIV)
Zdrojový formát
    R
Datum importu
    15. 10. 2014