Počet záznamů: 1

Carbon fluxes of surfaces vs. ecosystems. Advantages of measuring eddy covariance and soil respiration simultaneously in dry grassland ecosystems

  1. 1.
    0363711 - UEK-B 2012 RIV DE eng J - Článek v odborném periodiku
    Nagy, Z. - Pintér, K. - Pavelka, Marian - Dařenová, Eva - Balogh, J.
    Carbon fluxes of surfaces vs. ecosystems. Advantages of measuring eddy covariance and soil respiration simultaneously in dry grassland ecosystems.
    Biogeosciences. Roč. 8, č. 9 (2011), s. 2523-2534 ISSN 1726-4170
    Grant CEP: GA MŠk(CZ) ED1.1.00/02.0073
    Výzkumný záměr: CEZ:AV0Z60870520
    Klíčová slova: carbon fluxes * ecosystems * grassland ecoystems * measuring eddy covariance * soil respiration
    Kód oboru RIV: EH - Ekologie - společenstva
    Impakt faktor: 3.859, rok: 2011

    An automated open system for measurement of soil CO2 efflux (Rsc) was developed and calibrated against known fluxes. The system was tested in the field, while estimating soil respiration simultaneously by the gradient method (Rsg) at a dry, sandy grassland site (Bugac, Hungary). Ecosystem respiration (Rego) was measured using the eddy covariance technique. The small chamber size (5 cm in diameter) made it possible to use the chambers in vegetation gaps. The correlation between ecosystem and soil CO2 efflux rates as measured by the independent methods was significant. The gradient method showed both up and downward CO2 fluxes originating from the main rooting zone after rains. Downward fluxes within the soil profile amounted to 15 % of the simultaneous upward fluxes and to ~7.6 % of the total (upward) effluxes during the 3-month study. The upper 5 cm soil layer contributed to ~50 % of the total soil CO2 efflux.
    Trvalý link: http://hdl.handle.net/11104/0199414