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

0363711 - ÚVGZ 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. E-ISSN 1726-4189
Grant CEP: GA MŠMT(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
http://arl-repository.lib.cas.cz/uloziste_av/UEK-B/cav_un_epca-0363711_01.pdf

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