Influence of summer flood on the net ecosystem exchange of CO2 in a temperate sedge-grass marsh

0342873 - ÚVGZ 2011 RIV GB eng J - Journal Article
Dušek, Jiří - Čížková, Hana - Czerný, Radek - Taufarová, Klára - Šmídová, M. - Janouš, Dalibor
Influence of summer flood on the net ecosystem exchange of CO2 in a temperate sedge-grass marsh.
Agricultural and Forest Meteorology. Roč. 149, č. 9 (2009), s. 1524-1530. ISSN 0168-1923. E-ISSN 1873-2240
R&D Projects: GA MŽP(CZ) SP/2D1/93/07
Institutional research plan: CEZ:AV0Z60870520
Keywords : Wetland * Carbon * Water level * Eddy covariance * Carex acuta L.
Subject RIV: ED - Physiology
Impact factor: 3.197, year: 2009

Characteristics of CO2–C exchange were studied in a temperate herbaceous wetland in 2006 and 2007, years with contrasting hydrological regimes. Net ecosystem production (NEP) was calculated from the CO2 fluxes measured by the eddy-covariance technique and was compared with the seasonal course of plant live aboveground biomass. The results show that: (1) the annual net uptake of CO2–C was 199 and 220 g C m−1 yr−1 in 2006 and 2007, respectively. The daily net CO2–C uptake reached 12–20 g C m−2 day−1 in sunny summer days. (2) Although the observed wetland is adapted to floods, the summer flood substantially reduced its net CO2–C uptake. The daily courses of net CO2–C uptake point to reduced rates of CO2–C fixation by the vegetation cover. (3) A recovery growth of plant biomass was associated with a second peak of NEP in September 2006. (4) Lack of knowledge on the dynamics of methane emissions presently limits deeper understanding of the effect of floods on carbon balance in wetlands.
Permanent Link: http://hdl.handle.net/11104/0185486