Spatial and temporal variability of methane emissions and environmental conditions in a hyper-eutrophic fishpond
- 1Biology Centre of Czech Academy of Sciences, v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice, 37005, Czech Republic
- 2Faculty of Science, University of South Bohemia, Branišovská 1760, České Budějovice, 37005, Czech Republic
- 3Biology Centre of Czech Academy of Sciences, Institute of Entomology, Branišovská 31, České Budějovice, 370 05, Czech Republic
- 1Biology Centre of Czech Academy of Sciences, v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice, 37005, Czech Republic
- 2Faculty of Science, University of South Bohemia, Branišovská 1760, České Budějovice, 37005, Czech Republic
- 3Biology Centre of Czech Academy of Sciences, Institute of Entomology, Branišovská 31, České Budějovice, 370 05, Czech Republic
Abstract. Estimations of methane (CH4) emissions are often based on point measurements using either flux chambers or a transfer coefficient method which may lead to strong underestimation of the total CH4 fluxes. In order to demonstrate more precise measurements of the CH4 fluxes from an aquaculture pond, using higher resolution sampling approach we examined the spatiotemporal variability of CH4 concentration in the water, related fluxes (diffusive and ebullitive) and relevant environmental conditions (temperature, oxygen, chlorophyll-a) during three diurnal campaigns in a hyper-eutrophic fishpond. Our data show remarkable variance spanning several orders of magnitude while diffusive fluxes accounted for only a minor fraction of total CH4 fluxes (4.1–18.5 %). Linear mixed-effects models identified water depth as the only significant predictor of CH4 fluxes. Our findings necessitate complex sampling strategies involving temporal and spatial variability for reliable estimates of the role of fishponds in a global methane budget.
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Petr Znachor et al.
Status: open (until 02 Mar 2023)
Petr Znachor et al.
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Dehtar 2019 data set Znachor et al. https://zenodo.org/badge/latestdoi/587640213
Petr Znachor et al.
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