19 Jan 2023
19 Jan 2023
Status: this preprint is currently under review for the journal BG.

Spatial and temporal variability of methane emissions and environmental conditions in a hyper-eutrophic fishpond

Petr Znachor1,2, Jiří Nedoma1, Vojtech Kolar1,3, and Anna Matoušů1 Petr Znachor et al.
  • 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.

Petr Znachor et al.

Status: open (until 02 Mar 2023)

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Petr Znachor et al.

Data sets

Dehtar 2019 data set Znachor et al.

Petr Znachor et al.


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Short summary
We conducted intensive spatial sampling of the hypertrophic fishpond to better understand the spatial dynamics of methane fluxes and environmental heterogeneity in fishponds. The diffusive fluxes of methane accounted for only a minor fraction of the total fluxes, and both varied pronouncedly within the pond and over the studied summer season, which could be explained only by the water depth. Wind substantially affected temperature, oxygen and chlorophyll-a distribution in the pond.