19 Jan 2023
 | 19 Jan 2023
Status: a revised version of 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 Znachor, Jiří Nedoma, Vojtech Kolar, and Anna Matoušů

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: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2023-4', Anonymous Referee #1, 10 Apr 2023
    • AC1: 'Reply on RC1', Anna Matousu, 22 May 2023
  • RC2: 'Comment on bg-2023-4', Anonymous Referee #2, 02 May 2023
    • AC2: 'Reply on RC2', Anna Matousu, 22 May 2023

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.