Diffusive Fluxes of CH4 and CO2 at the Sediment-Overlying Water Interface in Reservoir Ecosystems
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Politechnika Rzeszowska
Renata Gruca-Rokosz   

Politechnika Rzeszowska, al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland
Publish date: 2018-09-01
J. Ecol. Eng. 2018; 19(5):158–164
The work detailed here has concerned CH4 and CO2 fluxes at the sediment-overlying water interface in Maziarnia and Nielisz Reservoirs, SE Poland. The research in question was conducted in the 2009-2011 period, samples of sediment and overlying water being collected at two stations located in the upper and lower parts of each Reservoir. Concentrations of CO2 and CH4 in pore water and overlying water were measured by the headspace method, using a Pye Unicam gas chromatograph (PU-4410/19) equipped with a methane analyzer allowing low CO2 concentrations to be detected. Diffusive fluxes of the analyzed gases at the sediment-overlying water interface were calculated on the basis of Fick's first law, and were found to range from -0.01 to 3.48 mmol m-2 d-1 for CH4 and from -1.27 to 47.02 mmol m-2 d-1 for CO2. Comparable fluxes elsewhere typify reservoirs experiencing far-reaching eutrophication. No dependent relationships were found between calculated values for fluxes and either season of the year or sediment characteristics.