Abstract. Peatlands' microtopography units -hummocks and hollows -are mainly differing by hydrological characteristics 10 (water table level, i.e. oxic-anoxic conditions) and vegetation communities. These factors affect the fluxes of key greenhouse gases (GHG) -methane (CH4) and carbon dioxide (CO2). However, the effects of microrelief forms on belowground CO2 and CH4 production and pathways of methanogenesis need deeper understanding. We hypothesized increasing CH4 and CO2 production potentials from naturally drier hummocks to more wet hollows during anaerobic incubation. GHG production in peat was expected to decrease with depth (decreasing inputs of recent plant-derived deposits) but the contribution of 15 hydrogenotrophic vs. acetoclastic pathway to the total methanogenesis should be higher in deeper peat layers as compared to upper layers. To test the hypotheses, we measured CH4 and CO2 productions together with the respective δ 13 C values under controlled anaerobic conditions with-and without addition of specific inhibitor of methanogenesis (2-bromo-ethane sulfonate, BES) in a peat soil of hummocks and hollows of five depths (15, 50, 100, 150 and 200 cm). The concentration of BES (1 mM) aimed to block acetoclastic but not the hydrogenotrophic pathway of methanogenesis.
20As expected, CH4 production was ca. 2 times higher in hollows than in hummocks, though no differences in CO2 were measured between the microforms. With depth, CO2 production rates decreased by 77% (15 cm vs. 200 cm) in both microforms, whereby the highest CH4 production was measured at 15 cm in hollows (91% of total produced CH4) and at 50 cm in hummocks (82%). Noteworthy, at 15 cm of hummocks less than 1% of total CH4 production was observed. Decreasing GHG production rates with depth positively correlated to an increase in the extractable total N and NH4 + concentrations. The
25hydrogenotrophic pathway of methanogenesis in deep vs. surface layers was depicted by lower (more negative) δ 13 C-CH4 and higher δ 13 C-CO2 values, respectively. Between the microforms, overall higher contribution of hydrogenotrophic vs.
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