Fig. 2From: The influence of oxygen and methane on nitrogen fixation in subarctic Sphagnum mossesIncorporation of 13C–CH4 (μmol g−1 DW day−1) in Sphagnum mosses from mesotrophic fens and oligotrophic fens and bog sites, incubated with ambient O2 conditions (dark grey bars) or low O2 conditions (light grey bars)Back to article page