Fig. 1From: The influence of oxygen and methane on nitrogen fixation in subarctic Sphagnum mossesIncorporation of 15N–N2 (μmol g−1 DW day−1) in the mesotrophic fens (n = 2) and oligotrophic fens and bog (n = 3) Sphagnum mosses incubated with ambient O2 conditions (dark grey bars) or low O2 conditions (light grey bars), supplemented with 5% 15N–N2 (dark grey bars) or 5% 15N–N2 + 5% 13C–CH4 (light grey bars)Back to article page