Figure 2: Total production of N2O from equations (1, 2, 3, 4, 5) and its 15N-labelling.
From: Nitrous oxide as a function of oxygen and archaeal gene abundance in the North Pacific
(a) All oxygen treatments, including any inhibitory effect of N2O (50 nmol N2O l−1 crossed with O2). (b) As this latter treatment had no effect, the data were pooled by their comparative oxygen concentrations (3+4 and 5+6; see Table 1). Each box in a and b shows the 25th and 75th percentile, overall spread in the data and median value (horizontal line). In both a and b, the effect of treatment is highly significant (P<0.0001). (c) Production of p45N2O is clearly above that expected (p45N2Oexp) from denitrification of NO2− (see the ‘Methods’ section) in each treatment and the symbol colours in c are the same as in b (grey=100% air; red=ambient; green=OFN and N2O; olive-green=O2 and N2O+O2). Drawn in SigmaPlot (Systat Software, San Jose, CA, USA).
