Fig. 3: Schematic of the model and biomass, nutrients, and rates at quasi-equilibrium states from model simulations with different organic matter (OM) and O2 supply rates. | Nature Communications

Fig. 3: Schematic of the model and biomass, nutrients, and rates at quasi-equilibrium states from model simulations with different organic matter (OM) and O2 supply rates.

From: Mechanistic understanding of nitrate reduction as the dominant production pathway of nitrous oxide in marine oxygen minimum zones

Fig. 3

a Schematic of the virtual chemostat model with diverse microbial types. b Changes of biomass along an increasing OM to O2 supply ratio. c Changes of percentages along an increasing OM to O2 supply ratio. Dashed red line indicates the percentage of \({{{{\rm{NO}}}}}_{3}^{-}\to {{{{\rm{N}}}}}_{2}{{{\rm{O}}}}\) contribution to the total N2O production rate (where \({{{{\rm{NH}}}}}_{4}^{+}\to {{{{\rm{N}}}}}_{2}{{{\rm{O}}}}\) contributes the remainder). Dashed gray line indicates the percentage of \({{{{\rm{NH}}}}}_{4}^{+}\to {{{{\rm{N}}}}}_{2}{{{\rm{O}}}}\) in total \({{{{\rm{N}}}}{{{\rm{H}}}}}_{4}^{+}\) oxidized by ammonia-oxidizing archaea. d Changes of nitrogen-cycling rates along an increasing OM to \({{{{\rm{NO}}}}}_{3}^{-}\) supply ratio. b–d share the same legend shown on the right of (d). AerHet stands for aerobic heterotrophs. In b and c, OM supply rate is 0.3 µM-N per day, O2 supply rate varies, and \({{{{\rm{NO}}}}}_{3}^{-}\) supply rate is at 1.2 µM per day. In (d), O2 supply rate is zero, \({{{{\rm{NO}}}}}_{3}^{-}\) supply rate is at 1.2 µM per day, and OM supply rate varies. e–g N2O concentrations, \({{{{\rm{NO}}}}}_{3}^{-}\to {{{{\rm{N}}}}}_{2}{{{\rm{O}}}}\) rates and \({{{{\rm{NH}}}}}_{4}^{+}\to {{{{\rm{N}}}}}_{2}{{{\rm{O}}}}\) rates with different O2 concentrations, respectively. e–g share the same color bar shown on the right of g, which indicates different OM supply rate in the units of µM-N per day.

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