Negligible
or no change. In the chemistry of nitrogen bacteria convert nitrogen
from the AIR, and hydrogen from cell into cell bound ammonia
N2 + 3 H2 -> 2 NH3
But where does that H2 come from? From metabolic reactions in the cell
that produce CO2 and H2O. The partial pressure from the gas CO2
molecule pretty much replaces the partial pressure of the N2, and any
real pressure difference would be made up of respiration of the H20 from
the cell into the air.
