This is a well-written and very interesting paper. I just have one suggestion/comment on the following sentence in the Discussion: "Cumulative rates of N2O fluxes were lower in summer because of generally dry conditions limiting nitrification" Did you mean to say "...limiting denitrification"?
I think that lower summer emissions are primarily driven by reduced denitrification due to lower soil WFPS levels, which you show are lower in summer vs winter. You have not measured changes in soil NH4 and NO3 so stating that differences in N2O emissions are due to soil water effects on nitrification is a bit speculative. On the other hand we know that low WFPS (high oxygen) will limit denitrification as denitrifiers are facultative anaerobes.  In fact, literature suggests that under dry conditions N2O derives mainly from nitrification, so it is still happening in dry conditions. 