Interactive comment on “Initial shifts in nitrogen impact on ecosystem carbon fluxes in an alpine meadow: patterns and causes” by Bing Song et al

This study addresses potential responses of different ecosystem C fluxes to gradual increases in N fertilization. The main findings of this study provide evidence that N saturation of ecosystem C fluxes can occur in a short period of time (just over 2 years since the start of the N fertilization experiment). Key findings are shown in Fig 2 where differences in NEE and ER are clear between years and along the N fertilization treatment.