Figure 1: Schematic of the carbon balance for a given terrestrial ecosystem. Circles and squares represent carbon stocks and fluxes, respectively. AG: aboveground, BG: below ground, SOC: soil organic carbon, Ra: autotrophic respiration, Rh: heterotrophic respiration, TER: total ecosystem respiration, GPP: gross primary production, NPP: net primary production, NEE: net ecosystem exchange, and NBP: net biome production.