Empirical estimates of regional carbon budgets imply reduced global soil heterotrophic respiration

Ciais, Philippe; Yao, Yitong; Gasser, Thomas; Baccini, Alessandro; Wang, Yilong; Lauerwald, Ronny; Peng, Shushi; Bastos, Ana; Li, Wei; Raymond, Peter A.; Canadell, Josep G.; Peters, Glen P.; Andres, Rob J.; Chang, Jinfeng; Yue, Chao; Dolman, A. Johannes; Haverd, Vanessa; Hartmann, Jens; Laruelle, Goulven; Konings, Alexandra G.; King, Anthony W.; Liu, Yi; Luyssaert, Sebastiaan; Maignan, Fabienne; Patra, Prabir K.; Peregon, Anna; Regnier, Pierre; Pongratz, Julia; Poulter, Benjamin; Shvidenko, Anatoly; Valentini, Riccardo; Wang, Rong; Broquet, Gregoire; Yin, Yi; Zscheischler, Jakob; Guenet, Bertrand; Goll, Daniel S.; Ballantyne, Ashley-P; Yang, Hui; Qiu, Chunjing und Zhu, Dan (2021): Empirical estimates of regional carbon budgets imply reduced global soil heterotrophic respiration. In: National Science Review, Bd. 8, Nr. 2, nwaa145

Abstract

Resolving regional carbon budgets is critical for informing land-based mitigation policy. For nine regions covering nearly the whole globe, we collected inventory estimates of carbon-stock changes complemented by satellite estimates of biomass changes where inventory data aremissing. The net land-atmospheric carbon exchange (NEE) was calculated by taking the sum of the carbon-stock change and lateral carbon fluxes from crop and wood trade, and riverine-carbon export to the ocean. Summing up NEE from all regions, we obtained a global 'bottom-up' NEE for net land anthropogenic CO2 uptake of -2.2 +/- 0.6 PgC yr(-1) consistent with the independent top-down NEE from the global atmospheric carbon budget during 2000-2009. This estimate is so far the most comprehensive global bottom-up carbon budget accounting, which set up an important milestone for global carbon-cycle studies. By decomposing NEE into component fluxes, we found that global soil heterotrophic respiration amounts to a source of CO2 of 39 PgC yr(-1) with an interquartile of 33-46 PgC yr(-1) -a much smaller portion of net primary productivity than previously reported.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Geowissenschaften > Department für Geographie > Physische Geographie und Landnutzungssysteme
• Themengebiete: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
• ISSN: 2095-5138
• Sprache: Englisch