Soil carbon storage capacity of drylands under altered fire regimes

Adam F.A. Pellegrini, Peter B. Reich, Sarah E. Hobbie, Corli Coetsee, Benjamin Wigley, Edmund February, Katerina Georgiou, Cesar Terrer, E. N.J. Brookshire, Anders Ahlström, Lars Nieradzik, Stephen Sitch, Joe R. Melton, Matthew Forrest, Fang Li, Stijn Hantson, Chantelle Burton, Chao Yue, Philippe Ciais, Robert B. Jackson

Research output: Contribution to journalResearch Articlepeer-review

2 Scopus citations

Abstract

The determinants of fire-driven changes in soil organic carbon (SOC) across broad environmental gradients remains unclear, especially in global drylands. Here we combined datasets and field sampling of fire-manipulation experiments to evaluate where and why fire changes SOC and compared our statistical model to simulations from ecosystem models. Drier ecosystems experienced larger relative changes in SOC than humid ecosystems—in some cases exceeding losses from plant biomass pools—primarily explained by high fire-driven declines in tree biomass inputs in dry ecosystems. Many ecosystem models underestimated the SOC changes in drier ecosystems. Upscaling our statistical model predicted that soils in savannah–grassland regions may have gained 0.64 PgC due to net-declines in burned area over the past approximately two decades. Consequently, ongoing declines in fire frequencies have probably created an extensive carbon sink in the soils of global drylands that may have been underestimated by ecosystem models.

Original languageEnglish (US)
Pages (from-to)1089-1094
Number of pages6
JournalNature Climate Change
Volume13
Issue number10
DOIs
StatePublished - Oct 2023

All Science Journal Classification (ASJC) codes

  • Environmental Science (miscellaneous)
  • Social Sciences (miscellaneous)

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