Ítem
Acceso Abierto
Soil carbon storage capacity of drylands under altered fire regimes
Título de la revista
Autores
Pellegrini, A. F
Reich, P. B.
Hobbie, S. E.
Coetsee, C.
Wigley, B.
February, E
Hantson, Stijn Erik R.
Fecha
2023-10-01
Directores
ISSN de la revista
Título del volumen
Editor
Universidad del Rosario
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Métricas alternativas
Resumen
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.
Abstract
Palabras clave
soil organic carbon (SOC) , Ecosystem models
