The whole-soil carbon flux in response to warming

• Autores: Caitlin Hicks Pries, C. Castanha
• Localización: Science, ISSN 0036-8075, Vol. 355, Nº 6332, 2017, págs. 1420-1423
• Idioma: inglés
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• Resumen

  • Soil organic carbon harbors three times as much carbon as Earth’s atmosphere, and its decomposition is a potentially large climate change feedback and major source of uncertainty in climate projections. The response of whole-soil profiles to warming has not been tested in situ. In a deep warming experiment in mineral soil, we found that CO2 production from all soil depths increased with 4°C warming; annual soil respiration increased by 34 to 37%. All depths responded to warming with similar temperature sensitivities, driven by decomposition of decadal-aged carbon. Whole-soil warming reveals a larger soil respiration response than many in situ experiments (most of which only warm the surface soil) and models.