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Pyrogenic carbon in wildfire ash: characteristics and potential as C sink

Forest fires release substantial amounts of carbon (C). Much of this is emitted to the atmosphere, but some is deposited within an ash layer on the ground as pyrogenic C (PyC; also termed black carbon or biochar). PyC production is increasingly considered an important mechanism for C sequestration, but the current knowledge about its generation, mobilization and degradation is still limited. One area of limited knowledge is the quantity and characteristics of C deposited in ash from wildfires, which is crucial to understanding the fate of PyC in the environment and specifically its role as a C sink.