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URN: urn:nbn:de:swb:90-458126
DOI: 10.5194/bgd-11-15149-2014

Pyrogenic carbon from tropical savanna burning: production and stable isotope composition

Saiz, G.; Wynn, J. G.; Wurster, C. M.; Goodrick, I.; Nelson, P. N.; Bird, M. I.

Widespread burning of mixed tree-grass ecosystems represents the major natural locus of pyrogenic carbon (PyC) production. PyC is a significant, pervasive, and yet poorly understood "slow-cycling" form of carbon present in the atmosphere, hydrosphere, soils and sediments. We conducted sixteen experimental burns on a rainfall transect in northern Australian savannas with C4 grasses ranging from 35 to 99% of total biomass. Residues from each fire were partitioned into PyC and further into recalcitrant (HyPyC) components, with each of these also partitioned into proximal (> 125 µm) and distal (< 125 µm) fluxes. The median [range] PyC production across all burns was 16.0 [11.5]% of total carbon exposed (TCE), with HyPyC accounting for 2.5 [4.9]% of TCE. Both PyC and HyPyC were dominantly partitioned into the proximal flux, likely to remain (initially) close to the site of production. Production of HyPyC was strongly related to fire residence time, with shorter duration fires resulting in higher HyPyC yields. The carbon isotope (&#948;13C) compositions of PyC and HyPyC were generally lower by 1-3‰ relative to the orig ... mehr

Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 1810-6277, 1810-6285
KITopen ID: 1000045812
HGF-Programm 12.02.01; LK 01
Erschienen in Biogeosciences discussions
Band 11
Heft 10
Seiten 15149-15183
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
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