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8000 yr of black carbon accumulation in a colluvial soil from NW Spain

Identificadores del recurso

Quaternary Research 69(1): 56–61 (2008)

0033-5894

http://hdl.handle.net/10261/78764

10.1016/j.yqres.2007.10.005

Procedência

(Instituto de Estudios Gallegos Padre Sarmiento)

Ficha

Título:: 8000 yr of black carbon accumulation in a colluvial soil from NW Spain
Tema:: Fire record; Black carbon; Pyrolysis-GC/MS
Descrição:: Analytical pyrolysis-GC/MS and solid-state 13C NMR (nuclear magnetic resonance) were applied to the NaOH-extractable organic matter fraction of a colluvial soil from Galicia (NW Spain) that represents more than 8500 yr of accumulation. While molecular indicators of vegetation change were looked for, it seemed likely that any such signal was disturbed by the intense fire regime of the area. This conclusion was drawn from (1) the presence of three charcoal layers, (2) the high proportion of aryl C in NMR spectra (non-quantitative) and (3) the prevalence of benzenes and polycyclic aromatic hydrocarbons (PAHs) in the chromatograms (38 ± 6% of total identified peak area), also in charcoal-poor samples. If this conclusion is accurate, the area has been subjected to burning episodes for at least 8000 yr. Additionally, the results indicate that biomass burning residues (black carbon; BC) may become NaOH extractable after long periods of degradation in mineral soil. These results add to our knowledge of the long-term fate of BC in soil, which is a potential agent in the global C cycle.; Project supported by the "Plan Nacional: Paleopaisaje y prehistoria del Futuro Parque de Arte Rupestre de Campo Lameiro, Pontevedra" (PGIDT02CCP60601).; Peer reviewed
Idioma:: English
Relação:: http://dx.doi.org/10.1016/j.yqres.2007.10.005
Autor/Produtor:: Kaal, Joeri; Martínez Cortizas, Antonio; Buurman, Peter; Criado-Boado, Felipe
Editor:: Elsevier
Direitos:: closedAccess
Data:: 2013-06-28T09:13:08Z; 2008-01
Tipo de recurso:: Artículo

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        < field name =" value " > Analytical pyrolysis-GC/MS and solid-state 13C NMR (nuclear magnetic resonance) were applied to the NaOH-extractable organic matter fraction of a colluvial soil from Galicia (NW Spain) that represents more than 8500 yr of accumulation. While molecular indicators of vegetation change were looked for, it seemed likely that any such signal was disturbed by the intense fire regime of the area. This conclusion was drawn from (1) the presence of three charcoal layers, (2) the high proportion of aryl C in NMR spectra (non-quantitative) and (3) the prevalence of benzenes and polycyclic aromatic hydrocarbons (PAHs) in the chromatograms (38 ± 6% of total identified peak area), also in charcoal-poor samples. If this conclusion is accurate, the area has been subjected to burning episodes for at least 8000 yr. Additionally, the results indicate that biomass burning residues (black carbon; BC) may become NaOH extractable after long periods of degradation in mineral soil. These results add to our knowledge of the long-term fate of BC in soil, which is a potential agent in the global C cycle. </ field >
        
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        < field name =" value " > Project supported by the "Plan Nacional: Paleopaisaje y prehistoria del Futuro Parque de Arte Rupestre de Campo Lameiro, Pontevedra" (PGIDT02CCP60601). </ field >
        
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