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Oxidación microbiana del carbono orgánico litosférico en suelos montañosos tropicales que se erosionan rápidamente
Jordon D Hemingway1,2, Robert G Hilton3, Niels Hovius4,5
1Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution (WHOI), 266 Woods Hole Road, Woods Hole, MA 02543, USA. jordon_hemingway@fas.harvard.edu.
Science (New York, N.Y.)
|April 14, 2018
Resumen
Oxidación del carbono orgánico petrogénico (OCpetro) en Taiwán
Área de la Ciencia:
- Geoquímica
- Geomorfología
- Biogeoquímica
Sus antecedentes:
- La oxidación del carbono orgánico litosférico (OCpetro) durante la erosión de las montañas libera CO2.
- Los mecanismos que controlan las tasas de oxidación de OCpetro en los paisajes son poco conocidos.
Objetivo del estudio:
- Cuantificar la oxidación de OCpetro y las emisiones de CO2 de la Cordillera Central de Taiwán.
- Investigar los controles de la remineralización de OCpetro en los suelos de montaña.
Principales métodos:
- Análisis de los biomarcadores de OC y lípidos a granel en los suelos.
- Medición del contenido de OCpetro y composición isotópica.
- Estimación de los flujos de emisión de CO2 sobre la base de las tasas de oxidación.
Principales resultados:
- Un promedio del 67% del OCpetro exhumado se oxida en los suelos.
- Las emisiones de CO2 oscilan entre 6,1 y 18,6 toneladas métricas C/km2/año.
- La actividad microbiana media en la remineralización de OCpetro.
Conclusiones:
- La rápida oxidación del petróleo en los suelos de montaña es una fuente importante de CO2 atmosférico.
- Las emisiones de CO2 aumentan con la tasa de erosión, contrarrestando el secuestro de carbono.
- La remineralización microbiana es el principal motor de la oxidación de OCpetro en estos sistemas.
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