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Título: | Analitical pirolysis of a podzolic soil sequence from Santa Catarina lirttoral (S. Brasil) |
Autor: | González-Pérez, José Antonio CSIC ORCID ; Boski, Tomasz; Knicker, Heike CSIC ORCID ; González-Vila, Francisco Javier CSIC ORCID ; Angulo, R.; Souza, María Cristina | Fecha de publicación: | 2012 | Citación: | 19th International Symposium on Analytical and Applied Pyrolysis | Resumen: | Piçarras (a vernacular term for podzols) occur along the South Eastern coastal zone of Brazil between Rio Grande do Sul and Rio de Janeiro States. These are formed by cementation of B soil horizons formed on sandy littoral sediments covered by the lush Atlantic forest. The cementing material is a mixture of sesquioxides (2-4%) and humic material with an elemental C content between 1 and 3%. It is assumed that the colonization of the accreted littoral bodies by vegetation occurred rapidly and contributed to the accumulation of humic material. Our study was done along a 2.5 km trench, perpendicular to the shore line in Volta Velha) in NE Santa Catarina State (26º04¿ S; 48º38¿ W), part of the Atlantic Forest Biosphere Reserve. The investigated trench profile is also roughly perpendicular to the front of prograding Holocene barriers. Samples (14) were collected and submitted to inorganic, and organic elemental analyses, GC/MS análisis of lipid fractions, analytical pyrolysis (Py-GC/MS) and 13C nuclear magnetic resonance (13C CP/MAS NMR). Age estimation of the progradational sequence was done by 14C-AMS of selected samples. Dating of the humic material proved the accretion model for the local costal barrier and opens new perspectives for the development of a new geochronological tool. Solid state 13C Nuclear magnetic resonance showed marked compositional differences between the organic matter spectra of different ages. The most spectacular seems to be the time dependent decrease in the carbohydrates, most probably mediated by bacterial respiration1. In order to confirm the noted alterations of the podzol¿s organic matter with age, in this communication we studied the thermal desorption and pyrolysis behaviour of a sequence of 14 podzol samples taken from the B horizon of soils representing the progradation front of the coastal barrier. | Descripción: | Trabajo presentado al citado Symposium, celebrado del 21-25 de mayo, de 2012, en Linz, Austria. | URI: | http://hdl.handle.net/10261/82041 |
Aparece en las colecciones: | (IRNAS) Comunicaciones congresos |
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