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Forecasting soil organic C resilience in volcanic ash soils assisted by automated interpretation of pyrolytic data

AuthorsHernández, Zulimar ; Almendros Martín, Gonzalo ; Hernández, S. A.
Issue Date19-May-2014
PublisherUniversity of Aston in Birmingham
Citation20th International Symposium on Analytical and Applied Pyrolysis (PYR2014) 19-23 May 2014. Birmingham, UK.
AbstractOne of the most interesting possibilities of analytical pyrolysis (Py/GC/MS) applied to soil organic matter (SOM) studies lies on identifying ¿pyrolytic markers¿ suitable to forecast ecosystems¿ functional descriptors at high organizational levels, such as SOM biodegradation, water retention, or erosion rates [1]. Concerning the resilience of SOM, it is not clear nowadays whether it depends on its molecular features or, conversely, on organo-mineral interactions, such could be the case of physical protection of non-decomposed SOM or organo-mineral complexes, e.g., those formed with nanoparticle-size allophanes [2]. Up to 200 pyrolytic compounds from humic acids (HA) were identified in volcanic ash soils from Tenerife, Canary Islands (Spain). Simultaneously, soil physico-chemical properties such as the amount of SOM and short-range minerals, total mineralization coefficient (TMC) or aggregate stability were determined. In order to explore the potential of partial least squares regression (PLS) in forecasting soil dependent variables exclusively using the information extracted from analytical pyrolysis, the data matrix consisting of total abundances of pyrolysis compounds was processed. Preliminary results showed that in these volcanic ash soils with large concentration of short-range minerals, the use of pyrolytic signature compounds led to explain a high number of soil emergent properties, e.g., SOM biodegradability, water holding capacity, P retention, or aggregate stability, which coincide with previous research [3], and suggested that formation of stable organomineral complexes and water saturation in nanoparticlesize micropores in thixotropic soils reduce the biodegradation of SOM. On the other hand, the most successful PLS models explaining the biodegradation rates of the SOM (e.g., TMC) using the pyrolytic data as independent variables, showed large importance for projection in the case of compounds corresponding to lignin-derived methoxyphenols and specific alkylbenzenes. [1] Tinoco P., Almendros G., González-Vila F.J. (2002). JAAP, 64, 407-420. [2] Hernández, Z., Almendros, G. (2012). Soil Biol. Biochem. 44, 130-142. [3] Hernández, Z., Almendros, G., Carral, P.,
DescriptionComunicación presentada en el 20th International Symposium on Analytical and Applied Pyrolysis (PYR2014) 19-23 May 2014. Birmingham, UK.
Appears in Collections:(MNCN) Comunicaciones congresos
(IRNAS) Comunicaciones congresos
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