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Monitoring wildfire induced alteration in soil organic matter of Mediterranean eucalypt stands

AutorFaria, Silvia Regina; Rosa Arranz, José M. de la ; González-Pérez, José Antonio ; Jiménez Morillo, N. T. ; Keizer, Jan Jacob
Fecha de publicación8-may-2014
EditorUniversidad de Barcelona
CitaciónV Reunión Internacional FuegoRED 2014, Barcelona - Solsona, 8-10 Mayo 2014
ResumenWildfire may cause significant changes in the quality and quantity of soil organic matter (SOM). These changes may negatively affect soil health and quality, and induce or enhance runoff generation and, thereby, the loss of soil. This study focuses on the study of markers of fire effects on SOM in topsoil samples (0-2cm) from burnt (EB) and unburnt soil (EU), in a Cambisol under Eucalyptus plantation from central Portugal lipid composition of SOM and some biogeochemical markers of fire. They were collected in 6–monthly intervals, starting immediately after a wildfire in August 2010 during 24 months. Elemental analyses indicated that fire induced losses of TOC and increase of TN in EB, concomitantly C/N ratio was reduced. Analysis of the total lipid extract pointed out that the wildfire caused notable qualitative changes on the SOM. Fire caused the thermal breakdown and cracking of nalkanes and n-FAMEs. In particular, the ratio of short-to-long of n-alkanes and n-FAME’S was increased, and the typical odd-to-even and even-to-odd predominance typical for alkanes and FAMES respectively was lost in EB soils. Additionally, the relative abundance of markers of specific vegetation was altered due to fire. Terpenoids such as epiglobulol, ledol, globulol and 1.8 eucalyptol, characteristic of Eucalyptus globullus, decreased more than 30% in EB samples. In contrast, Levoglucosan, a typical marker of thermal alteration was found in EB. In addition, burnt soils showed greater abundance of lignin compounds (Vanillin and several methoxyphenols), a relative enrichment in aromatic compounds and accumulation of recalcitrant aromatic Nstructures (indicators of black nitrogen). They confirmed the thermal decomposition of OM during the fire. The quantitative and qualitative differences identified for the typical markers of vegetation between both soils were maintained during the 24 months after fire. These results pointed out that the EB soil is not being recovered to the pre-fire conditions, neither at a molecular level nor in the elemental composition. Those results recommend carrying out an active management to avoid future alterations in the SOM composition and OC losses.
DescripciónComunicacion presentada en la V Reunión Internacional FuegoRED 2014, Barcelona - Solsona, 8-10 Mayo 2014. FUEGORED2014- p.16
Versión del editorhttp://www.paucostafoundation.org/single_projectes.php?id=12&categoria=IDi
Aparece en las colecciones: (IRNAS) Comunicaciones congresos
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