Charred wood remaining after a wildfire as a reservoir of macro- and micronutrients in a Mediterranean pine forest

Author

Sara Marañón-Jiménez A B E , Jorge Castro A C , Emilia Fernández-Ondoño D and Regino Zamora A C

A Grupo de Ecología Terrestre, Departamento de Ecología, Facultad de Ciencias, Universidad de Granada, E-18071 Granada, Spain. 

B Department Hydrosystemmodellierung, Helmholtz-Zentrum für Umweltforschung GmbH – UFZ, D-04318 Leipzig, Germany. 

C Centro Andaluz del Medio Ambiente (CEAMA), Avenida Del Mediterráneo s/n, E-18006 Granada, Spain. 

D Departamento de Edafología y Química Agrícola, Facultad de Ciencias, Universidad de Granada, E-18071 Granada, Spain. 

E Corresponding author. Email: smaranon@ugr.es

International Journal of Wildland Fire 22(5) 681-695 http://dx.doi.org/10.1071/WF12030
Submitted: 22 February 2012  Accepted: 19 November 2012   Published: 18 March 2013 

Abstract

Large amounts of logs and coarse woody debris remain in the ecosystem after wildfires. However, the relevance of the nutrient reservoir contained in the remaining post-fire woody debris for the ecosystem nutrient reserves is rarely considered. In this paper, we determine the carbon and nutrient concentrations in the partially charred wood after a wildfire along an altitudinal gradient and assess the relative magnitude of the nutrient reservoir in the wood in relation to those existing in the first 10-cm soil layer. Soils were poorly developed and nutrients limiting for the vegetation requirements. Charred woody material still contained a relatively high concentration of nutrients compared to those reported for unburnt pine wood, and in general, this decreased with altitude. Partially charred wood represented a considerable pool of nutrients, due to both the relatively high concentrations and to the great amount of biomass still present after the fire. Potential contributions of the charred wood were particularly relevant for N and micronutrients Na, Mn, Fe, Zn and Cu, as wood contained 2–9 times more nutrients than the soil. Post-fire woody debris constitutes therefore a valuable natural element as a potential source of nutrients, which would be lost from ecosystems in cases where it is removed.

Additional keywords: forest management, Mediterranean mountain, post-fire salvage logging, silvicultural treatments, soil nutrients, wood nutrients, woody debris.

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