Impact of burn severity on soil properties in a Pinus pinaster ecosystem immediately after fire
Víctor Fernández-García
A C , Elena Marcos A , José Manuel Fernández-Guisuraga A , Angela Taboada A B , Susana Suárez-Seoane A and Leonor Calvo A
+ Author Affiliations
- Author Affiliations
A Ecology, Department of Biodiversity and Environmental Management, Faculty of Biological and Environmental Sciences, Universidad de León, 24071 León, Spain.
B Institute of Environmental Research, Universidad de Léon, 24071 León, Spain.
C Corresponding author. Email: vferg@unileon.es
International Journal of Wildland Fire 28(5) 354-364 https://doi.org/10.1071/WF18103
Submitted: 10 July 2018 Accepted: 21 December 2018 Published: 22 March 2019
Abstract
We analyse the effects of burn severity on individual soil properties and soil quotients in Mediterranean fire-prone pine forests immediately after a wildfire. Burn severity was measured in the field through the substrate stratum of the Composite Burn Index and soil samples were taken 7–9 days after a wildfire occurred in a Pinus pinaster Ait. ecosystem. In each soil sample, we analysed physical (size of soil aggregates), chemical (pH, organic C, total N and available P) and biological (microbial biomass C, β-glucosidase, urease and acid phosphatase activities) properties. Size of aggregates decreased in the areas affected by high burn severity. Additionally, moderate and high severities were associated with increases in pH and available P concentration and with decreases in organic C concentration. Microbial biomass C showed similar patterns to organic C along the burn severity gradient. The enzymatic activities of phosphatase and β-glucosidase showed the highest sensitivity to burn severity, as they strongly decreased from the low-severity scenarios. Among the studied soil quotients, the C : N ratio, microbial quotient and β-glucosidase : microbial biomass C quotient decreased with burn severity. This work provides valuable information on the impact of burn severity on the functioning of sandy siliceous soils in fire-prone pine ecosystems.
Additional keywords: biological properties, chemical properties, maritime pine, physical properties, wildfire.
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