International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

Reduction of nutrient losses with eroded sediments by post-fire soil stabilisation techniques

M. X. Gómez-Rey A C , A. Couto-Vázquez A , S. García-Marco A , J. A. Vega B and S. J. González-Prieto A
+ Author Affiliations
- Author Affiliations

A Instituto de Investigaciones Agrobiológicas de Galicia (CSIC), Apartado 122, E-15780 Santiago de Compostela, Spain.

B Centro de Investigación Forestal de Lourizán, Consellería de Medio Rural e do Mar, Apartado 127, E-36080 Pontevedra, Spain.

C Corresponding author. Email: mxgomez@iiag.csic.es

International Journal of Wildland Fire 22(5) 696-706 https://doi.org/10.1071/WF12079
Submitted: 21 May 2012  Accepted: 13 November 2012   Published: 15 February 2013

Abstract

After an experimental fire in steep shrubland in a temperate–humid region (north-west Spain), the effects of two post-fire stabilisation treatments (grass seeding and straw mulching) on the chemical properties of eroded sediments, and the amount of nutrients lost with them, were evaluated relative to control burnt soil, over a period of 13 months. Total C and N concentrations, and δ13C, indicated that sediments were mainly contributed by charred plant and litter material. The highest concentrations of extractable base cations in the sediments occurred during the first 3 months following fire, especially for Na and K. As treatments had little or no effect on nutrient concentration in sediments, differences in nutrient losses were due to the 10-fold lower sediment production in mulching compared with other treatments. In control and seeding treatments, the accumulated amounts of nutrients lost with sediments were 989–1028 kg ha–1 (C), 77 kg ha–1 (N), 1.9–2.4 kg ha–1 (Ca), 0.9–1.1 kg ha–1 (Mg), 0.48–0.55 kg ha–1 (NH4+–N), 0.39–0.56 kg ha–1 (K), 0.19–0.34 kg ha–1 (Na) and <0.1 kg ha–1 (P and NO3–N). These values accounted for 22–25% (total C and N) and 5–12% (NH4+–N, Ca, P and Mg) of available nutrients in ash, and 1.0–2.4% of those in ash+topsoil. As nutrient and sediment losses were strongly correlated, the reduction of the latter by mulching application leads to an effective decrease of post-fire nutrient losses.

Additional keywords: burnt area emergency response, δ13C, δ15N, experimental fire, mulching, seeding, shrubland.


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