Gómez Rey, M.X. and Couto Vázquez, A. and García Marco, Sonia and Vega, J. A. and González Prieto, S.J.
Reduction of Nutrient Losses with Eroded Sediments by Post-Fire Soil Stabilisation Techniques.
"International Journal of Wildland Fire", v. 22
After an experimental fire in steep shrub land 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, we reevaluated relative to control burnt soil, over a period of 13 months. Total C
and N concentrations, and
C, 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 989–1028kgha
(P and NO
These values accounted for 22–25% (total C and N) and 5–12% (NH
–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.