Impact of fire and post-fire management techniques on soil chemical properties.
2013
Gómez Rey, María Xesús | Couto-Vázquez, A. | García Marco, Sonia | González Prieto, Serafín Jesús
The effects of fire (Control burned soil) and two emergency stabilisation techniques (grass Seeding and straw Mulching) on 20 chemical characteristics were evaluated on 0-5 cm top-soils sampled 1, 90, 180 and 365 days after an experimental fire in a steep shrubland of a temperate-humid region (NW Spain). Most part of pH (in H2O and KCl) variance was explained by the sampling date. No clear temporal trends were identifiable for total soil C and N content, likely due to the large SOM pool in these soils; however, changes on soil δ 13C were explained by the deposition of 13C-depleted ashes, followed by its progressive erosion, while those on soil δ 15N were a consequence of fire induced N outputs. After the fire, NH4 +-N, P, Na, K, Mg, Ca, Mn, Cu, Zn and B concentrations increased, while those of NO3 --N, Al, Fe and Co did not vary significantly. Despite a significant decline with time, concentrations of Mg, Ca and Mn at the end of the study were still higher than in unburned soil, while those of K, Cu, Zn and B were similar to the pre-fire levels and those of NH4 +-N, P and Na were below pre-fire values. Mulching and Seeding treatments for burned soil emergency stabilisation had significant effects on soil δ 15N and extractable K, Mg and Ca, while data were inconclusive for their possible effects on the extractable Al, Fe and Co.
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