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Fire effects on soil organic carbon content and stability in calcareous and gypseous soils

AutorMora, J.L.; Badía-Villas, D.; Martí Dalmau, C.; Girona García, Antonio; Aznar, Javier M.; González-Pérez, José Antonio ; Knicker, Heike
Fecha de publicación14-jul-2015
EditorUniversity College Dublin
Citación5th International Conference of Fire Effects on Soil Properties (FESP5) Poster:24B (2015)
ResumenFires largely affect soil organic carbon (SOC), resulting both in loss of organic matter and the genesis of pyromorphic forms that are generally considered to be highly resistant to degradation. Calcium is known to contribute to SOC stabilisation, so SOC is more protected and fire effects might be less pronounced for soils developed from Ca-bearing materials (e.g., limestone, gypsum) than in other soils. In this work, we investigated the effect of fire on SOC stability in soils developed from calcareous and gypseous bedrocks. Twelve monoliths (15 x 25 x 5 cm) were collected from the top of soils with calcareous mollic (Rendzic Phaeozem, PHrz) or gypseous ochric (Haplic Gypsisol, GYha) horizons in a semiarid pinewood forest in Northeast Spain. In a laboratory designed experiment six blocks were heated from the surface until 250 °C was reached at 1 cm depth, and other six monoliths were preserved as control samples. The O layer and first and second cm from Ah horizon were scrapped from the surface of the monoliths and analysed separately. Total SOC content was obtained by dry combustion. To assess the content and mean residence time (MRTs) of labile and stable SOC pools, the samples were incubated during 100 days at 25 ºC in a Respicond IV apparatus. Respiration data were acquired continuously and fitted to a double-exponential decay model. The results are analysed in relation to the thermal treatment, soil type and depth using ANOVA for repeated measures. Thermal treatment had contrasting effects on the GYha and PHrz. At the GYha, burning decreased the contents and MRTs of both labile and stable SOC, but the effects were larger on the stable SOC, pointing to a conversion of stable SOC into forms more prone to degradation. For the PHrz, burning decreased the labile SOC contents while increased its MRT, but did not affect the amount of stable SOC, which indeed tended to increase, suggesting the formation of stable SOC due to fire at expenses of the more labile forms.
Aparece en las colecciones: (IRNAS) Comunicaciones congresos
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