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Fire is a natural factor of landscape evolution in Mediterranean ecosystems.The middle Ebro Valley has extreme aridity, which results in a low plant coverand high soil erodibility, especially on gypseous substrates. The aim of thisresearch is to analyze the effects of moderate heating on physical andchemical soil properties, mineralogical composition and susceptibility tosplash erosion. Topsoil samples (15 cm depth) were taken in the Remolinosmountain slopes (Ebro Valley, NE Spain) from two soil types:  LepticGypsisol  (LP) in a convex slope and  Haplic Gypsisol (GY) in aconcave slope. To assess the heating effects on the mineralogy we burned thesoils at 105 and 205 °C in an oven and to assess the splash effectswe used a rainfall simulator under laboratory conditions using undisturbedtopsoil subsamples (0–5 cm depth of Ah horizon). LP soil has lower soilorganic matter (SOM) and soil aggregate stability (SAS) and higher gypsumcontent than GY soil. Gypsum and dolomite are the main minerals(>80%) in the LP soil, while gypsum, dolomite, calcite and quartzhave similar proportions in GY soil. Clay minerals (kaolinite and illite) arescarce in both soils. Heating at 105 °C has no effect on soilmineralogy. However, heating to 205 °C transforms gypsum tobassanite, increases significantly the soil salinity (EC) in both soil units (LP and GY) anddecreases pH only in GY soil. Despite differences in the content of organicmatter and structural stability, both soils show no significant differences(P < 0.01) in the splash erosion rates. The size of pores is reduced byheating, as derived from variations in soil water retention capacity

Thermal shock and splash effects on burned gypseous soils from the Ebro Basin (NE Spain)