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| Titel |
Thermal shock and splash effects on burned gypseous soils from the Ebro Basin (NE Spain) |
| VerfasserIn |
J. León, M. Seeger, D. Badía, P. Peters, M. T. Echeverría |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 1 ; Nr. 5, no. 1 (2014-03-12), S.131-140 |
| Datensatznummer |
250115259
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| Publikation (Nr.) |
 copernicus.org/se-5-131-2014.pdf |
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| Zusammenfassung |
| Fire is a natural factor of landscape evolution in Mediterranean ecosystems.
The middle Ebro Valley has extreme aridity, which results in a low plant cover
and high soil erodibility, especially on gypseous substrates. The aim of this
research is to analyze the effects of moderate heating on physical and
chemical soil properties, mineralogical composition and susceptibility to
splash erosion. Topsoil samples (15 cm depth) were taken in the Remolinos
mountain slopes (Ebro Valley, NE Spain) from two soil types: Leptic
Gypsisol (LP) in a convex slope and Haplic Gypsisol (GY) in a
concave slope. To assess the heating effects on the mineralogy we burned the
soils at 105 and 205 °C in an oven and to assess the splash effects
we used a rainfall simulator under laboratory conditions using undisturbed
topsoil subsamples (0–5 cm depth of Ah horizon). LP soil has lower soil
organic matter (SOM) and soil aggregate stability (SAS) and higher gypsum
content than GY soil. Gypsum and dolomite are the main minerals
(>80%) in the LP soil, while gypsum, dolomite, calcite and quartz
have similar proportions in GY soil. Clay minerals (kaolinite and illite) are
scarce in both soils. Heating at 105 °C has no effect on soil
mineralogy. However, heating to 205 °C transforms gypsum to
bassanite, increases significantly the soil salinity (EC) in both soil units (LP and GY) and
decreases pH only in GY soil. Despite differences in the content of organic
matter and structural stability, both soils show no significant differences
(P < 0.01) in the splash erosion rates. The size of pores is reduced by
heating, as derived from variations in soil water retention capacity. |
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