Abstract
On the dunes of Doñana National Park (Spain) and in areas coinciding with a Juniperus turbinata evolved savin forest, the presence of Arenosoles with dark colours, presence of clays and levels enriched in iron and manganese at about 60 cm depth are detected. Its physicochemical and mineralogical characterization has been carried out following the usual methodology of our laboratory. These soils (profile SOJ-2) show a higher level of magnetic susceptibility, vermiculite biogenic clays and mild luvic and chromic properties in an B incipient horizon formation. All this denotes a greater pedogenesis that usually affects to the aeolian littoral sheet that characterizes to this important natural reserve. The phytostability that Juniperus turbinata offers would be the responsible for this pedogenesis, and the evolution experienced by the physicochemical parameters with the depth show an intense lateral washing of sand (sand washing). The different patterns of distribution of the medium sands along the profile could be used for the differentiation between different environmental conditions.
Highlights
The weathering processes and soil formation developed on the Litoral Aeolian Sand Sheet of Doñana (Huelva, Spain) (Borja et al, 2014) have been recently studied by Díaz del Olmo et al (2014) and Recio et al (2009, 2011) in situations related to the genesis and evolution of typical small-lake geoecosystems
The SOJ-2 soil profile appears as a powerful sandy soil, open up to about 300 cm. of depth (Table 1), and crowned by dark horizons brownish of 90 cm thick, with characteristics close to the isohumic soils of Duchaufour (1984)
Due of its physical-chemical characterization, it presents a morphology corresponding to the Arenosols group of FAO (2015), but with the presence of a horizon of accumulation of organic compounds rich in iron and manganese, protic iluvial characteristics, which makes it be classified as Arenosol chromic by FAO (2015)
Summary
The weathering processes and soil formation developed on the Litoral Aeolian Sand Sheet of Doñana (Huelva, Spain) (Borja et al, 2014) have been recently studied by Díaz del Olmo et al (2014) and Recio et al (2009, 2011) in situations related to the genesis and evolution of typical small-lake geoecosystems. In these works has been addressed at the same time the processes of translocation of particles that through this sand mass occur and named as «sand washing» (Recio et al, 2014). The purpose is to know how the pedogenesis is outlined on these same dune sands, how the lateral movement of silt and clay fractions are carried out in depth, as well as defining the general alterological processes that occur in this geomorphological situation
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