Typic Haplaquoll from Santa Olalla Lagoon (Doñana National Park, southwestern Spain)
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Typic Haplaquoll from Santa Olalla Lagoon (Doñana National Park, southwestern Spain)

by Antonio Jordán, University of Seville, Sevilla, Spain

The soil bordering the Santa Olalla Lagoon develops from aeolian sands and has a mollic A horizon 50 centimeters thick, with a high content of organic matter (about 9-10%). Soil texture is sandy loam (surface) to sandy (in depth) and soil pH varies between ~5 at the surface and ~8 at 150 cm deep.