On the black land, under the blue sky
by Antonio Jordán, University of Seville, Sevilla, Spain
First, in English:
The picture shows fallow vertisols in an experimental farm near Seville. Vertisols are soils locally common in large flat areas from southern Spain, characterized by the presence of smectites, swelling clays that contract during the dry season, which induces the appearance of visible cracks on the surface, and expand during the wet season, when water molecules enter the interlaminar space. Clay content is greater than 30%, and the soil surface has small mounds, forming a characteristic micro-relief known as "gilgai" (usually not observed if ploughed). Vertisols are known in Spain as "tierras negras" (black land).
Ahora, en español:
La imagen muestra un vertisol en barbecho en una granja experimental cerca de Sevilla. Los vertisoles son suelos comunes en áreas planas grandes del sur de España, caracterizados por la presencia de esmectitas, arcillas expansivas que se contraen durante la temporada seca, lo que induce la aparición de grietas visibles en la superficie, y se expanden durante la temporada húmeda, cuando las moléculas de agua entran en el espacio interlaminar. El contenido de arcilla es superior al 30%, y la superficie del suelo tiene pequeñas colinas, formando un micro-relieve característico conocido como "gilgai" (generalmente no observado si se ara). En España, los vertisoles son conocidos como "tierras negras".
Categories
Location
- Europe (3773)
- Southern Europe (1625)
- Spain (782)
- Exact location (-5.5941 W, 37.3971 N)
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Image properties
4608 × 2592 px;
image/jpeg; 1.6 MB
Camera:
Huawei HUAWEI MLA-L01
Taken on 25
March
2019
Submitted on 25 March 2019
Licence
Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
Credit
Antonio Jordán (distributed via imaggeo.egu.eu)
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