File:RGA sol argilo limoneuxPolyedergefüge zoom2.jpg

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A blocky structure developes abiotically due to periodic swelling and shrinking in loamy, silty and clayey soils. It is characterized most evidently by sharp edges

Summary

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Description
Français : Une structure polyédrique se forme, de manière abiotique (sans intervention du vivant), par la simple dynamique de retrait-gonflement des sols superficiels argilo-limoneux riches en argile. Le caractère d'identification la plus remarquable est la formation de bords de cassure net et tranchants quand le matériaux se rétracte en séchant.
Ce type de sol est relativement imperméable et favorise une lente circulation horizontale de l'eau, surtout s'il est riche en argile et tant qu'il est gorgé d'eau. En cas de dessication, il devient alors momentanément percolant ; les racines de plantes peuvent alors s'y infiltrer, et ensuite durablement permettre une circulation verticale de l'eau, au détriment de la zone humide superficielle s'il elle existait en surface (en fonction du relief (géomorphologie) et de la pluviométrie
English: A polyhedral structure is formed, abiotically (without intervention by living organisms), by the simple dynamics of retraction-swelling of clay-silt surface soils rich in clay. The most remarkable identifying characteristic is the formation of clean, sharp break edges when the material shrinks as it dries.
This type of soil is relatively impermeable and promotes slow horizontal circulation of water, especially if it is rich in clay and so full of water. In the event of desiccation, it then becomes momentarily percolating; plant roots can then infiltrate there, and then sustainably allow vertical circulation of water, to the detriment of the superficial wet zone if it existed on the surface (in function of relief (geomorphologie) and pluviometry
Date
Source File:Polyedergefüge.JPG#%7B%7Bint%3Afiledesc%7D%7D
Author Volker.haering

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