Publication

CYCLES DE VIE DES SOLS DE L’OUEST LAUSANNOIS. Facteurs et acteurs de l’anthropopédogénèse

2018
Posters

Abstract

Le projet de doctorat « Our Common Soils : L’écosystème des sols infrastructurels dans la ville-territoire alpino-lémanique » envisage de nouvelles formes de (co)habitabilité des aires métropolitaines contemporaines au regard de l’évolution des sols fortement transformés par l’homme, notamment autour de l’aménagement des infrastructures dans le district post-industriel de l’Ouest lausannois.

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2018
Posters

Abstract

Official source

Related concepts (8)

Soil

Soil, also commonly referred to as earth, is a mixture of organic matter, minerals, gases, liquids, and organisms that together support life of plants and soil organisms. Some scientific definitions distinguish dirt from soil by restricting the former term specifically to displaced soil. Soil consists of a solid phase of minerals and organic matter (the soil matrix), as well as a porous phase that holds gases (the soil atmosphere) and water (the soil solution). Accordingly, soil is a three-state system of solids, liquids, and gases.

Soil pH

Soil pH is a measure of the acidity or basicity (alkalinity) of a soil. Soil pH is a key characteristic that can be used to make informative analysis both qualitative and quantitatively regarding soil characteristics. pH is defined as the negative logarithm (base 10) of the activity of hydronium ions (H+ or, more precisely, H3O+aq) in a solution. In soils, it is measured in a slurry of soil mixed with water (or a salt solution, such as 0.01M CaCl2), and normally falls between 3 and 10, with 7 being neutral.

Alkali soil

Alkali, or Alkaline, soils are clay soils with high pH (greater than 8.5), a poor soil structure and a low infiltration capacity. Often they have a hard calcareous layer at 0.5 to 1 metre depth. Alkali soils owe their unfavorable physico-chemical properties mainly to the dominating presence of sodium carbonate, which causes the soil to swell and difficult to clarify/settle. They derive their name from the alkali metal group of elements, to which sodium belongs, and which can induce basicity.

Related publications (1)

CYCLES DE VIE DES SOLS DE L’OUEST LAUSANNOIS. Facteurs et acteurs de l’anthropopédogénèse

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