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La végétation des sols polygonaux aux étages alpin supérieur et subnival en Valais (Alpes centro-occidentales, Suisse)

Béguin, Claude ; Progin Sonney, Mélanie ; Vonlanthen, Michel

In: Botanica Helvetica, 2006, vol. 116, p. 41-54

Polygonal soils are typical formations of arctic regions but occur locally at high elevation in the Alps. A vegetation survey of sites with polygonal patterning of soils in the Western Swiss Alps revealed a clear distinction between (1) periglacial polygonal soils, whose structure is created by frost action, and whose occurrence is limited to the subniveal belt (2700–3000 m a.s.l.) and (2)...