cryoturbation


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cryoturbation

[¦krī·ō·tər′bā·shən]
(geology)
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The first vegetation type is characterized by stripped communities here ascribed to the alliance Festucion burnatii, representing xerophilous mountain communities subjected to cryoturbation processes previously described in the highest altitudinal belt of the Picos de Europa (RIVAS-MARTINEZ & al., 1984, Nava, 1988; Jimenez-Alfaro & al., 2014b).
Possibly, a later cryoturbation, a result of permafrost soils fitting into the environment and climatic situation of that time, was responsible for secondary overprint of the primary sediment structures.
* Orthels show little or no evidence of cryoturbation. In addition to mosses, sedges, and shrubs they also contain some black and white spruce.
The presence of cryptogamic crusts reduces cryoturbation through surface stabilization (W.
5-7,) Fritillaria caballeroi is integrated in open pioneer-like grasslands that prosper on shallow, developed siliceous soils, subjected to strong phenomena of cryoturbation, on the Oromediterranean ("oreina" communities), generally on topographic scenarios of crests, steep slopes, or rocky spurs where the accumulation of snow is of little magnitude.
Five seeded and five planted plots were located on earth hummocks, a natural feature on the landscape created by cryoturbation, and five were positioned in hollows.
Differential raising, cryoturbation, and the geliexpansibility gradient
Because of the high degree of weathering and cryoturbation of surface sediment, particularly on older beaches, sediment 10 cm beneath the surface was exposed for photography, except where sorted circles brought underlying gravel to the surface.
Archaeological levels and stream-laid deposits are locally affected by cryogenic processes such as cryoturbation and frost-cracks (Fig.
The transition zone exhibits the effects of cryoturbation, contains abundant redistributed organic carbon, is enriched by ice in the forms of lenses, veins, and nets (reticulate vein ice) and has abundant soil moisture.
West of the erosion front is a treeless area, recently colonized with sparse alpine tundra, which showed evidence of strong cryoturbation (needle ice, frost heave, mud boils) and wind deflation of the topsoil.