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(Article of periodic en Anglais - 2010)

Document title

Spatial and temporal patterns of talus activity - a lichenometric approach in the Stubaier Alps, Austria

Authors(s) and Affiliation(s)

SASS O. (1) ;
(1) Inst. of Geography, Univ., Innsbruck, AUTRICHE

Abstract

A calibration curve was derived from 5 sites of known age and adapted to the prevailing size of talus boulders in the Finstertal valley (Austria). The AA. measured the 5 largest lichens on more than 300 boulders and the percentage coverage of Rhizocarpon-free clasts on more than 1000 test fields. Considerably enhanced activity was found under rockwalls influenced by permafrost, particularly on the north faces at an elevation of >2600 m a.s.l. At currently moderately active sites, boulder falls seem to have been slightly more frequent in the late nineteenth and first half of the twentieth century. Rockwall retreat rates derived from lichen coverage are higher than the rates derived from direct rockfall measurements. The rates derived from lichen coverage have to be taken with caution as the effects of debris redistribution are hard to quantify

Source

Article of periodic

published at : Geografiska annaler. Series A. Physical geography / ISSN 0435-3676 / CODEN GAPGAP

Editor : Svenska sällskapet för antropologi och geografi, Stockholm - SUEDE (1965)

Millesime : 2010, vol. 92, no3 [pp. 375-391]

Bibliographic references : 56 ref.

Collation : 9 fig., 2 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 2704 A

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1111/j.1468-0459.2010.00402.x

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2011
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