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The influence of Saharan dust deposits on La Palma soil properties (Canary Islands, Spain)

Long-term degradation of fragile landscape systems

Auteur(s) et Affiliation(s)

Institute of Geography, Univ., Leipzig, Allemagne
GLASER, B.
Martin-Luther-Univ. Halle-Wittenberg, Soil Biogeochemistry, Halle, Allemagne
Dep. of Geosciences, Univ., Bayreuth, Allemagne
BRODER, T.
Dep. of Geosciences, Univ., Bayreuth, Allemagne
ZANG, U.
Dep. of Geosciences, Univ., Bayreuth, Allemagne
EIGENMANN, R.
Dep. of Geosciences, Univ., Bayreuth, Allemagne
KOPP, B.
Dep. of Geosciences, Univ., Bayreuth, Allemagne
REICHERT, M.
Dep. of Geosciences, Univ., Bayreuth, Allemagne
LUDWIG, Z.
Dep. of Geosciences, Univ., Bayreuth, Allemagne
FLETCHER, W.J.
Geography, School of Environment and Development, Univ., Manchester, Royaume-Uni
FAUST, D.
Institute of Geography, Technical Univ., Dresden, Allemagne
ZIELHOFER, C.
Institute of Geography, Univ., Leipzig, Allemagne


Description :
This study investigates the spatial distribution of Saharan dust on the island of La Palma, and determines its influence on soil properties and thus on the ecosystem of the island. Since silt-sized quartz is not autochthonously formed on the island, it served as a reliable indicator for Saharan dust. Quartz was identified and quantified using X-ray diffractometry. The influence of Saharan dust additions on soil properties was assessed by texture analyses and analyses of plant-available phosphorous, an element strongly limiting plant-growth on the island due to its fixation in the structure of amorphous volcanic clay. A luff–lee-effect revealed significant influence on dust distribution, whereas small geomorphologic structures as hollows and mounds hardly influenced the dust distribution pattern. Thus, the input of Saharan dust influences soil fertility of La Palma and is an important factor regarding the fragility of the La Palma ecosystems.


Type de document :
Article de monographie

Source :
Catena (Giessen), issn : 0341-8162, 2013, vol. 103, p. 44-52, nombre de pages : 9, Références bibliographiques : 1 p.

Date :
2013

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena

Langue :
Anglais
Droits :
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