English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/18753
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Role of biological soil crust cover in bioweathering and protection of sandstones in a semiárid landscape )torrollones de Gabarda, Huesca, Spain)

AutorSouza-Egipsy, Virginia ; Wierzchos, Jacek ; Sancho, C.; Belmonte, Anchel; Ascaso, Carmen
Palabras claveBiological soil crust
Micro-weathering
Lichen
Cyanobacteria
Fungi
Moss
Fecha de publicación2004
EditorJohn Wiley & Sons
CitaciónEarth Surface Processes and Landforms 29: 1651-1661 (2004)
ResumenSandstone structural landscapes in the semi-arid Torrollones de Gabarda area (Province of Huesca, NE Spain) are often covered by a well developed biological soil crust of lichens, mosses and cyanobacteria and black coatings on vertical surfaces. By using scanning electron microscopy with backscattered detector imaging, the biological soil crust studied evidenced high activity in the sandstone–crust interface. Processes such as physical disintegration, etching and dwelling as well as biomineralization by calcium oxalate and fixation of mineral particles by extracellular polymeric substances were observed. On the horizontal sandstone surfaces these processes may cause the occurrence of gnammas and the development of a protective coating that favours intense flaking when the crust is disturbed. On the sandstone cliffs, columnar and tafoni weathering development is clearly guided by the protective action of the biological soil crust. These qualitative observations are important to develop methodologies to address their quantitative importance in geomorphological processes in semi-arid landscapes.
Descripción10 pages, and tables statistics, and figures.
Versión del editorhttp://dx.doi.org/10.1002/esp.1118
URIhttp://hdl.handle.net/10261/18753
DOI10.1002/esp.1118
ISSN0197-9337
Aparece en las colecciones: (IRN) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
embargo.pdf21,74 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.