inscription
PORTAIL D'INFORMATION GÉOGRAPHIQUE

Hydraulic properties of biological crusts on sand dunes studied by 13C-CP/MAS-NMR : A comparison between an arid and a temperate site

Auteur(s) et Affiliation(s)

FISCHER, T.
Brandenburg Univ. of Technology, Central Analytical Lab., Cottbus, Allemagne
YAIR, A.
Dept. of Physical Geography, Hebrew Univ., Jerusalem, Israel
VESTE, M.
CEBra - Centre for Energy Technology Brandenburg, Cottbus, Allemagne
GEPPERT, H.
Brandenburg Univ. of Technology, Central Analytical Lab., Cottbus, Allemagne


Description :
Using principal component analysis (PCA), the AA. studied the relationships between hydraulic properties and 13C-CP/MAS-NMR shift regions of biological soil crusts (BSCs) on sand dunes under arid and temperate conditions. The arid study site was located near Nizzana, in the northwestern Negev, Israel and the temperate site was near Lieberose, Brandenburg, Germany. BSCs were sampled at each site near the dune crest, at the center of the dune slope and at the dune base. The soil texture was finer and water holding capacities (WHCs) were higher in Nizzana, whereas surface wettability was reduced in Lieberose. At both sites, BSCs caused extra WHC compared to the mineral substrate. Infiltration kinetics was attributed to polysaccharide hydration and swelling. The findings support the hypothesis that hydraulic properties of BSCs are determined by extracellular polymeric substances (EPS) and soil texture. Hydraulic properties in BSCs result from the combination of chemical properties related to C compounds mainly dominated by carbohydrates and physical surface properties related to texture, porosity and water holding capacity.


Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2013, vol. 110, p. 155-160, nombre de pages : 6, Références bibliographiques : 38 ref.

Date :
2013

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

Langue :
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)