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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Soil organic carbon enrichment of dust emissions : magnitude, mechanisms and its implications for the carbon cycle

Auteur(s) et Affiliation(s)

WEBB, N.P.
USDA-ARS Jornada Experimental Range, Las Cruces, Etats-Unis
STRONG, C.L.
Atmospheric Environmental Research Centre, Griffith School of Environment, Griffith Univ., Brisbane, Australie
CHAPPELL, A.
CSIRO Land and Water, Canberra, Australie
MARX, S.K.
GeoQuEST Research Centre, School of Earth and Environmental Science, Univ., Wollongong, Australie
MCTAINSH, G.H.
Atmospheric Environmental Research Centre, Griffith School of Environment, Griffith Univ., Brisbane, Australie


Description :
This study examines the SOC content and enrichment of dust emissions measured using Big Spring Number Eight (BSNE) wind-vane samplers across 5 land types in the rangelands of western Queensland, Australia. The results show that sandy soils and finer particulate quartz-rich soils are more efficient at SOC emission and have larger SOC dust enrichment than clay-rich aggregated soils. The AA. hypothesize that stronger inter-particle bonds and the low grain density of the aggregated clay soil explain its reduced capacity to release SOC during saltation, relative to the particulate sandy soils. They also show that size-selective sorting of SOC during transport may lead to further enrichment of SOC dust emissions. These preliminary results provide impetus for additional research into dust SOC enrichment processes to elucidate the impact of wind erosion on SOC flux and reduce uncertainty about the role of soil erosion in the global carbon cycle.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2013, vol. 38, n°. 14, p. 1662-1671, nombre de pages : 10, Références bibliographiques : 1 p.

Date :
2013

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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