Mots-clés
Analyse isotopique Bilan sédimentaire Erosion des sols Etats-Unis Géochimie Idaho Incendie de forêt Inventaire Plomb Versant Vitesse d'érosion Erosion rate Forest fire Geochemistry Idaho Inventory Isotope analysis Lead Sediment budget Slope Soil erosion United States of America Análisis isotópico Balance sedimentario Erosión de los suelos Estados Unidos Geoquímica Incendio forestal Inventario Plomo Velocidad de erosión VertienteApplication of 210Pbex inventories to measure net hillslope erosion at burned sites
Auteur(s) et Affiliation(s)
PERREAULT, L.M.
Center for Ecohydraulics Research, Univ. of Idaho, Boise, Etats-Unis
YAGER, E.M.
Center for Ecohydraulics Research, Univ. of Idaho, Boise, Etats-Unis
AALTO, R.
Geography, College of Life and Environmental Sciences, Univ., Exeter, Royaume-Uni
Description :
Fallout radionuclides, including lead-210 excess (210Pbex), have only recently been applied in burned terrain. The AA. collected over 400 soil samples from unburned, moderately and severely burned forested sites in central Idaho. They measured soil 210Pbex content at stable reference and eroding sites and in mineral and organic soil components. At all sites, organic matter had the highest concentration of 210Pbex. The results indicate that most 210Pbex in these semi-arid, forested sites was bound to organic matter, and that a substantial portion of this lead was lost due to forest fires. Thus, given methodological uncertainties, 210Pbex losses due to fire, and the subsequent sensitivity of calculated net erosion rates to these lower 210Pbex inventories, the AA. suggest this method should not be used in burned terrain to calculate absolute net erosion and deposition rates. However, within a given burned site, 210Pbex inventories still provide useful information describing relative soil losses and storage across the landscape.
Type de document :
Article de périodique
Source :
Earth surface processes and landforms, issn : 0197-9337, 2013, vol. 38, n°. 2, p. 133-145, nombre de pages : 13, Références bibliographiques : 1 p.
Date :
2013
Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)