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Titre du document / Document title

Spatial heterogeneity of aggregate stability and soil carbon in semi-arid rangeland

Auteur(s) / Author(s)

BIRD S. B. (1) ; HERRICK J. E. (1) ; WANDER M. M. (2) ; WRIGHT S. F. (3) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) USDA-ARS Jornada Experimental Range, MSC 3JER, New Mexico State University, PO Box 80003, Las Cruces, NM 88003-8003, ETATS-UNIS
(2) Department of Natural Resources and Environmental Sciences, University of Illinois, 1102 S Goodwin Avenue, Urbana, IL 61801, ETATS-UNIS
(3) Sustainable Agricultural Systems Laboratory, USDA-ARS Beltsville Agricultural Research Center, 10300 Baltimore Avenue, Beltsville, MD 20705, ETATS-UNIS

Résumé / Abstract

To measure and manage for C sequestration in heterogeneous rangeland systems, we need to more fully understand spatial patterns of soil resources. Spatial distributions of aggregate stability and soil carbon were investigated in a semiarid rangeland in New Mexico, USA. Soil was analyzed from plant interspaces, black grama (Bouteloua eriopoda (Torr.) Torr.), and mesquite (Prosopis glandulosa Torr.) in a landscape-replicated study. Aggregate stability at the 250 μm scale, carbonate C, organic C and N, C:N ratio, and glomalin, were all highest under mesquite. Soil C:N ratio was the best predictor of aggregate stability. Estimates of metric tons of C per hectare in the top 10 cm were highly variable at patch and landscape scales, varying from 4.2 to 10.5 under mesquite and from 3.0 to 7.0 in interspaces. High variability of aggregate stability and soil C has important implications for C sequestration. We argue that this multi-scale soil heterogeneity must be considered when measuring and managing for C sequestration.

Revue / Journal Title

Environmental pollution    ISSN  0269-7491   CODEN ENVPAF 

Source / Source

Congrès
Advances in Terrestrial Ecosystem Carbon Inventory, Measurements, and Monitoring Conference, Raleigh, North Carolina , ETATS-UNIS (03/10/2000)
2002, vol. 116, no 3 (116 p.)  (1 p.1/4), pp. 445-455

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kidlington, ROYAUME-UNI  (1987) (Revue)

Mots-clés anglais / English Keywords

Organic matter

;

Fodder crop

;

Monocotyledones

;

Gramineae

;

Multipurpose tree

;

America

;

North America

;

United States

;

Spermatophyta

;

Angiospermae

;

Dicotyledones

;

Leguminosae

;

Carbon sequestration

;

Semi arid zone

;

New Mexico

;

Carbonates

;

Carbon nitrogen ratio

;

Organic carbon

;

Prosopis glandulosa

;

Spatial distribution

;

Aggregate

;

Heterogeneity

;

Sequestering power

;

Structure stability

;

Soil structure

;

Rangeland

;

Carbon cycle

;

Mots-clés français / French Keywords

Matière organique

;

Plante fourragère

;

Monocotyledones

;

Gramineae

;

Arbre but multiple

;

Amérique

;

Amérique du Nord

;

Etats Unis

;

Spermatophyta

;

Angiospermae

;

Dicotyledones

;

Leguminosae

;

Séquestration carbone

;

Désert Chihuahua

;

Bouteloua eriopoda

;

Zone semi aride

;

Nouveau Mexique

;

Carbonate

;

Rapport carbone azote

;

Carbone organique

;

Prosopis glandulosa

;

Répartition spatiale

;

Agrégat

;

Hétérogénéité

;

Pouvoir séquestrant

;

Stabilité structurale

;

Structure sol

;

Parcours(terrain)

;

Cycle carbone

;

Mots-clés espagnols / Spanish Keywords

Materia orgánica

;

Planta forrajera

;

Monocotyledones

;

Gramineae

;

Arbol objetivo multiple

;

America

;

America del norte

;

Estados Unidos

;

Spermatophyta

;

Angiospermae

;

Dicotyledones

;

Leguminosae

;

Zona semiárida

;

Nuevo Mexico

;

Carbonato

;

Relación carbono nitrógeno

;

Carbono orgánico

;

Prosopis glandulosa

;

Distribución espacial

;

Agregado

;

Heterogeneidad

;

Poder secuestrante

;

Estabilidad estructural

;

Estructura suelo

;

Pastura(terreno)

;

Ciclo carbono

;

Localisation / Location

INIST-CNRS, Cote INIST : 15173, 35400010343912.0120

Nº notice refdoc (ud4) : 13418667



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