IGB

Connexion

(Article of periodic en Anglais - 2013)

Document title

Changes in ecosystem structure, function and hydrological connectivity control water, soil and carbon losses in semi-arid grass to woody vegetation transitions

Authors(s) and Affiliation(s)

PUTTOCK A. (1) ; MACLEOD C.J.A. (2) ; BOL R. (3) ; SESSFORD P. (4) ; DUNGAIT J. (5) ; BRAZIER R.E. (1) ;
(1) Geography, College of Life and Environmental Sciences, Univ., Exeter, ROYAUME-UNI
(2) The James Hutton Inst., Aberdeen, ROYAUME-UNI
(3) Inst. of Bio- and Geosciences, Agrosphere (IBG-3), Jülich, ALLEMAGNE
(4) College of Engineering, Mathematics and Physical Sciences, Univ., Exeter, ROYAUME-UNI
(5) Rothamsted Research, Sustainable Soils and Grassland Systems, Okehampton, ROYAUME-UNI

Abstract

The AA. investigate changing hydrological connectivity as an emergent property of changing ecosystem structure over 2 contrasting semi-arid grass to woody vegetation transitions in New Mexico. Vegetation structure is quantified to evaluate if it can be used to explain observed variations in water, sediment and carbon fluxes. Hydrological connectivity is quantified using a flow length metric, combining topographic and vegetation cover data. Results demonstrate that the 2 woody-dominated sites have significantly longer mean flowpath lengths than the grass-dominated sites. Mean flowpath lengths illustrate a significant positive relationship with the functional response. The woody-dominated sites lost more water, soil and carbon than their grassland counterparts. Woody sites erode more and lost more organic carbon than grasslands. Finally, hydrological connectivity (expressed as mean flowpath length) is discussed as a meaningful measure of the interaction between structure and function and how this manifests under the extreme rainfall that occurs in semi-arid deserts

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2013, vol. 38, no13 [pp. 1602-1611]

Bibliographic references : 2 p.

Collation : 4 fig., 5 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3455

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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