Sediment yield as a desertification risk indicator

Catchments; Erosion; Mediterranean; Off site impacts; Reservoir sedimentation; Scale issues; Added values; Catchment hydrology; Catchment scale; Desertification risk; Erosion process; Main process; Orders of magnitude; Scale-dependency; Sediment deposition; Sediment sources; Sediment yields; Soil erosion; Soil erosion rate; Soil loss; Time-periods; Anoxic sediments; Climatology; Ecology; Runoff; Sedimentation; Sedimentology; Soils; Desert Climate; Environmental Monitoring; Geologic Sediments; Geological Processes; Soil; Water Pollutants; Europe; Mediterranean Region

Abstract :

[en] Soil erosion is often regarded as one of the main processes of desertification. This has led to the use of various desertification indicators that are related to soil erosion. Most of these indicators focus, however, on small spatial units, while little attention has been given to the amount of sediment exported at the catchment scale. Such a small spatial unit approach neglects the transfer of sediment through catchments as well as the scale-dependency of erosion processes. Furthermore, this approach does not consider important off-site impacts of soil erosion, such as sediment deposition in reservoirs, flooding as well as ecological impacts.This study aims to illustrate the importance of also considering catchment sediment yield (SY, tkm-2y-1) in desertification assessment studies. Based on recently established databases of SY and soil loss rates in Europe and examples from previous studies, we illustrate that soil erosion rates at the plot scale are not representative for catchment SY, as they are often several orders of magnitude smaller. Also, the erosion response of catchments to changes in land use or climate often differs strongly from responses to those changes at the plot scale. We further discuss several of the impacts of SY and their link with desertification: i.e. the sedimentation of reservoirs, problems related to flooding, catchment hydrology, export of nutrients and ecological implications.Using earlier established criteria we evaluate the potential for using catchment SY as a desertification indicator and conclude that this could give an important added value to desertification studies. SY, used in combination with other indicators, allows the identification of other sediment sources than those considered at the plot scale and can reflect the results of desertification processes over longer time periods than periods over which assessments at the plot scale have been made. We argue therefore, that SY is a strong complementary indicator of desertification providing valuable information on the catchment response to changes in drivers of desertification. © 2011 Elsevier B.V.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Vanmaercke, Matthias ; Université de Liège > Département de géographie > Géographie physique et du quaternaire

Poesen, J.; Geography Division, K.U.Leuven, Belgium

Maetens, W.; Geography Division, K.U.Leuven, Belgium

de Vente, J.; Estación Experimental de Zonas Áridas, EEZA-CSIC, Desertification and Geoecology Department, Almeria, Spain, School of Geosciences, University of Aberdeen, Aberdeen, United Kingdom

Verstraeten, G.; Geography Division, K.U.Leuven, Belgium

Language :

English

Title :

Sediment yield as a desertification risk indicator

Publication date :

2011

Journal title :

Science of the Total Environment

ISSN :

0048-9697

eISSN :

1879-1026

Publisher :

Elsevier Science, Amsterdam, Netherlands

Volume :

409

Issue :

Pages :

1715-1725

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 28 March 2017

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