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Quantifying and modelling the impact of land consolidation and associated field borders on soil redistribution in agricultural landscapes (1954-2009)

By Caroline Chartin, O. Evrard, Sébastien Salvador-Blanes, Florent Hinschberger, Jean-Jacques Macaire and Kristoph Van Oost

Abstract

International audienceField borders induce landscape fragmentation and have an important role on the spatial variability of soil erosion and deposition processes. Vegetated borders affect the hydrological and sedimentological connectivity across hillslopes, and all types of field borders act as lines of zero-flux against tillage translocation. This leads to the development of linear anthropogenic landforms (e.g., ridges-and-furrows, headlands, and lynchets) which will keep evolving after field border removal. This is particularly the case in western Europe where agricultural policy and mechanisation led to the massive removal of field borders through numerous land consolidation schemes (1960-1990). The aim of this study is to assess the effect of field borders and their removal on soil redistribution in a cultivated hillslope of the SW Parisian Basin. Recent patterns of soil redistribution are derived from 137Cs inventories and analysed with respect to the different topographical settings, especially linear anthropogenic landforms. Then, erosion and deposition rates are calculated using a conversion model that integrates the dominant processes of soil redistribution over the last fifty years. Results show that areas submitted to intensive erosion or deposition are mainly concentrated on linear landforms induced by field borders. The use of the conversion model highlights that soil redistribution is strongly dominated by tillage-induced processes. Land consolidation enhanced soil redistribution through the conversion of depositional areas into sediment delivering areas. Erosion and deposition processes induced by field borders and their removal appear to be very important when compared to mean soil redistribution in the entire study area

Topics: [SDE.IE]Environmental Sciences/Environmental Engineering, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology
Publisher: HAL CCSD
Year: 2012
OAI identifier: oai:HAL:hal-02320703v1
Provided by: HAL-INSU
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