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The Scientific World Journal
Volume 2013 (2013), Article ID 451710, 20 pages
http://dx.doi.org/10.1155/2013/451710
Research Article

Polder Effects on Sediment-to-Soil Conversion: Water Table, Residual Available Water Capacity, and Salt Stress Interdependence

1IC2MP-HydrASA Laboratory UMR 7285, ENSIP, 40 Avenue du Recteur Pineau, 86022 Poitiers, France
2INRA Domaine Expérimental Saint Laurent-de-la-Prée, 17450 Saint Laurent-de-la-Prée, France

Received 10 May 2013; Accepted 19 June 2013

Academic Editors: J. Bai, H. Cao, and B. Cui

Copyright © 2013 Raymond Tojo Radimy et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The French Atlantic marshlands, reclaimed since the Middle Age, have been successively used for extensive grazing and more recently for cereal cultivation from 1970. The soils have acquired specific properties which have been induced by the successive reclaiming and drainage works and by the response of the clay dominant primary sediments, that is, structure, moisture, and salinity profiles. Based on the whole survey of the Marais Poitevin and Marais de Rochefort and in order to explain the mechanisms of marsh soil behavior, the work focuses on two typical spots: an undrained grassland since at least 1964 and a drained cereal cultivated field. The structure-hydromechanical profiles relationships have been established thanks to the clay matrix shrinkage curve. They are confronted to the hydraulic functioning including the fresh-to-salt water transfers and to the recording of tensiometer profiles. The CE1/5 profiles supply the water geochemical and geophysical data by their better accuracy. Associated to the available water capacity calculation they allow the representation of the parallel evolution of the residual available water capacity profiles and salinity profiles according to the plant growing and rooting from the mesophile systems of grassland to the hygrophile systems of drained fields.