DETERMINATION OF SOIL SALINITY USING THE REMOTE INVERSE WEIGHTING (IDW) METHOD: CASE OF THE SENEGAL RIVER DELTA IN MAURITANIA

Soil salinization is one of the most important indicators of soil degradation. This work, conducted in the Senegal River delta (southwestern Mauritania), assesses the effects of salinity on soil quality.Les analyses de la variation spatiale de la salinité, et les cartes de conductivité électrique effectuées et développées à l'aide d'une méthode d'interpolation et d'analyse spatiale tel que : Pondération Inverse à Distance (PID/IDW). The results show that the values of the remote inverse weighting (PID / IDW) in areas south and north of the delta higher than 17 so these areas are characterized by a high electrical conductivity (63.95mmohs / cm), and shows that the PID values in the center of the study area are <5 therefore characterized by a reliable electrical conductivity (0.289mmohs / cm) compared to other territories. It should be noted that the appearance of certain points, weak conductivities, dispersed in these zones, can be related to the structure of the soil. Comparing the results of this work with those of other studies, we note (Emadi and Baghernejad 2014, Karydas et al., 2009 and Poshtmasari et al., 2012) that PID (IDW) is a good predict conductivity. The results obtained showed that the best estimator is the PID method, which offers a good ability to predict electrical conductivity, with a Root Mean Square Error (RMSE) of 0.339 mmohs / cm and a correlation coefficient ( R2) of 0.9