4.4. Interpretation of soils maps
The typology of soils and textures thus defined consists of six classes
(Figure 5), these nomenclatures according to: Jones and al, 2013;
Faraoun, 2013; Benaouda, 1997; IUSS Working Group WRB, 2015; World
Reference Base for Soil Resources 2014, update (2015); International
soil classification system for naming soils and creating legends for
soil maps and World Soil Resources Reports No. 106. FAO, Rome.
- Class 1: Calcaric Cambisols, with Loam, Silty loam texture and
geological substrate are Limestone sandstone, Limestone marl
- Class 2: Rendzic Leptosols, Calcaric Cambisols with Loamy sand, Sandy
clay loam, loamy sand textures and geological substrate are limestone
sandstone, limestone sandstone and hard limestone.
- Class 3: Calcisols, Calcaric Fluvisols with Sandy loam texture and
geological substrate are limestone sandstone and clay.
- Class 4: Humic calcisols, Calcaric Cambisols with loamy texture and
geological substrate are limestone sandstone, limestone marl
- Class 5: Leptosols, Calcaric Cambisols with Sandy loam texture and
geological substrate are limestone sandstone, limestone marl
- Class 6: Humic Cambisols (Rubic-Brunic) with Loamy texture sand and
geological substrate is hard limestone rock.
The analysis of the maps of soil changes in the study area; show us the
dominance of agricultural soils of the type Calcisols, Calcaric
Fluvisols. The statistics for 1987 and 2018; show a clear increase
reached at most 55% of the total area. In second position Calcaric
Cambisols and Rendzic Leptosols, Calcaric Cambisols type soils are very
marked by average areas of the order of 16% up to 23%. The humic
calcisols, Calcaric Cambisols and Leptosols, Calcaric Cambisols and
humic Cambisols (Rubic-Brunic) soils are poorly represented. The most
remarkable typologies of textures are : Sandy loam, Loamy sand,
Loam,Silty loam and Sandy clay loam.
Figure 5: Maps of the evolution of soils type of the 1987 to
2018 of study area