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Research Article |

Genesis and Classification of Soils on a Toposequence in Guelendeng, Southwest Chad

A study was carried out in Guelendeng in the south west of Chad with the objective to determine the main process at the origin of soil formation and to classify the soils along a toposequence. Three pedological profiles have been dug with variable depths. The three soil profiles namely G1, G2 and G3 were dug respectively, in the upslope, midslope and the footslope; samples were collected from each horizon in each of the three profiles. The collected samples were labelled and sent to laboratories for mineralogical, geochemical and physicochemical analyses. The mineralogical analysis of the collected samples allowed to highlight the dominance of primary minerals, namely quartz and feldspar. The geochemical analysis of the samples collected in the different profiles shows that SiO2 is by far the most abundant oxide. The physicochemical analysis shows very high sand contents ranging from 72.5 to 88.00% in profile G1; from 73.5 to 76.5% in profile G2 and from 75.0 to 79.5% in profile G3. In each profile, sand contents increase with depth. The pH-water varies from 5.1 to 6.5 in profile G1; in profile G2, it varies from 5.5 to 6.6; it is from 5.4 to 5.9 in profile G3. The pH values are highest in the surface horizons and decrease with increasing depth. For each sample, the change in pH (ΔpH) is negative. The sums of exchangeable bases are low as are the exchangeable cations. The cation exchange capacities are also low as shown by the values of the exchangeable cation sums. The other nutrients, namely calcium, magnesium, organic carbon, nitrogen, available phosphorus, potassium, sodium and organic matter are also very poorly represented and the C/N values are also very low. According to the WRB, all three soils in the site are Arenosols. The colors of the different pits induce some nuances in the designations. According to the CPCS, they are sols ferrugineux tropicaux peu ou non lessivés. The dominant process of pedogenesis is monosiallitisation. The bad drainage due to relatively less abundant rainfall is the factor responsible for the presence of 2/1 minerals like smectite.

Chad, Arenosols, Sols Ferrugineux, Monosiallitisation

APA Style

Issiné, A., Goalbaye, T., Amine Cherif, A., Toukou, H. (2023). Genesis and Classification of Soils on a Toposequence in Guelendeng, Southwest Chad. Earth Sciences, 12(6), 225-232.

ACS Style

Issiné, A.; Goalbaye, T.; Amine Cherif, A.; Toukou, H. Genesis and Classification of Soils on a Toposequence in Guelendeng, Southwest Chad. Earth Sci. 2023, 12(6), 225-232. doi: 10.11648/

AMA Style

Issiné A, Goalbaye T, Amine Cherif A, Toukou H. Genesis and Classification of Soils on a Toposequence in Guelendeng, Southwest Chad. Earth Sci. 2023;12(6):225-232. doi: 10.11648/

Copyright © 2023 Authors retain the copyright of this article.
This article 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.

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