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[ Article ] Water Erosion in the Donga Soils in Subhumid Zone in West Africa

Date de soumission: 12-08-2021
Année de Publication: 2020
Entité/Laboratoire Laboratoire d'Ecologie Appliquée (LEA)
Document type : Article
Discipline(s) : Sciences du sol
Titre Water Erosion in the Donga Soils in Subhumid Zone in West Africa
Auteurs AVAKOUDJO JULIEN [1], KOUELO Félix Alladassi [2], Kindomihou Valentin Missiakô [3], AKPONIKPE Pierre Irénikatché [4], Azontonde Anastase Hessou [5], SINSIN Brice Augustin [6], AKPLO Tobi Moriaque [7], Agonvinon Mahugnon Socrate [8],
Journal: Journal of Environmental Protection
Catégorie Journal: Internationale
Impact factor: 1.55
Volume Journal: 11
DOI: 10.4236/jep.2020.1112068
Resume The runoff and soil loss were assessed in situ at the scale of 2.12 m 2 plots during the rainy season of 2010 to better understand the determinants and magnitude of the massive soil loss and land subsidence (donga) in the sub-humid zone of Africa in Karimama, North Benin. The experimental de- sign was a split plot with two factors: the topography in 3 modalities (up- stream, center and downstream of the donga) was assigned as main plot fac- tor and the degree of degradation of dongas in 2 modalities (beginner dongas and advanced dongas) was assigned as subplot factor. Runoff water was col- lected through a storage system composed of two tanks. Data were collected on 36 plots (9 plots per donga × 4 dongas). The runoff varies significantly from one site to another for the rainy episode of October 10, 2010. It is twice as high in land use areas (5.87 mm) as in W Park (2.32 mm; l.s.d. = 1.81 mm). From upstream to downstream, runoff and soil loss increased from 2.4 mm to 85.3 mm and 80 g∙m −2 to 197 g∙m −2 , respectively. Runoff is high in the early dongas (7.60 mm) and low in the advanced dongas (5.68 mm) in contrast to lower soil loss in the early dongas (34 g∙m −2 ) and high in the advanced dongas (237 g∙m −2 ). The low value of soil loss with respect to the magnitude of the phenomenon suggests the probable occurrence of other soil loss mechanisms to be elucidated.
Mots clés W National Park, Land Use Areas, Dongas, Runoff, Erosion, Soil Loss
Pages 1073 - 1088
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