ブルキナファソ,モシ台地の小流域における土壌のトポシークエンスと農耕適性

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In a small river basin of the Mossi Plateau, Burkina Faso, the toposequences of soils along three transects were described and selected soil samples analyzed in order to determine the pedogeomorphic conditions for land use. The soils on each landform unit were classified and their suitability for farming examined. On a relic glacis, lithic leptosols with a continuous petroferric horizon at several centimeters below the surface are distributed. The land is not used for farming as the effective soil depth is very shallow. Various soil types on each glacis of the three transects were investigated. Ferric luvisols with a sandy loamy or sandy clay loamy subsoil are distributed in the upper reaches of a basin belonging to a tributary of the White Volta River. Although having high water permeability (10^<-3> cm s^<-1> through the profile) and a deep effective soil depth (more than 100 cm), the soil is moderately acid and poor in natural fertility. At a site in the middle reaches of the basin, two soil types, chromic cambisols and ferric luvisols, are dominant and display an irregular distribution. Although they are more fertile than the ferric luvisols examined from the upper reaches of the basin, they are less water-permeable and often shallower in effective soil depth due to the existence of either a compact silty or petroferric horizon. Within a riverain glacis of the White Volta River, there are eutric leptosols with a gravelly subsoil. This soil type is least favorable in terms of both physical and chemical characteristics. On a riverain plain, eutric cambisols occur and are characterized by a silty clay loamy texture at the surface. This soil type, with a deep effective soil depth and high water retentivity, is considered to be the most fertile of all soils distributed in the survey area and therefore the most suitable for farming.
社団法人日本土壌肥料学会の論文
1999-04-05

著者

南雲不二男
北海道大学大学院地球環境科学研究科

ブルキナファソ,モシ台地の小流域における土壌のトポシークエンスと農耕適性

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