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Title: Land evaluation studies in a part of Northern Nigeria
Author: Ameyan, J. O.
ISNI:       0000 0001 3419 4200
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 1980
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The main aim of the study is to examine the application of three genetic and developmental approaches to land evaluation which might be used as a basis for agricultural land use planning in Northern Nigeria. In common with most classificatory systems, each of these approaches is based upon a coherent body of concepts, and presupposes an implicit theoretical framework by means of which properties considered to be relevant in land evaluation are chosen. These structured sets of ideas thus in effect form theoretical models which are applied to the area to be studied. Using the conceptual framework of each approach, specific factors representing the nature of each are defined and techniques of Ordination, Classification and Clustering are used to expose the statistical relations of the variables measured and thus to explore and evaluate the pattern of relations between the factors implied by them. Variation in the upper solum is investigated through Principal Components Analysis (P.C.A.). This demonstrates that the upper solum is markedly heterogeneous and that no clear groups of sites which might be considered as natural soil groups are evident. Six soil series based on similarities in parent material and general profile characteristics are distinguished, and four physiographic units which may be considered land systems,uased on repeated land form patterns are recognised. Cluster Analysis is used to describe groups of soils with similar characteristics. The soil series. physiographic units and vegetation/land use patterns are then examined in terms of such relationships as can be demonstrated with the soil groups defined by the Cluster analysis. This shows that there are no strong demonstrable relationships between the soil groups produced by this analysis and the groups developed by conventional soil classification or by physiographic classification of the form of the land.Vegetation and land use patterns both within and between each cluster of soil properties also display marked variability which does not correspond to the variability in soil properties, suggesting that vegetation/land use patterns are not simple edaphically controlled groupings; and that the dominant influences are cultural; technological, and socio-economic. Environmental, vegetation and land use patterns are then compared with variation in soil properties using Canonical Correlation Analysis. This indicates that site, soil, technological, social and economic factors are very intricately mixed, interact strongly, and that the mix and the interaction themselves have strong ecological and agricultural implications. In conclusion the application of genetic and developmental approaches as a basis for agricultural land classification is evaluated by examining the above results together with other evidence from the earlier stages of the investigation. The implications of the results are then considered with reference to the general problem of land evaluation for land use planning in tropical Africa.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Geography