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Soil Groups Relative Susceptibility to Erosion in Parts of South-Eastern Nigeria
Abstract
Insitu rainfall simulator runs were carried out on 15 soil groups located in various parts of South Eastern-Nigeria, namely Abia, Ebonyi and Imo States of South- eastern Nigeria. The tests were carried out under 'dry' and 'wet' soil conditions, each at rainfall intensities of 40, 60, and 90mmlhr. The resulting soil losses were analysed, and the relative susceptibility of the various soil groups to erosion by water determined based on the amount of soil lost during the various runs. Based on the 'erodibility ratings' the soils were finally categorised into 'moderately erodible', 'highly erodible', and 'very highly erodible' The moderately erodible (under wet run considerations), include Typic Dystropepts, (from sand stone), Gross Arenic Paleudult, Eutric Tropofluents, and Aquic Paleudult. The highly erodible include Typic. Tropaquept (Eutric Gleyso1s), Plinthic Tropudult, Arenic Ptdeudalt, Typic Tropoudult (Dystric ferralsol), and Orthoxic Tropudult (Rhodic Ferralsol). The very highly erodible erodible include Typic Dystropepts (from shale), Typic Tropudult (Orthic acrisol), Typic Tropudalf, Typic Hapludult, Orthoxic Tropudult (Dystric ferralsol), and Typic Tropaquept (Dystric Gleysol}. These groupings agree to some extent with those under the 'dry run’ condition.
