The Impact of Range Rehabilitation on Wind Erosion in Kenya

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Gachimbi L.N.
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Four sites in Ecological Zone VI of Marsabit, Kenya, were selected for study in 1991 and 1992 to test the management of trees and large shrubs through natural recovery, to compare such management with that in other areas subjected to continuous use, and to evaluate the effect of vegetation in soil loss and stabilization of sand dunes. Soil loss and sand stabilization measurements were carried out using erosion pins. Soil texture and organic matter changes within the first 10 cm was monitored. In all the cases studied, regeneration of natural vegetation led to recruitment of 50% trees and large shrubs, 32.35% annual herbs, 12.03% grasses and 5.62% dwarf shrubs over a 3- to 4-year period in the natural recovery plot. Soil deposition was at the rate of 446.5 t/ha in 1 year within the natural recovery plot, and soil loss was 95 t/ha in I year from areas subjected to continuous pastoral land use with minimal wind breaks. The soil had poor aggregate stability and ranged from loamy sand in areas subjected to natural recovery to sandy soil in areas under continuous use.
East African Agricultural And Forestry Journal, 61 (No. 2), p. 199-203