Spatial Variation of Wind Erodibility of Soils from the Northern State, Sudan

Motasim Hyder Abd Elwahab, Mukhtar Ahmed Mustafa, El Tayeb Ganawa

Abstract


Wind erosion is the predominant desertification process in the Northern State. Wind erodibility of soils (WE) is a main indicator of wind erosion. Thus, this study was conducted to obtain WE data and generate empirical relationships between WE and soil factors for the Northern State. Surface soil samples (0-3 cm) were collected from fifty farms widely spread in the State and non-erodible soil particles, NEP (> 0.84 mm in diameter), and several pertinent soil physical and chemical properties were measured by standard methods. Wind erodibility of these soil samples were assessed from NEP data using a standard table. Regression analysis showed that NEP significantly (P <0.001) increased with increase in clay content (r = 0.653), silt (r = 0.523), CaCO3 (r = 0.431), and clay/(silt + sand) (r = 0.625), and decreased with increase in sand (r = - 0.640), (silt + sand)/clay (r = - 0.635), (silt + sand)/(clay + organic matter) (r = - 0.618), and (silt +sand) / (clay +CaCO3) (r = - 0.677). The basic soil properties and their ratios gave the reverse effects on WE with slightly lower correlation coefficients. The (silt + sand)/ (clay+CaCO3) ratio is recommended as a index of both NEP and WE because it integrates the three durable primary soil particles and the slightly soluble CaCO3 salt. Multiple regression equations were derived for the prediction of NEP (r= 0.718) and WE (r = 0.682) from knowledge of the four soil properties. It is recommended to predict NEP and look up WE from the standard table. The determined NEP of the wind erodibility groups correlated very well with those established in other countries. The spatial variation of WE of the soils was mapped using GIS.

Keywords


Wind erosion; desertification; spatial variability

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