Assessment and Mapping of Wind Erodibility of Soils of South Western Kassala State in Sudan

Intisar Al-Mamoon Abdel-Gadir, Mukhtar Ahmed Mustafa, El-Tayeb Ganawa

Abstract


Replicate surface soil samples were collected at random from
each of forty six geo-referenced (GPS) farms, spread in south west
Kassala State, to generate non-erodible soil particles (NEP > 0.84 mm)
and equivalent wind erodibility (WE) data. Selected soil physical and
chemical properties were measured using standard procedures. The mean
NEP values ranged from 15.0 to 66.9% with a mean of 42.0% and a CV
equal to 33.9%. The equivalent WE ranged from 34.2 to 262.0 with a
mean of 122.6 ton/ha and a CV of 48.7%. Regression analysis gave a
highly significant (P<0.001) increase of NEP with increase of clay (C, r =
0.806), or organic matter (OM, r = 0.961), and significant (P <0.05)
decrease with increase of sand (S, r = - 0.329). The impact of silt (Si) was
not significant. Furthermore, the results showed significant (P<0.001, r = -
0.721) decrease of NEP with increase of [(S+Si)/C)/(C+OM)] or
[(S+Si)/(C+CaCO3)] (P< 0.05. r = - 0.365) and the reverse trends were
obtained for the relations of WE and the various single or compound soil
indicators. Multiple regressions relationships of NEP or WE with clay,
OM, sand, CaCO3, and Sodium adsorption ratio (SAR) gave coefficients
of determinations equal to 89 and 86%, respectively. Although OM gave
slightly better accountability of the variation of NEP or WE (92%), the
multiple regression equation are preferred for the prediction of NEP or
WE, because OM unlike the resilient particle-size distribution is sensitive

to water and crop residue management. Furthermore, it is recommended
to use the following equation to predict NEP and look up the equivalent
WE from the standard Table:
NEP (%) = 18.6 + 0.31 Clay (%) + 27.0 OM (%) - 0.05 Sand – 0.51 Ca CO3 (%)
-96.1 SAR (R2 = 0.892)
The spatial variation of NEP and WE was mapped using GIS.


Keywords


Wind erosion; aggregation; Aridisols; Entisols; GIS

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