Influence of rainfall intensity on the interrill erodibility of two rangeland soils
1994
Goff, B.F. | Bent, G.C. | Hart, G.E.
Rangelands are subject to wide variations in rainfall intensity, and rainfall intensity is an important parameter in erosion models. This study measured interrill erosion rates for two rangeland soils for different rainfall intensities using a laboratory rainfall simulator. Both the general power equation E = aIb, and its constant exponent form E = cI2 (where E is interrill erosion rate, I is rainfall intensity, a and b are fitted parameters, and c is an interrill erodibility coefficient), adequately modeled interrill erosion response (r2 > 0.93 and r2 > 0.83 for the two models, respectively). These results indicate that the constant exponent model can be applied to rangeland soils. Interrill erodibility coeffficients, c, for natural rainfall conditions were estimated to be 6.5 X 10(5) kg s m-4 for the sandy loam soil and 8.8 X l0(4) kg s m-4 for the clay loam soil. These values were one to two orders of magnitude lower than those reported for agricultural soils, but were within the range for rangeland soils.
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