Journal of Food, Agriculture and Environment

Factors and mechanisms influencing interrill erodibility at different rainfall intensities

Author(s):

Abbas Ahmadi ^1*, Mohammad Reza Neyshabouri ¹, Hassan Rouhipour ², Hossein Asadi ³, Mehdi Irannajad ⁴

Recieved Date: 2009-10-18, Accepted Date: 2010-04-02

Abstract:

Aggregate stability and soil texture are two influential factors governing soil erodibility. Previous studies have shown that at the transport-limited regime, pre-detached particles and at the detachment-limited regime, soil structure control sediment delivery. This study tried to analyze rule of factors and mechanisms governing interrill erodibility at different rainfall intensities. Samples from 36 soil series with contrasting properties were collected from northwest of Iran. A rainfall simulator with drainable tilting flume (1m × 0.5 m) at slope of 9 % was employed and interrill erodibility (K_i) was calculated for 20, 37, and 47 mm h^-1 simulated rainfall intensities. Results showed a positive correlation (r = 0.286 – 0.804) between K_i and clay content. In contrast to textural variables, the r values of K_i to the structure related indices (wet aggregate stability (WSA), mean weight diameter (MWD) and geometric mean diameter (GMD)) turned to be greater and significant at higher rainfall intensities. These probably imply that at higher rainfall intensities, soil detachment by raindrops limits sediment yield, but at lower intensities, transport limits sediment delivery. The correlation of K_i to GMD was greater than that to MWD, implying that the proportion of smaller aggregates in sediment load was greater than larger aggregates.

Keywords:

Aggregate stability, interrill erodibility, rainfall intensity, soil texture

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 2
Category: Environment
Pages: 996-999

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