The impact of soil preparation on the soil erosion rates under laboratory conditions (original) (raw)

Abstract

The use of laboratory methods in soil erosion studies causes soil disturbance, preparation and placement in experimental plots and has been recently considered more and more because of many advantages. However, different stages of soil removal, transfer, preparation and placement in laboratory plots cause significant changes in soil 5 structure and subsequently, the results of runoff, sediment concentration and soil loss. Knowing the rate of changes in sediment concentration and soil loss variables with respect to the soil preparation for laboratory studies is therefore inevitable to generalize the laboratory results to field conditions. However, there has been less attention to evaluate the effects of soil preparation on sediment variables. The present study was 10 therefore conducted to compare sediment concentration and soil loss in natural and prepared soil. To achieve the study purposes, 18 field 1 m × 1 m-plots were adopted in an 18 % gradient slope with sandy-clay-loam soil in the Kojour watershed, Northern Iran. Three rainfall intensities of 40, 60 and 80 mm h −1 were simulated on both prepared and natural soil treatments with three replications. The sediment concentration 15 and soil loss at five three-minute intervals after time-to-runoff were then measured. The results showed the significant (p ≤ 0.01) increasing effects of soil preparation on the average sediment concentration and soil loss. The increasing rates of runoff coefficient, sediment concentration and soil loss due to the study soil preparation method for laboratory soil erosion plots, were 179, 183 and 1050 % (2.79, 2.83 and 11.50 times), 20 respectively. 1998; Le Bissonnias et al., 2002; García-Orenes, 2010). Study of soil erosion and sed-886 SED 7, 2015 iment yield in the watershed is one of the basic necessities to achieve integrated land management and soil and water conservation. The identification and quantification of the hydrological properties and processes that induce runoff and soil erosion in necessary to determine the amount of soil erosion (Cerdà et al.

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