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Effect of Mulching on Sediment in Runoff From Simulated Rainfall¹

ABSTRACT

Simulated rainfall was used to test the relationship between sediment in runoff and percent of the soil that was mulch covered. Oak leaves (Quercus Douglasii H. & A.), redwood litter (Sequoia sempervirens (D. Don) Endl.) and oat straw (Avena barbata Brot.) were used as mulches on a 0.37m² plot of Auburn (loamy, mixed, thermic, Ruptic-Lithic Xerochrepts) surface soil at a 9% slope. Cover percentage was related to sediment in surface runoff by a parabolic relationship. The relationship between redwood and oak covers and sediment in runoff was not significantly different, but both were significantly different from oat straw. Cover shape or distribution of inter-cover space appears to be important in affecting sediment loss. Runoff volume was significantly reduced by high cover levels which protected the soil from sealing and helped maintain a high infiltration rate.

¹ Contribution of the Dep. Land, Air and Water Resour., Univ. of Calif., Davis. Presented before Div. S-6, Soil Sci. Soc. Am., 29 Nov. 1976 at Houston, Texas.

² Assistant Professor and Post Graduate Research Associate Dep. Land, Air and Water Resour., Univ. of Calif., Davis, CA 95616.

Received for publication August 29, 1977. Accepted for publication January 31, 1978.

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