ABSTRACT:
Simulated rainfall was applied to large runoff plots that were bare or covered with sagebrush and grass. Soil erosion on the vegetated plots was negligible; on the bare plots soil loss averaged 1.9 t/ha from lower intensity rain on dry soil and 16.6 t/ha from higher intensity rain on prewet soil. Antecedent soil moisture condition had a pronounced effect on erosion. The universal soil loss equation greatly overestimated measured loss on dry soils, but was within 13 to 51% of measured losses on prewetted plots with a 10% slope. Comparison of predicted and measured soil losses on a 32% slope suggested that overestimation was due partly to the USLE's slope value.
Footnotes
George E. Hart is an associate professor in the Forest Resources Department, Utah State University, Logan, 84322. The study was sponsored by a university research grant and the Utah Agricultural Experiment Station.
- Copyright 1984 by the Soil and Water Conservation Society
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