By analysis of the data of field simulated rainfalls, it can be concluded that in the Loess Hilly Region, the critical rainfall intensity that can distiguish the two main runoff-production modes on grass and bushes ranges from 1.40 mm/min to 1.45 mm/min. And on bare sloping field, the critical rainfall intensity that make sharp transfomation of sediment-yield intensity ranges from 1.50 mm/min to 1.53 mm/min. At the same time, the sedimentyield charicterdistics of different land use was presented, and finds ...
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