And the major results and some new viewpoints were presented as follow : 1 ) sediment content of cn tillage system in runoff process is substantially low compared to st under rainfall with high intensity , showing cn bear the efficient capacity of control soil loss . nevertheless , when soil is saturated , the runoff intensity of both tillage systems is near , implicating cn has the limited function of reducing runoff . 2 ) based on the case analysis of observed all rainfall - runoff generation processes , a ) the initiation time hysteresis of surface runoff generation is notable when rainfall fall upon the unsaturated purple soils , which is attributed to the property of rapid water sorption and much non - capillary porosity
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