《Table 4 Rainfall threshold (T) required to generate runoff, and slope of the rainfall-runoff curve

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《Efficiency of soil and water conservation practices in different agro-ecological environments in the Upper Blue Nile Basin of Ethiopia》

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Note:n，number of observations；*，regression significance at P<0.05 level.

Taking into account the interactions between the soil and water conservation measures and the two dominant land use types，which were cultivated land on steep slopes（CL2）and grazing land（GR2），we calculated the rainfall thresholds required to generate runoff for both of these at each agroecology system（Fig.4；Table 4）.The threshold rainfall can be determined by plotting the daily runoff depth against the corresponding rainfall depth（Fig.4）and performing least-squares regression（Descheemaeker et al.，2006；Girmay et al.，2009）.The slope of the regression line represents how rapidly runoff depth increases with increasing rainfall depth after the rainfall threshold is exceeded.The threshold rainfall values were selected based on the probability of 80%of events below the threshold level rainfall failing to produce runoff.The higher the rainfall threshold and the lower the slope of the curve，the higher the infiltration rate and greater the storage capacity of the soil in the agro-ecology system（Descheemaeker et al.，2006；Girmay et al.，2009）.