资 源 简 介
应用背景M-K非参数检验以及M-K突变检验已被广泛的用于水文气象时间序列的趋势变化分析，其优势在于不需要样本遵循一定的分布，也不受少数异常值的干扰假设原序列 H0无趋势，如果1 −α /21−α/2− Z ≤Z≤Z，接受原假设 H 0；如果1 −α/2Z ≥ Z或1 −α/2Z ≤ −Z时，拒绝原假设0
H ，即该序列变化趋势显著。 Z >0时表示序列呈上升趋势， Z <0时表示序列呈下降趋势。Z 的绝对值越大，说明序列变化趋势越显著。在显著性水平 α =0.05时， 1.961/2=αZ
关键技术没有什么难点，When rainfall events were classified as RR1 and the PI30 values of the rainfall events were higher than 400 mm mm h−1, soil loss prediction equation based on the total rainfall events would underestimate soil loss; while in other conditions, it would overestimate the soil loss. So, rainfall regime classification is necessary to precisely predict soil loss of individual rainfall event. This study could enhanced XX enlarge the knowledge of soil erosion mechanism and prediction model establishment at the hillslope with ephemeral gully.
