Horizontal ridge rupture
As shown in Figures 6 and 7, mulching could not totally prevent contour
ridge rupture, especially under heavy rainfall conditions; for example,
the ridge of Hr was destroyed at both rainfall intensities, while that
of Hr+Cm occurred only at 100 mm h-1. The ridge
rupture occurred earlier at 100 mm h-1 than at 50 mm
h-1. The averaged runoff rate of Hr was 3.83-fold
greater after ridge rupture than before at 50 mm h-1,
being 22.63- and 1.55-fold greater under Hr and Hr+Cm at 100 mm
h-1, respectively. Meanwhile, the average soil loss
rate of Hr was 13.84-fold greater after ridge rupture than before at 50
mm h-1, being 94.70- and 1.14-fold greater under Hr
and Hr+Cm at 100 mm h-1, respectively.