Before the erosion experiment, to achieve uniform soil
water condition among plots, the simulated pre-rainfall at
very low intensity was supplied to soil surface covered with
cloth until draining the percolating water, then the plots
were left for 24 h. For the erosion experiment, the simulated
rainfall intensity at 58–62 mm h1 was continuously
supplied for 2 h to enhance severe erosion in slope model
plots. Falling height of raindrop was 1.19 to 1.49 m, and
raindrop size was 3.12 mm in diameter. Amount of surface
runoff, the losses of soil, nitrogen and phosphorus were
subsequently observed.