3.1. Variation in total runoff
On the four slopes, total runoff
under different vegetation covers was slow at first (0–5 mins), then
increased rapidly (5–10
min),
and then leveled off (10–30 mins) (Fig. 2). Based on these runoff data
curves, total runoff under 0% vegetation cover was slightly greater
than runoff under the other two vegetation covers at first, but by 30
mins runoff under 0% cover was similar or lower than 15% and 30%,
suggesting that the effect of surface condition and infiltration of
spatial heterogeneity on runoff was considerable.
[Insert Figure 2]
Slope and vegetation are the primary factors affecting runoff, and
different slopes and vegetation covers can generate varying runoff. Fig.
3 shows that the features of mean runoff and runoff difference between
different vegetation covers. Duration of scouring time, the mean runoff
and total runoff showed significant differences between different
vegetation covers on the 5° and 10° slope, while the difference was not
significant on the 15° slope and 20°
slope (Fig. 3).
[Insert Figure 3]