3.2.1. Variation in accumulative runoff sediment concentration
The accumulative runoff sediment concentration was greater on steeper
slopes (Fig. 4). For a given slope, however, sediment concentration was
lower with greater vegetation cover. Interestingly,
the
difference between sediment concentrations in different vegetation
covers increased with slope: accumulative runoff sediment concentration
at the 5° slope under different vegetation covers was low (maximum and
minimum values were about 1.4 kg/m3 and 0.7
kg/m3, respectively), whereas at 20° slope sediment
concentration varied between 19.7 and 7 kg/m3.
Therein, the difference of accumulative runoff sediment concentration
under different vegetation covers increased rapidly (5°–10° slope),
then leveled off (10°–15° slope) , and then increased rapidly (15°–20°
slope) (Fig. 4).
[Insert Figure 4]