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]