The relationships between slope categories and soil erosion under different land uses for the period 2000 to 2010 are shown in Fig. 7.
It shows an increase in soil erosion with increased slope gradient under the same land use type as in previous studies. However, significant differences in soil erosion responding to slope gradients differ from land uses. For forest, the mean soil erosion for slopes of 5–10°, 10–15°, 15–25° and more than 25°were increased by 60%, 77%, 98% and 91% compared with that for slope of less than 5°, respectively.
Soil erosion remarkably increased more for shrub and woods than for forest according to increment of slope gradients. For example, the averaged soil erosion for slopes of 5–10°, 10–15°, 15–25° and more than 25° increased by 154%, 241%, 301% and 273% in woods than for slope of less than 5°, respectively.
The similar characteristics were shown for dense, moderated and sparse grassland. There were significantly declining trends in the rates of soil loss for slopes of 5–10°, 10–15°, 15–25° and more than 25° under different land uses except for bare soil during the decade.
The declining trends for these slope gradients were larger in land uses with lower vegetable cover, such as woods, moderate and sparse grassland, and cropland.