The spatial distribution of annual average rainfall erosivity (R factor) of the Loess Plateau for 2000–2010 is shown in Fig. 2-a, and the annual average R value was 1824 MJ mm ha−1 h−1 yr−1.
The spatial distribution of the R values show a significant increasing trend from the northwest
to the southeast of the Loess Plateau, ranging from 208 to 5664 MJ mm ha−1 h−1 yr−1.
The map of K values in Fig. 2-b was generated to show the spatial distribution of soil erodibility, and the average K factor of the Loess Plateau was 0.0424 t ha h ha−1 MJ−1 mm−1
, varying from 0.0082 to 0.0658 t ha h ha−1 MJ−1 mm−1.
The slope steepness and slope length (LS) values in Fig. 2-c ranged from 0 to 113. The areas
with higher LS values were located in the hilly and gully regions and the mountainous areas with steep topography on the Loess Plateau, which indicates that these regions were topographically prone to erosion.
The vegetation cover factor (C) map is shown in Fig. 2-d. The annual average C value was 0.1146 between 2000 and 2010 on the Loess Plateau.
The spatial distribution of the C factor showed a decreasing trend from the northwest to the southeast of the Loess Plateau. The areas with lower C values were well covered by forest, shrub, and grass