By means of Fuzzy methods

the western Shanxi Province can be divided into five gravitation erosion areas as follows:1. the northwestern breakdown area;the intensity in the area of gravitation erosion (for short I)is about 3

200t/km2·y

and accounting for about 2/3 of the total amount of soil erosion(for short m);2.the western slumping

breakdown area

the intensity is about 2

860-4

130 t/km2·y

and m is 45 to 65 percent;3.the central denudation

slumping and break- down area

intensity is about 4

460 t/km2·Y

and m is 16.9 to 34.7 percent; 4.the southern slumping

denudation area

the intensity is about 4

400 t/km2·y

and m is 51 percent; 5.the eastern weak gravitation erosion area

the intensity is less than 500 t/km2·y. Summarily

the amount of gravitation erosion makes up 35 to 46 percent of the total amount of soil erosion in western Shanxi Province.