Category

θSlope range

Winter

Summer

Autumn

Area Km2

%

Area Km²

%

Area Km2

%

1

Significant degradation

θ < −0.035

21,307.1

0.9

23439.6

0.9

128506.4

5.1

2

Moderate degradation

−0.035 < θ > −0.025

24,978.6

1.0

34998.9

1.4

112684.1

4.5

3

Mild degradation

−0.025 < θ > −0.015

58,275.7

2.3

72830.1

2.9

192501.9

7.7

4

No change

−0.015 < θ > 0.015

2,020,584.8

80.8

2014143.7

80.5

1782067.7

71.3

5

Mild improvement

0.015 < θ > 0.025

210,813.6

8.4

144869.6

5.8

134926.4

5.4

6

Moderate improvement

0.025 < θ > 0.035

110,011.8

4.4

128752.2

5.1

100675.8

4.0

7

Significant improvement

θ > 0.03

55,038.6

2.2

81975.8

3.3

49647.8

2.0

Total

2,501,010

100

2501010

100

2501010

100