Category

θSlope range

Winter

Spring

Summer

Autumn

Area Km2

%

Area Km2

%

Area Km2

%

Area Km2

%

1

Significant degradation

θ < −0.035

18,647.1

2.6

12,351.3

1.7

4870.7

0.7

137,223.7

19.2

2

Moderate degradation

−0.035 < θ > −0.025

13,575.9

1.9

12,441.0

1.7

5259.1

0.7

58,084.6

8.1

3

Mild degradation

−0.025 < θ > −0.015

18,026.6

2.5

12,211.4

1.7

11,956.7

1.7

62,151.4

8.7

4

No change

−0.015 < θ > 0.015

569,743.6

79.6

532,533.3

74.4

437,078.4

61.1

417,940.4

58.4

5

Mild improvement

0.015 < θ > 0.025

31,739.4

4.4

53,193.6

7.4

102,224.4

14.3

16,939.9

2.4

6

Moderate improvement

0.025 < θ > 0.035

33,787.9

4.7

44,542.9

6.2

73,276.1

10.2

13,880.8

1.9

7

Significant improvement

θ > 0.03

30,303.3

4.2

48,550.3

6.8

81,158.4

11.3

9602.9

1.3

Total

715,823.8

100

715,823.8

100

715,823.8

100

715,823.8

100