Table 6 Relationships between erosive rainfall thresholds and rainfall intensity under different erosion intensity classes on abandoned land slopes across the study regions.

Suide

Severe

< 30

> 35

1.143 ± 0.202

65

y = 0.705x − 2.565

0.90

3.6

0.769 ± 0.205

93

y = 0.486x − 6.292

0.90

13.0

0.497 ± 0.118

37

y = 0.378x − 9.696

0.91

25.6

0.238 ± 0.075

19

y = 0.237x − 8.813

0.91

37.2

Extremely intense

30–45

> 35

1.181 ± 0.178

20

y = 0.632x − 4.988

0.90

7.9

0.770 ± 0.202

22

y = 0.259x − 4.176

0.92

16.1

0.572 ± 0.180

13

y = 0.185x − 5.485

0.90

29.6

Xifeng

Intense

30–45

25 ~ 35

0.824 ± 0.246

16

y = 0.266x − 1.411

0.91

5.3

0.687 ± 0.223

18

y = 0.131x − 1.709

0.91

13.1

0.548 ± 0.200

15

y = 0.064x − 1.604

0.90

25.1

Moderate

45–60

25 ~ 35

0.777 ± 0.271

30

y = 0.246x − 1.434

0.91

5.8

0.454 ± 0.133

10

y = 0.196x − 4.692

0.93

23.9

0.368 ± 0.108

8

y = 0.044x − 4.692

0.90

31.6

Moderate

60>

25 ~ 35

1.167 ± 0.130

36

y = 0.212x − 1.206

0.95

5.7

0.845 ± 0.144

29

y = 0.147x − 2.507

0.92

17.1

0.543 ± 0.088

20

y = 0.113x − 3.362

0.90

29.9