Table 4 Average monthly methane fluxes (unit in mg m⁻² h⁻¹) or observed monthly emissions (unit in g m⁻², represented by ‘*’) at 21 sites.

1

Jiangsu (2019)

S

5.09

3.83

4.38

0.05

¹¹⁰

Jiangsu (2020)

S

19.28

3.03

5.10

4.67

¹¹⁰

Jiangsu (2021)

S

2.51

0.55

1.99

2.90

¹¹⁰

2

Jiangsu

S

20.04

9.48

9.90

1.67

¹¹¹

3

Jiangsu

S

0.49*

26.77*

17.74*

7.93*

1.71*

¹¹²

4

Anhui

S

0.70

3.28

2.96

-0.69

0.00

¹¹³

5

Fujian

S

13.54

18.70

20.55

0.00

¹¹⁴

6

Jiangxi

D

1.08

10.15

7.78

0.11

13.12

2.79

0.04

¹¹⁵

7

Beijing

S

0.32

2.01

3.66

1.20

0.44

0.03

¹¹⁶

8

Hubei

S

10.35

14.94

21.55

8.40

¹¹⁷

9

Hunan

D

14.01

1.25

0.30

36.05

9.52

5.06

¹¹⁸

10

Hunan

D

11.56

7.57

2.16

33.21

9.25

3.02

¹¹⁹

11

Guangdong

D

2.20

4.29

4.82

9.72

13.80

3.67

0.52

¹²⁰

12

Guangxi

D

38.26

33.74

3.50

8.08

33.33

47.88

23.97

¹²¹

13

Chongqing

S

0.75

0.44

0.25

0.19

¹²²

14

Sichuan

S

7.22

14.37

9.32

9.98

¹²³

15

Sichuan

S

18.96

44.20

40.15

32.07

¹²⁴

16

Yunnan

S

1.60 *

6.13*

6.73 *

2.45*

¹²⁵

17

Heilongjiang

S

4.99

24.12

19.26

23.48

2.24

¹²⁶

18

Heilongjiang (2017)

S

2.91*

11.87*

9.57*

2.26*

0.17*

¹²⁶

Heilongjiang (2018)

S

2.19*

7.53*

13.56*

7.09*

1.05*

¹²⁶

19

Liaoning (2017)

S

3.52*

2.22*

5.65*

0.70*

2.17*

0.22*

¹²⁶

Liaoning (2018)

S

−0.35*

5.47*

4.11*

5.78*

3.50*

1.23*

¹²⁶

20

Jilin

S

9.75

20.78

12.25

4.83

¹²⁷

21

Xinjiang

S

3.49

13.27

0.96

0.48

0.05

-0.38

¹²⁸