Region

Parameter

Minimum

Maximum

Mean

St. D

Skewness

Kurtosis

Guangxi

${\text{pH}}_{{\text{H}}_{\text{2}}\text{O}}$

2.77

6.99

5.16

0.82

0.01

−0.36

(n = 442)

pH_KCl

2.41

6.51

4.27

0.89

0.74

−0.44

Yunnan

${\text{pH}}_{{\text{H}}_{\text{2}}\text{O}}$

4.01

6.93

5.19

0.60

0.68

−0.21

(n = 310)

pH_KCl

3.21

5.91

4.20

0.56

1.05

0.42