Element

Region

n

Range

mg·kg⁻¹

Mean ± S.D.

mg·kg⁻¹

C. V. (%)

Skewness

Kurtosis

B

Total

500

0.03 - 5.39

0.92 ± 0.68

73.43

2.02

6.40

Zhongshan

100

0.15 - 4.14

0.99 ± 0.74 B

74.58

1.45

3.03

Shuicheng

180

0.07 - 5.39

1.11 ± 0.80 A

71.94

1.89

5.27

Panzhou

220

0.03 - 3.09

0.74 ± 0.46 C

62.2

1.65

3.99

Cu

Total

500

0.03 - 21.15

2.55 ± 2.36

92.59

3.47

16.78

Zhongshan

100

0.03 - 21.15

3.00 ± 2.59 A

86.54

4.03

24.64

Shuicheng

180

0.05 - 17.16

2.41 ± 2.88 B

119.36

3.28

11.16

Panzhou

220

0.05 - 10.59

2.46 ± 1.67 Ab

67.79

1.93

5.09

Fe

Total

500

8.84 - 220.10

66.47 ± 35.77

53.81

1.25

2.42

Zhongshan

100

8.84 - 117.40

51.41 ± 23.72 C

46.13

0.59

0.03

Shuicheng

180

13.76 - 214.75

74.78 ± 39.10 a

52.29

0.94

1.31

Panzhou

220

13.08 - 220.10

66.52 ± 35.37 b

53.17

1.41

3.10

Mn

Total

500

3.75 - 70.80

47.26 ± 15.05

31.84

−0.84

−0.09

Zhongshan

100

5.74 - 66.05

43.46 ± 15.71 b

36.15

−0.38

−0.80

Shuicheng

180

3.75 - 67.50

42.86 ± 15.08 b

35.2

−0.55

−0.40

Panzhou

220

5.01 - 70.80

52.59 ± 12.94 A

24.61

−1.56

2.25

Mo

Total

500

0.02 - 2.51

0.39 ± 0.26

66.11

2.25

10.51

Zhongshan

100

0.13 - 1.45

0.44 ± 0.26 a

60.82

1.51

1.97

Shuicheng

180

0.02 - 1.15

0.41 ± 0.23 ab

56.56

0.61

−0.07

Panzhou

220

0.05 - 2.51

0.36 ± 0.28 b

76.56

3.45

19.28

Zn

Total

500

0.03 - 9.64

3.95 ± 1.62

40.9

0.32

0.43

Zhongshan

100

0.03 - 9.64

5.05 ± 1.67 A

32.97

−0.2

0.91

Shuicheng

180

0.06 - 9.34

3.87 ± 3.87 b

44.79

0.23

0.01

Panzhou

220

0.07 - 7.68

3.51 ± 1.22 c

34.69

0.17

1.12