An ecological history

Element

Soil depth

Chemical discharged sites (N = 4)

Crop land (N = 7)

Grazing land (N = 2)

Undisturbed sites (N = 2)

Cu

0 - 15 cm

0.83 ± 0.27

0.28 ± 0.14

0.18 ± 0.14

0.34 ± 0.12

15 - 30 cm

0.79 ± 0.36

0.17 ± 0.11

0.18 ± 0.04

0.58 ± 0.42

Fe

0 - 15 cm

3.8 ± 2.26

0.82 ± 0.81

7.70 ± 3.95

2.60 ± 1.86

15 - 30 cm

6.63 ± 6.76

0.77 ± 0.92

6.30 ± 1.85

10.3 ± 13.22

Mn

0 - 15 cm

1.70 ± 0.55

0.97 ± 0.72

0.26 ± 0.26

3.73 ± 3.99

15 - 30 cm

1.54 ± 0.41

0.73 ± 0.52

0.08 ± 0.63

2.92 ± 3.01

Zn

0.15 cm

0.49 ± 0.16

0.43 ± 0.18

0.59 ± 0.15

1.26 ± 0.90

15 - 30 cm

0.49 ± 0.20

0.35 ± 0.13

0.57 ± 0.13

0.98 ± 0.94

Ni

0 - 15 cm

0.03 ± 0.02

0.02 ± 0.01

0.01 ± 0.00

0.01 ± 0.00

15 - 30 cm

0.03 ± 0.01

0.02 ± 0.01

0.00 ± 0.00

0.03 ± 0.02

Pb

0.15 cm

0.02 ± 0.01

0.02 ± 0.01

0.03 ± 0.01

0.03 ± 0.02

15 - 30 cm

0.02 ± 0.01

0.02 ± 0.01

0.03 ± 0.01

0.03 ± 0.01