Table 2 Geochemical compositions and weathering index under different pedogenic processes.

From: Changes in the profile properties and chemical weathering characteristics of cultivated soils affected by anthropic activities

Sample types

Horizon

SiO2 (%)

Al2O3 (%)

Fe2O3 (%)

CaO (%)

MgO (%)

Na2O (%)

MnO (%)

K2O (%)

P2O5 (%)

TiO2 (%)

CIA

WLC

PIA

T1

A (n = 10)

70.09 ± 6.71

14.09 ± 2.23

5.38 ± 1.30

3.27 ± 3.47

1.88 ± 0.75

1.30 ± 0.56

0.07 ± 0.04

2.64 ± 0.74

0.13 ± 0.05

0.66 ± 0.13

67.35 ± 8.13

0.83 ± 0.20

73.28 ± 9.54

B (n = 5)

67.70 ± 5.31

15.12 ± 0.78

6.24 ± 0.55

3.62 ± 3.71

1.98 ± 0.51

1.44 ± 0.84

0.09 ± 0.04

2.86 ± 0.72

0.14 ± 0.05

0.74 ± 0.11

67.97 ± 9.90

0.82 ± 0.22

74.44 ± 12.53

C (n = 10)

70.42 ± 7.32

14.20 ± 2.62

5.18 ± 1.53

3.17 ± 3.00

1.84 ± 0.76

1.58 ± 0.62

0.08 ± 0.03

2.70 ± 0.68

0.12 ± 0.05

0.66 ± 0.16

64.81 ± 6.99

0.87 ± 0.20

70.08 ± 9.42

T2

A (n = 10)

65.55 ± 2.73

14.74 ± 0.34

4.96 ± 0.87

1.11 ± 0.26

2.23 ± 0.43

1.61 ± 0.42

0.10 ± 0.03

2.42 ± 0.24

0.16 ± 0.06

0.65 ± 0.12

68.35 ± 3.25

0.85 ± 0.07

74.22 ± 4.20

B (n = 3)

66.50 ± 1.90

15.06 ± 0.78

4.72 ± 1.13

1.06 ± 0.13

2.54 ± 0.40

1.53 ± 0.48

0.08 ± 0.03

2.53 ± 0.22

0.10 ± 0.06

0.65 ± 0.07

68.64 ± 2.55

0.89 ± 0.04

74.80 ± 3.33

C (n = 10)

65.10 ± 2.45

15.07 ± 0.56

5.44 ± 1.09

1.18 ± 0.22

2.46 ± 0.33

1.99 ± 0.21

0.10 ± 0.03

2.53 ± 0.29

0.13 ± 0.04

0.64 ± 0.11

65.78 ± 1.83

0.93 ± 0.08

70.75 ± 2.49

T3

A (n = 10)

63.78 ± 1.24

15.00 ± 0.40

5.69 ± 0.45

1.16 ± 0.09

1.73 ± 0.18

1.90 ± 0.32

0.09 ± 0.02

2.64 ± 0.23

0.17 ± 0.05

0.72 ± 0.03

66.12 ± 1.64

0.80 ± 0.06

71.55 ± 2.18

B (n = 8)

63.61 ± 1.23

15.16 ± 0.37

5.92 ± 0.52

1.14 ± 0.15

1.98 ± 0.06

2.23 ± 0.23

0.10 ± 0.02

2.63 ± 0.17

0.14 ± 0.03

0.72 ± 0.03

64.77 ± 0.82

0.87 ± 0.02

69.53 ± 1.16

C (n = 10)

64.44 ± 1.64

15.25 ± 0.28

5.39 ± 0.87

1.20 ± 0.15

2.12 ± 0.22

2.42 ± 0.36

0.13 ± 0.05

2.67 ± 0.18

0.11 ± 0.02

0.66 ± 0.12

63.49 ± 1.62

0.93 ± 0.07

67.78 ± 2.37

  1. T1, T2 and T3 represent the soils undergoing natural evolution (NE), tillage perturbation (TP) and engineering perturbation (EP); CIA = chemical index of alteration; WLC = weathering leaching coefficient; PIA = plagioclase index of alteration.
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