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Table 1 Soil properties of 59 soils of four soil types under two land-uses (natural land and cropped land) across China

From: Compositional and chemical characteristics of dissolved organic matter in various types of cropped and natural Chinese soils

Items

n

pH

SOM/%

DOC/mg/g

DON/mg/g

DOC/DON

CEC/cmol kg−1

TN/%

TC/%

TC/TN

All soils

59

6.52 ± 1.34

4.07 ± 1.51

0.09 ± 0.09

0.02 ± 0.01

7.0 ± 3.6

28.60 ± 7.42

0.19 ± 0.09

1.86 ± 1.28

11.9 ± 9.2a

Chernozem soils

16

7.82 ± 0.80a

6.61 ± 3.38a

0.16 ± 0.05a

0.02 ± 0.01a

7.2 ± 3.3a

32.12 ± 8.28a

0.17 ± 0.08a

1.69 ± 1.26a

10.8 ± 9.5a

 Natural

7

7.57 ± 0.99

9.45 ± 3.18*

0.18 ± 0.03

0.03 ± 0.01

5.0 ± 1.7

33.96 ± 9.84

0.15 ± 0.10*

1.70 ± 1.92

8.4 ± 2.6

 Cropped

9

8.01 ± 0.62

4.40 ± 1.16*

0.15 ± 0.06

0.02 ± 0.01

9.8 ± 2.9

32.91 ± 8.72

0.16 ± 0.05*

1.67 ± 0.45

14.0 ± 14.0

Cinnamon soils

14

7.96 ± 0.89a

3.39 ± 2.50b

0.11 ± 0.02ab

0.03 ± 0.01a

4.6 ± 2.3b

23.03 ± 8.90b

0.21 ± 0.07a

2.71 ± 1.84a

15.7 ± 14.5a

 Natural

5

8.67 ± 0.43

4.03 ± 3.81*

0.12 ± 0.02

0.03 ± 0.01

3.9 ± 1.7

17.46 ± 9.70*

0.14 ± 0.06*

3.63 ± 2.56

27.1 ± 19.8

 Cropped

9

7.56 ± 0.83

2.59 ± 1.67*

0.11 ± 0.02

0.02 ± 0.01

5.9 ± 2.9

21.67 ± 9.01*

0.29 ± 0.22*

2.20 ± 1.17

9.4 ± 4.5

Paddy soils

18

6.71 ± 1.17b

3.92 ± 1.55b

0.08 ± 0.08b

0.01 ± 0.01b

9.0 ± 2.8a

25.96 ± 6.93ab

0.22 ± 0.13a

2.66 ± 1.76a

12.2 ± 4.0a

Red soils

11

6.44 ± 1.49b

4.06 ± 1.73b

0.12 ± 0.11ab

0.02 ± 0.02a

6.5 ± 4.8a

27.60 ± 9.60a

0.16 ± 0.13a

1.84 ± 1.5a

8.3 ± 4.1a

 Natural

4

5.01 ± 0.73

5.46 ± 1.48*

0.10 ± 0.10*

0.03 ± 0.02

6.2 ± 5.6

26.54 ± 11.85*

0.08 ± 0.05*

0.84 ± 0.46

9.0 ± 4.4

 Cropped

7

7.25 ± 1.14

3.26 ± 1.54*

0.13 ± 0.12*

0.02 ± 0.02

7.1 ± 3.6

29.44 ± 4.39*

0.21 ± 0.14*

2.41 ± 1.68

6.9 ± 3.8

  1. The value was given by mean ± standard error. Different letters represent significant differences in soil properties between soil types
  2. n number of samples, SOM soil organic matter, DOC dissolved organic carbon, CEC cation-exchange capacity, TN total nitrogen, TC total carbon
  3. * Indicates significant difference in soil properties between natural and agricultural soils at P < 0.05 level