Table 2 Contents of organic carbon within the grain size fractions of the topsoils after 3, 20, 55, 100, and 170 years under self-restoration and of an Albic Podzol, never been cultivated.

Sand

Silt

Clay

Depth

2.0 - 0.2 mm

0.2 - 0.063 mm

0.063 - 0.020 mm

0.020 - 0.0063 mm

0.0063 - 0.002 mm

<0.002 mm

cm

% of SOC

3 years

10(12)⁽¹⁾

33.0

19.3

21.6

8.4

10.8

6.3

22

34.6

15.8

22.2

5.7

13.9

7.5

33

35.0

9.5

16.4

6.9

10.8

8.7

40

39.1

6.5

11.1

8.2

14.1

13.1

20 years

2

38.9

12.3

20.5

8.6

10.4

8.3

18

20.4

10.5

17.1

12.5

16.6

15.2

25(28)

22.5

9.4

21.2

12.2

21.3

13.1

55 years

1

Nd

nd

nd

nd

nd

nd

8

32.2

6.8

10.1

12.3

11.4

9.1

19

24.4

7.8

15.2

21.7

13.6

13.3

100 years

2

43.1

3.3

23.9

7.2

13.1

9.1

5

41.3

5.1

15.2

15.3

10.9

6.8

10

37.1

6.5

16.4

23.6

8.9

7.0

170 years

2

50.1

4.4

14.5

9.0

13.8

8.1

6

31.2

4.9

16.2

12.7

14.1

9.3

15

30.5

9.1

17.3

16.4

10.1

13.8

Albic Podzol

6(8)

41.6

5.2

16.7

13.3

12.6

10.4

10

35.4

7.3

8.8

6.3

6.0

6.5