Table 3 CN ratio of bulk soil and soil fractions (cPOM; fPOM and OMF) and mass of fractions along rotations from the end of the first 7-year-rotation (R1Y7), to year 2 of the second rotation (R2Y2) and 5 of the second rotation (R2Y5)

CN bulk soil

16.9 (± 0.054) a

17.8 (± 0.48) a

17.1 (± 0.51) a

20.2 (± 0.43) a

22.7 (± 0.19) b

25.0 (± 0.27) a

11.3 (± 0.90) b

10.4 (± 0.66) b

9.7 (± 0.95) a

CN cPOM

19.4 (± 0.056) a

23.9 (± 0.68) b

26.5 (± 0.91) c

18.6 (± 0.16) a

22.2 (± 0.19) b

25.0 (± 0.27) a

18.8 (± 0.36) b

21.5 (±0.27) b

25.9 (± 0.88) a

CN fPOM

24.1 (± 1.68) a

27.1 (± 0.72) ab

25.4 (± 0.81) a

20.2 (± 0.32) a

24.7 (± 0.37) b

25.7 (± 0.41) a

20.8 (± 0.60) b

20.3 (± 0.77) b

22.8 (± 0.79) a

CN OMF

13.6 (± 0.034) a

15.3 (± 0.27) b

14.9 (± 0.43) b

14.3 (± 0.17) a

15.3 (± 0.18) b

16.2 (± 0.30) a

14.1 (± 0.33) b

14.9 (± 0.32) b

14.2 (± 0.31) a

cPOM (fraction per g)

0.11 (± 0.001) a

0.15 (±0.02) b

0.10 (± 0.01) a

0.41 (± 0.03) a

0.49 (± 0.03) b

0.34 (± 0.03) a

0.14 (± 0.01) b

0.18 (± 0.01) b

0.19 (± 0.03) a

fPOM (fraction per g)

0.20 (± 0.002) b

0.19 (± 0.02) b

0.17 (± 0.02) a

0.23 (± 0.01) a

0.30 (± 0.01) b

0.28 (± 0.02) a

0.35 (± 0.02) b

0.39 (± 0.02) b

0.40 (± 0.03) a

OMF (fraction per g)

1.91 (± 0.005) b

1.86 (± 0.04) a

1.83 (± 0.07) a

1.47 (± 0.03) a

1.64 (± 0.03) b

1.56 (± 0.05) a

2.01 (± 0.06) b

1.77 (± 0.03) b

1.81 (± 0.07) a