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Table 4 Decrease (in percentages) in N and C concentrations in soil fractions along rotations from the end of the first 7-year-rotation (R1Y7), to year 2 of the second rotation (R2Y2, values used as references) and 5 of the second rotation (R2Y5)

From: Soil organic matter quality along rotations in acacia and eucalypt plantations in the Congolese coastal plains

Fractions cPOM (4000–250 μm) fPOM(250–50 μm) OMF (0–50 μm)
Stands Reference (R2Y2) R1Y7 R2Y5 Reference (R2Y2) R1Y7 R2Y5 Reference (R2Y2) R1Y7 R2Y5
N&C N% C% N decrease (%) C decrease (%) N decrease (%) C decrease (%) N% C% N decrease (%) C decrease (%) N decrease (%) C decrease (%) N% C% N decrease (%) C decrease (%) N decrease (%) C decrease (%)
100A 2.2 40 9 7 21 21 1.9 37 25 13 27 26 0.7 10 18 21 31 33
50A50E 1.9 41 18 13.9 24 26 1.6 40 14 7 11 35 0.7 11 21 21 31 35
100E 1.7 42 17 13.2 22 21 1.6 41 9 12 25 34 0.7 11 20 26 24 35
  1. 100A and 100E = pure acacia and eucalypt, respectively, while 50A50E = mixed-species (50% acacia and 50% eucalypt) stands. cPOM = coarse POM (4000–250 μm), fPOM = fine POM (250–50 μm) and OMF = organo-mineral fractions (> 50 μm). Different letters indicate significant differences at P = 0.05 between stand types at each rotation stage and along rotations