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Fig. 3 | Forest Ecosystems

Fig. 3

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

Fig. 3

N concentration (%) in bulk soil (a), coarse POM (cPOM 4000–250 μm, b), fine POM (fPOM 250–50 μm, c) and organo mineral fraction (OMF 0–50 μm, d) along rotations. 100A and 100E = pure acacia and eucalypt, respectively, while 50A50E = mixed-species (50% acacia and 50% eucalypt) stands. R1Y7 = Year 7 of the first rotation; R2Y2 = Year 2 of the second rotation and R2Y5 = Year 5 of the second rotation. Vertical bars are the standard errors of three-block averages. Different letters indicate significant differences at P = 0.05 between stand types at each rotation stage and along rotations

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