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Fig. 6 | Annals of Forest Science

Fig. 6

From: Nitrogen fixation rate of Acacia mangium Wild at mid rotation in Brazil is higher in mixed plantations with Eucalyptus grandis Hill ex Maiden than in monocultures

Fig. 6

Seasonal variation of the percentage of N derived from fixation (%Ndfa) in Acacia mangium trees growing in monospecific stands (100A) and mixed-species stand with Eucalyptus grandis trees (50E:50A–Acacia). Vertical bars indicate standard deviations between trees (n = 4). Different letters indicate significant differences in %Ndfa (p < 0.05) between treatments at each sampling date. The %Ndfa values of acacias changed significantly throughout the year (p < 0.05). %Ndfa was taken to be 0 when the x(15N) value was higher in individual acacias than the mean x(15N) value in the eucalypts

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Annals of Forest Science

ISSN: 1297-966X