Evidence of short-term belowground transfer of nitrogen from Acacia mangium to Eucalyptus grandis trees in a tropical planted forest

Change over 60 days in δ15N values of young leaves of Eucalyptus grandis pairs located at 1.5 m, 3.3 m and 6.2 m from the 15N-labeled Acacia mangium. Mean background δ15N values ± standard error (n = 3) were 1.49 ± 0.36‰, 1.53 ± 0.35‰, and 1.58 ± 0.21‰, at 1.5 m, 3.3 m and 6.2 m, respectively. Vertical bars indicate standard errors between blocks (n = 3). At a given collection date and a given distance, * indicates significant differences with δ15N background values (P < 0.05).