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. 2019 Mar 29;10:337. doi: 10.3389/fpls.2019.00337

FIGURE 1.

FIGURE 1

Ammonium, nitrate, glutamine-N, and arginine-N net uptake capacity (nmol N g-1 fw h-1) by fine roots of Fagus sylvatica, Quercus robur, and Pinus sylvestris seedlings at low and high soil N availability under different competition regimes. vs. Prunus = competition with Prunus serotina; vs. Robinia = competition with Robinia pseudoacacia. Box plots show mean (dotted line) and median (continuous line). Different letters indicate significant differences between competition regimes within a specific soil N availability treatment, and asterisks indicate significant differences between soil N availability treatments detected using permutational analysis of variance (p < 0.05).