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. 2016 Jul 22;7:1100. doi: 10.3389/fpls.2016.01100

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Copyright © 2016 Dziedek, Härdtle, von Oheimb and Fichtner.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Magnitude of treatment effect (MTE) for nitrogen addition (N), drought (D) and their combination (N+D). For each species (European beech: Fagus sylvatica, Sessile oak: Quercus petraea, and Douglas fir: Pseudotsuga menziesii), MTEs were predicted for (A) small-sized (initial height of 80 cm) and (B) large-sized trees (initial height of 130 cm) based on our best-fitting models (see Table 4). Error bars show standard errors based on across-species combination response. Different letters indicate significant differences (Tukey-test: P < 0.05) among species.