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. 2011 Nov 24;11:28. doi: 10.1186/1472-6785-11-28

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Copyright ©2011 Porté et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Relative height growth rates of the invasive and native species according to the environmental conditions. Relative height growth rates (RGR_h, mm. mm^-1. d^-1. 10^-3). Values are means of nine to twelve seedlings (± 1 SE of the mean) for the invasive species (A. negundo, full diamonds), late-successional native species (F. excelsior and F. angustifolia, grey triangles) and early-successional native species (S. alba and P. nigra, open squares) across the three shade levels (Full light C, Shade S, Deep shade SS), the two nutrient levels (nutrient supply N+ vs. no supply N-) and the two disturbance regimes (Disturbed D vs. Non-disturbed ND).