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. 2019 Oct 11;10:1215. doi: 10.3389/fpls.2019.01215

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Copyright © 2019 McCormack and Iversen

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) and the copyright owner(s) 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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Principal components analysis of core root economic traits; root diameter, root tissue density (RTD), specific root length (SRL), and root nitrogen, all measured on first-order roots, together with mycorrhizal colonization rate. The analysis suggests departure from a singular root economics spectrum as root nitrogen and RTD (highlighted in red) are orthogonal to Axis 1 (highlighted in blue) which is defined by diameter, SRL and mycorrhizal colonization rate. Trait loadings for PC 1, 2, and 3 are given in Table 1 .