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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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Correlations among diameter, root tissue density (RTD), specific root length (SRL), and nitrogen content of first-order roots and mycorrhizal colonization rate (Mycorrhizal Col.). Linear fits and Pearson’s correlation coefficient (r) are shown for significant relationships (p ≤ 0.05) along with sample numbers (N). Note that quadratic fits better capture non-transformed data in some cases but do not change the observed trends. Black circles in the upper diagonal show transformed data and gray circles in the lower diagonal are non-transformed. Kernel density plots show the distribution of non-transformed data.