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. 2017 Sep 22;7:12165. doi: 10.1038/s41598-017-12437-w

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Redundancy analysis (RDA) triplot summarizing variation in PAHs uptake by maize across the soil properties and heavy metal uptake. PAHs and RCFs-Pb are included as explanatory variables that account for 61% (p < 0.01) and 20% (p < 0.01) of the total variance. Circles represent soils at different sites; red and blue arrows illustrate maize uptake of PAHs and heavy metals, respectively. Eigenvalues for the first two environmental gradients are presented.