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. 2017 Nov 10;7:15355. doi: 10.1038/s41598-017-15728-4

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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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Effects of MAT, Aridity and soil N content on: (a) fine root biomass, (b) coarse root biomass and (c) total root biomass response to eCO₂. Numbers adjacent to the arrows indicate the effect size of the relationship, while the p-values are shown in brackets. Continuous and dashed black arrows indicate positive and negative relationships, respectively, while grey arrows indicate non-significant relationships. R² denotes the proportion of the model variance explained. Overall goodness-of-fit test is shown in the bottom of each figure. Aridity was calculated as [AI in this dataset – AI in each site] so increases in aridity represent places with low water availability.