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. 2023 Feb 9;16(3):250–256. doi: 10.1038/s41561-023-01125-2

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© The Author(s) 2023

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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Fig. 4 — a, Kernel density estimates of observed and predicted (z_CWDX80) rooting depth by biome, based on data aggregated by sites, shown by vertical coloured tick marks. b–e, The 10% (b,d) and 90% (c,e) quantiles of observed versus predicted (z_CWDX80) rooting depth by biome of all data (b,c) and of a subset of the data where the WTD was measured along with rooting depth (d,e). Classification of sites into biomes was done on the basis of ref. ⁴³. Dotted lines in b–e represent the 1/1 line. r is the Pearson’s correlation coefficient, and P is the test statistic based on Pearson’s product moment correlation coefficient.