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. 2023 Apr 10;23:188. doi: 10.1186/s12870-023-04178-y

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© The Author(s) 2023

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 6 — Correlations between root morphology traits, acid phosphatase activity, leaf Mn concentration, root biomass, and root P concentration (Note: Data from one- and two-year-old seedlings were used for both fine and coarse root analyses. Data for both one- and two-year-old seedlings were analyzed using both coarse and fine roots. A blue ellipse indicates a positive correlation, and a red ellipse indicates a negative correlation. The shape and color depth of the ellipse represent the absolute value of the correlation, and the flatter the ellipse and the darker the color, the greater the absolute value of the correlation. Asterisks denote significance levels (* P < 0.05, ** P < 0.01, *** P < 0.001). RL, root length (cm); SRL, specific root length (cm mg^–1); SA, root surface area (cm²); SRSA, specific root surface area (cm² mg^–1); RV, root volume (cm³); RTD, root tissue density (mg cm^–3); RB, root biomass (g plant^–1); RAPase, root APase (µmol pNP g^− 1 min^− 1); RP, root phosphorus (g kg^–1); Pi, soil inorganic P; and Po, soil organic P)