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. 2017 Sep 6;7:10584. doi: 10.1038/s41598-017-11163-7

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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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Mean NRE and PRE according to different classified standards. (a) Mean NRE across China’s forests, different climatic zones, different forest types, plantation and natural forests; (b) Mean PRE across China’s forests, different forest types, plantation and natural forests, and different stand stages. NRE: N resorption efficiency, PRE: P resorption efficiency, Young: forest in young stage, Mid-age: forest in mid-age stage, Mature: forest in mature stage. Abbreviations of forest types are the same as Fig. 1. The error bars represent the standard error. The main effects were significant when P < 0.05.