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. 2018 Feb 12;8:2870. doi: 10.1038/s41598-018-21172-9

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© The Author(s) 2018

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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Relationships between annual GPP and the estimated key plant traits. The smoothed functions derived from the fitted generalized additive models (GAMs) show the GPP response to variations in the physical plant traits (summary statistics for the smoothed GAM functions are in Table S5). Shaded areas represent the 95% confidence intervals of the functional relationships. Black dots represent partial residuals.