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. 2018 Feb 16;8:3136. doi: 10.1038/s41598-018-21546-z

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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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The leaf carbon concentration (LCC, %), leaf nitrogen concentration (LNC, %) and leaf carbon-nitrogen ratio (C:N) of the three species under nitrogen treatments. Species: G, Galinsoga quadriradiata; H, Heteropappus hispidus; S, Sonchus oleraceus. Values are means ± SE. Means with the same letter were not significantly different at an alpha level of 0.05.