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. 2016 Apr 18;16:89. doi: 10.1186/s12870-016-0776-6

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© Jiang et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 7 — Comparisons of soil nitrogen concentration at each depth for the three taxa’s sites. Error bars represent SE. PJ, P. × jrtyschensis; PN, P. nigra; and PL, P. laurifolia. Significant differences in soil nitrogen concentration at each depth for the sites representing the habitat of each of the three taxa as revealed by ANOVA: NS not significant, P > 0.1; *P < 0.05; **P < 0.01; ***P < 0.001