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. 2021 Jan 14;11:1326. doi: 10.1038/s41598-020-79334-7

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© The Author(s) 2021

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 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/.

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The structural units and buffer in Plot C4 as an example: shadow are the buffer, 5 m from each edge. Solid circles denote live trees, and their sizes are proportional to the DBH. X and Y are two perpendicular coordinate axes of the plot. All DBH is enlarged 2.5 times for viewing purposes⁴⁷. This figure was generated by R (version 3.5.1, R Development Core Team 2020).