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. 2019 Nov 7;9:16236. doi: 10.1038/s41598-019-52665-w

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© The Author(s) 2019

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 values and standard errors (whiskers) of visible porosity, Euler number and root length density for each of the three different treatments (bulk density of 1.30, 1.45, and 1.60 g cm⁻³) and depth within column (7–10 cm, 12–15 cm, 17–20 cm) derived from µCT-scans of 3 cm $\emptyset$ samples. Visible porosity shows pores >38 µm (two voxels), the Euler number shows the connectivity of pores >76 µm. Different letters indicate significant differences (n = 5). Inset shows the subsampling scheme.