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. 2020 Jul 2;10:10851. doi: 10.1038/s41598-020-67467-8

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© The Author(s) 2020

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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Scans and photomicrographs [plain polarized light (PPL)] from thin sections of field N2 illustrating the alteration of RF soils by biota. (A) Thin section from 60 cm depth, a mixed organo-mineral layer with large bio-pores and root channels infilled with faunal excrements. (A1) Soil structure made from bacillo-cylindric faunal excrements. (A2) Soil pore filled with degraded faunal excrements. B: Thin section from 85 cm depth encompassing three distinct layers (organic-mineral-organic) with boundaries (dashed red lines) blurred by mixing. (B1) Earthworm excrements (ec). (B2) Channel built by termites/ants (tc) infilled with bacillo-cylindric faunal excrements, most probably produced by small annelids (Enchytraeidae) or mites. Thin sections were analyzed with a Leica DMLP 2000 microscope. For complete documentation of micromorphology, see SI.