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. 2021 Oct 12;11:20603. doi: 10.1038/s41598-021-00215-8

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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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Bulk OC stocks related to soil density fractions (fLF and oLF = free and occluded light fraction; HF = heavy fraction) in mineralogical combinations under forest and cropland separated by soil depth. Sample numbers for the combinations are as follows: ‛low clay‒low Fe’ under forest (n = 4), ‛low clay‒high Fe’ under forest (n = 4), ‛high clay‒low Fe’ under forest (n = 3), ‛high clay‒high Fe’ under forest (n = 7); all cropland combinations (n = 3).