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. 2019 Feb 1;7:15. doi: 10.1186/s40168-019-0630-9

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© The Author(s). 2019

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. 5 — Spearman correlations between rare phyla and edaphic factors in maize and rice soils, displayed as heatmaps. Scale bars indicate correlation coefficients. Only significant correlations (p < 0.05) are shown. MAT, mean annual temperature; MAP, mean annual precipitation; OM, organic matter; DOC, dissolved organic carbon; MBC, microbial biomass carbon; TN, total nitrogen; AN, available nitrogen; NO₃, nitrate-nitrogen; NH₄, ammonium-nitrogen; MBN, microbial biomass nitrogen; CN, C:N ratio; MCN, microbial C:N ratio; AP, available phosphorus; AK, available potassium; TK, total potassium; TS, total sulfur; AS, available sulfur; AFe, available iron; TFe, total iron; and CEC, cation exchange capacity