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. 2021 Jan 6;9(1):118. doi: 10.3390/microorganisms9010118

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Pearson correlations between alpha diversity indices of functional genes and soil physicochemical properties. AP: available P; AK: available K; AN: alkaline N; NH₄⁺-N: ammonium-N; NO₃⁻-N: nitrate-N; TC: total C; TN: total N; M: soil moisture; EC: soil electrical conductivity; T: soil temperature. OTUs: observed number of OTUs; Chao1: Chao1 richness index; PD: phylogenetic diversity index; Shannon: Shannon diversity index; Gini–Simpson: Gini–Simpson index; Evenness: Shannon’s evenness index. Cell entries are Pearson correlation coefficients (r) between two indices. Only significant correlations are shown. * p < 0.05, ** p < 0.01.