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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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Co-occurrence networks of microbial communities and soil chemical factors in CK and AR treatments. AP: available P; AK: available P; AN: alkaline N; NH₄⁺-N: ammonium-N; NO₃⁻-N: nitrate-N; TC: total C; TN: total N; C/N: the ratio of total C to total N; M: soil moisture; EC: soil electrical conductivity; T: soil temperature. Nodes represent OTUs and soil factors with different shapes, and OTUs are colored by genus-level taxonomy. Edges indicate the significant (p < 0.05) relationships among different OTUs. AOA: ammonia-oxidizing archaea (A,B); nirS and nosZ: denitrifiers carrying nirS and nosZ genes, respectively (C–F). CK: non-acid addition, AR: pH 4.0 acid rain.