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. 2015 Jun 8;5:11146. doi: 10.1038/srep11146

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Copyright © 2015, Macmillan Publishers Limited

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Depth profiles (0–90 cm) of soil carbon (a) and pH (c) in Western Australian agricultural soils collected from trial sites where soil pH (−lime versus +lime) or soil organic matter (−OM versus +OM) had been historically altered and the correlation of soil carbon and pH with bacterial and archaeal amoA gene abundance (b and d). Error bars represent ± 1 SE. Trendlines show a log-linear fit (all regressions significant at P < 0.001). Soil pH was determined in a 1:5 (w/w) soil suspension in 0.01 M CaCl₂. Note: gene copy numbers are plotted on a log₁₀ scale.