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. 2019 Jul 10;14(7):e0219159. doi: 10.1371/journal.pone.0219159

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© 2019 Inatomi et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 7 — (a) Relationships in the meta-analysis data. Orange dashed curve is obtained by Gauss-Newton non-linear regression of an exponential function: fN₂O_nit = 47.59 exp(–1.345 · pH) (R² = 0.557). Grey curve shows an empirical function by Martikainen (1985) for reference. (b) Global distribution of fN₂O_nit estimated using the regression curve and soil pH map (S1 Fig).