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. 2016 Jun 7;11:9. doi: 10.1186/s13021-016-0050-0

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© The Author(s) 2016

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.

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Fig. 6 — Results of the uncertainty simulations. a Number of field plots needed to reliably (pr=0.9, red line) estimate the mean ACD (Mg C ha⁻¹) of a substratum using quintile binning (note: a random selection of 1000 substrata are plotted for clarity). b Frequency distribution of the number of field plots needed to reliably estimate a substratum’s mean ACD. Same as in a but colored by the substratum’s c mean ACD, d elevation and e slope. Further topographic and climatic variables are shown in Additional file 1: Fig. S3