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. 2019 Nov 15;20:869. doi: 10.1186/s12864-019-6246-4

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© The Author(s). 2019

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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

PMC Copyright notice

Fig. 10 — The position of the sample in China, where the blue area represents the dense sampling site of the representative area of North China f10:2 (Shandong). Sampling positions in Shandong Province were specially highlighted as yellow magnified area map. Base layer map date©OpenStreetMap contributors (page: https://www.openstreetmap.org/copyright)