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. 2015 Jun 19;5:11439. doi: 10.1038/srep11439

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Copyright © 2015, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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The maps were created using the ARC GIS 9.3. Symbols for the Yanqi Basin are the same as in Figure 1. Soil carbon contents were measured for all profiles, but δ¹³C only determined in those profiles marked with closed symbols.