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. 2016 Feb 12;6:20905. doi: 10.1038/srep20905

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Copyright © 2016, 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 cultivated area, sandy desert and swamp are not included in the analysis and are classified as others in the map. The boundary of the regions is adopted from Zheng²⁷. The land cover data were obtained from Compiling Committee of Chinese Vegetation (CCCV) with the scale of 1:1 000 000¹⁷. We generate the figure using ArcGIS software (http://www.arcgis.com).