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gcb12025-sup-0001-FigureS1.docxWord document389KFigure S1. Location of sampling sites obtained from a regional soil survey during 2001–2005 and national soil inventory during the 1980s. The sampling sites are displayed on a background of China's vegetation atlas at a scale of 1 : 1 000 000 (Chinese Academy of Sciences, 2001). The inset shows the location of grassland ecosystems at the background of the whole country.

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