Fig. 2From: Mercury distribution in the surface soil of China is potentially driven by precipitation, vegetation cover and organic matterThe maps of factors and relationships of Hg levels in surface soil with these factors. Spatial distribution of a wet deposition in China; b NDVI and c soil organic matter (created using ArcGIS Geographic Information Systems software version 10.2, Environmental Systems Research Institute Inc, Redlands, Calif). Significant relationships between soil Hg level and d precipitation, f NDVI and h SOM. All data including soil Hg level, precipitation, NDVI and SOM were corrected for variation in sampling intensity by subsampling. Median, range, upper quartile, and lower quartile of soil Hg for each interval of e precipitation, g NDVI and i SOMBack to article page