Fig. 2
From: High-resolution maps of critical loads for sulfur and nitrogen in China
Critical loads of sulfur and nitrogen in China. The white colour in the map represents croplands or area with no vegetation represents croplands or area with no vegetation, where critical loads cannot be defined. (a) maximum critical load of sulfur; (b) minimum critical load of nitrogen; (c) maximum critical load of nitrogen; (d) critical load of nutrient nitrogen.
