Figure 1 | Scientific Reports

Figure 1

From: Soil resources and element stocks in drylands to face global issues

Figure 1

Global distribution of soil organic C content and stock to 2-m depth. Based on the aridity index (AI), or ratio of total annual precipitation to potential evapotranspiration, drylands are divided into hyperarid (AI less than 0.03 mm mm−1), arid (AI within the rage from 0.03 to 0.2 mm mm−1), semiarid (AI from 0.2 to 0.5 mm mm−1), and dry subhumid regions (AI from 0.5 to 0.65 mm mm−1). Box, first and third quartile; central horizontal line, median; whisker, 1.5 times the interquartile range, or maximum or minimum if less.

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