Fig. 4: Statistics on soil organic carbon (SOC) for areas grouped by different cropland soil exposure conditions.
From: Globally increased cropland soil exposure to climate extremes in recent decades
a SOC grouped by the average annual duration of soil exposure. b SOC grouped by positive and negative trends in soil exposure during 2001–2022. c SOC grouped by positive and negative trends in soil exposure to climate extremes from 2001–2022. In boxplots, the horizontal lines, from bottom to top, represent the minimum, first quartile, median, third quartile, and maximum values, respectively. The width of the boxes in each box plot represents the number of pixels. ** indicates that the differences in SOC between groups were tested using Welch’s t-test, with p < 0.05. Δ represents that the magnitude of difference between groups were tested using Glass’s Delta.
