The relationships of the C0 to Ce and of k0 to k examined on China’s Loess Plateau (a, c) and in Southeast China, Southern Kenya and Southeast Brazil together (b, d). (IMAGE)
Caption
The C0 is measured surface soil organic carbon (SOC) concentration (g kg-1), k0 is the changing rate of SOC with soil depth within upper soils (0-40 cm) calculated from measured SOC, Ce is the SOC at the depth that the SOC is stable along profile (g kg-1), k is the changing rate of SOC with depth at a specific soil profile (cm-1). The Ce and k are parameters for negative exponential depth distribution function. The RMSE is the root mean square error of the relationship, R2 is determination coefficient of the relationship. The solid line is the fitted line of measured SOC to predicted SOC. Shaded area of solid line shows the 95% confidence interval.
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