The performance of the currently reported seven depth distribution functions in fitting deep soil organic carbon (SOC) (IMAGE)
Caption
The box chart showing the determination coefficient (R2) and root mean square error (RMSE) of seven depth distribution functions in fitting SOC concentration along soil profiles on China’s Loess Plateau (a, c) and other regions (Southeast China, Southern Kenya and Southeast Brazil together) (b, d). The upper, intermediate and lower edges of box indicate the 75% quartiles, median and 25% quartiles of the R2 or RMSE, respectively. The gray point is R2 or RMSE of each measured profile. The x-axis is the seven depth distribution functions. NEF: Negative exponential function; EDF: Exponential decay function; PF: Power function; LF: Logarithmic function; TEF: Type III exponential function; FIPF: First-degree inverse polynomial function; REF: Revised exponential function.
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