Extended Data Table 2.

Unstandardized coefficients of CUE-SOC relationship in the mixed-effects model with data assimilation results

CUE was set as the fixed effects to logarithmic SOC content. Climate types that soil profiles belong to were set as the random effect. We applied mixed-effects models that considered random intercepts and random slopes to test the CUE-SOC relationship. The random effects size ${\mathrm{n}}_{\mathrm{climate}}$ = 12. The total observation size $n_{\mathit{obs}}$ = 56,270. The observation size is different from the total soil profile size (i.e., 57,267) because the climate type information is not available for some profiles.