Fig. 4: Factors driving the differences in AGC accumulation rates between PYF and NYF.

a Box plots of the AGC accumulation rate of PYF and NYF with the same age at 0.05°, 0.1°, and 0.2° scales. b The relative importance of temperature, precipitation, soil, topography, structure, and human activity. c Relationships between the differences in AGC accumulation rates between PYF and NYF with differences in the primary factors among each category. TRNU tree number, ISOT isothermality, PRSE precipitation seasonality; CEC soil cation exchange capacity, ELEV elevation, HUFP human footprint. *** represent significant differences at 99.9% confidence levels. Diff. Difference.