Fig. 5: Sensitivity differences of ROC to Fe-OC and Ca-OC. | Communications Earth & Environment

Fig. 5: Sensitivity differences of ROC to Fe-OC and Ca-OC.

From: Asymmetric responses of soil organic carbon stability to shifting dominance of pH-mediated metal-bound organic carbon

Fig. 5

a Distribution patterns of ROC sensitivity to Fe-OC (Fe-OCk) and Ca-OC (Ca-OCk) across the profile scale; b Distribution patterns of Fe-OC, Ca-OC, and SIC contents across the profile scale in different soil layers; c Relationship between the relative sensitivity of ROC to Fe-OC and Ca-OC and the content of Fe-OC and Ca-OC. Points of different colors and shapes in b represent the average values of Fe-OC, Ca-OC, and SIC in specific soil layers; the solid line in c represents the fitting results based on an S-shaped distribution regression (R2 = 0.97, p < 0.001). Backgrounds of different colors indicate the three stages of ROC regulation by Fe-OC and Ca-OC. The inset illustrates the relationship between the relative sensitivity of ROC to Fe-OC and Ca-OC and soil pH.

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