Fig. 7: A schematic diagram of dynamic changes of Fe-OC and Ca-OC dominating ROC within the soil profile at regional scale. | Communications Earth & Environment

Fig. 7: A schematic diagram of dynamic changes of Fe-OC and Ca-OC dominating ROC within the soil profile at regional scale.

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

Fig. 7

The three schematic soil profiles from right to left correspond to increasing aridity and soil pH. With the increase in aridity, which is accompanied by a gradual decrease in precipitation and a progressive thinning of surface cover, the depth of calcium carbonate accumulation gradually shifts upward. The response of ROC to Ca-OC and Fe-OC exhibited variations both horizontally and vertically across different soil layers.

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