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Figure 2

From: Iron oxides and aluminous clays selectively control soil carbon storage and stability in the humid tropics

Figure 2

Multiple linear regression of bulk OC content in relation to aluminous clay (clay) and pedogenic Fe oxides (Fed) contents for all mineralogical combinations in 5‒10 cm soil depth (n = 27). Circles and diamonds denote sites under forest and cropland, respectively. Aluminous clay represents the weight sum of kaolinite and gibbsite present in the < 2-µm fraction and Fed denotes the content of total pedogenic Fe extractable by dithionite-citrate-bicarbonate.

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