Figure 4 | Scientific Reports

Figure 4

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

Figure 4

Changes of OC stocks associated with soil density fractions (fLF and oLF = free and occluded light fraction; HF = heavy fraction) in mineralogical combinations and separated by soil depth. Sample numbers for the combinations are as follows: ‛low clay‒low Fe’ under forest (n = 4), ‛low clay‒high Fe’ under forest (n = 4), ‛high clay‒low Fe’ under forest (n = 3), ‛high clay‒high Fe’ under forest (n = 7); all cropland combinations (n = 3).

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