Figure 5. Mean reflectance (left scale) and continuum-removed reflectance (right scale) spectra of LUCAS mineral soil samples, computed for arbitrary clay and SOC classes.

The clay classes are 0–20%, 20–40%, 40–60%, 60–80% and the SOC classes are 0–25 g C kg⁻¹, 25–50 g C kg⁻¹, 50–75 g C kg⁻¹, 75–200 g C kg⁻¹. Each panel regroups samples of a given SOC interval.