Chemical differences in soil organic matter fractions determined by diffuse-reflectance mid-infrared spectroscopy
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We performed mid-infrared (MidIR) spectral interpretation of fractionated fresh and incubated soils to determine changes in soil organic matter (SOM) chemistry during incubation. Soils from four sites and three depths were processed to obtain the light fraction (LF), particulate organic matter (POM), silt-sized (silt), and clay-sized (clay) fractions. Our results show that the LF and clay fractions have distinct spectral features regardless of site. The LF is characterized by absorbance at 3400 cm−1, as well as between 1750 and 1350 cm−1 The clay fraction is distinguished by absorption near 1230 ...