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Mid-Infrared and Near-Infrared Diffuse Reflectance Spectroscopy for Soil Carbon Measurement

^a Environmental Quality Laboratory, Building 007 Room 201, BARC-West, Beltsville, MD 20705
^b FDA, Rockville, MD
^c USDA-ARS Fort Collins, CO
^d USDA-NRCS Lincoln, NE

View larger version (30K): [in a new window]   Fig. 1. Geographic location of the 14 sampling sites within the west central United States.

View larger version (33K): [in a new window]   Fig. 2. Comparison of mid-infrared and near-infrared spectra of a highly calcareous soil before and after treatment with acid for removal of carbonates. The carbonate (i.e., CaCO3) spectrum in each spectral region is included for additional comparison.

View larger version (38K): [in a new window]   Fig. 3. Comparison of calibration for near-infrared and mid-infrared spectroscopy based on total and inorganic soil C measured by dry combustion (actual). Partial least squares (PLS) regression analysis for total C used 17 factors for mid-infrared spectroscopy (MIRS) and 16 factors for near- infrared spectroscopy (NIRS), and analysis for inorganic C used 16 factors for MIRS and 19 factors for NIRS. Residual Mean Squared Deviation is represented by RMSD.

View larger version (40K): [in a new window]   Fig. 4. Comparison of calibrations near- and mid-infrared spectroscopy based on organic C in untreated and acidified soils measured by dry combustion (actual). Partial Least Squares (PLS) regression analysis for organic C used 17 factors for mid-infrared spectroscopy (MIRS) and 18 factors for NIRS, and analysis for organic C (acid) used 19 factors for MIRS and 17 factors for NIRS. Residual Mean Squared Deviation is represented by RMSD.

View larger version (37K): [in a new window]   Fig. 5. Residual error distributions for mid-infrared spectroscopy (MIRS) and near-infrared spectroscopy (NIRS) calibrations. Dashed lines indicate two standard deviations (2).