Predicting and Mapping Topsoil Black carbon of France
Résumé
Black Carbon (BC) in soil is considered a stable or resistant form of carbon, and thus it
is important to determine its amount relative to the Total C (TC). As measurement of BC is
quite time-consuming, involving chemo-thermo-oxidation at 375◦C, decarbonation, and elemental
analysis, it is anticipated that BC can be predicted using a rapid sensing analysis such as the mid-
infrared spectroscopy. BC was only measured for topsoil at 158 sites in the French soil monitoring
network. On the other hand, total carbon, and mid-infrared reflectance were measured at 2130
sites on a regular 16 × 16-km grid. Contrary to what was found in the literature, we found that
BC was poorly predicted by the mid-infrared spectroscopy (Validation R2 ~ 0.25). Nevertheless,
BC was well predicted just using 3 soil variables (clay content, pH and Total C) with a mean
validation R2 of 0.45. Including soil properties along with the infrared spectra did not improve the
prediction. We concluded that this form of thermally-resistant Carbon is a combination of various
organo-mineral and pyrogenic forms of carbon, which may not have unique spectral feature. BC
content also varies across the area with a median BC/TC value of 0.05, and a minimum of 0.01
and a maximum of 0.32. Based on soil properties prediction, we map the concentration of Black
Carbon across France
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