Predicting and Mapping Topsoil Black carbon of France
2017
Ng, Wartini | Minasny, Budiman | Malone, Brendan P | Saby, Nicolas | Arrouays, Dominique | Barthès, Bernard | Clairotte, Michael | University of Sydney | InfoSol (InfoSol) ; Institut National de la Recherche Agronomique (INRA) | Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)
Black Carbon (BC) in soil is considered a stable or resistant form of carbon, and thus itis important to determine its amount relative to the Total C (TC). As measurement of BC isquite time-consuming, involving chemo-thermo-oxidation at 375◦C, decarbonation, and elementalanalysis, 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 monitoringnetwork. On the other hand, total carbon, and mid-infrared reflectance were measured at 2130sites on a regular 16 × 16-km grid. Contrary to what was found in the literature, we found thatBC 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 meanvalidation R2 of 0.45. Including soil properties along with the infrared spectra did not improve theprediction. We concluded that this form of thermally-resistant Carbon is a combination of variousorgano-mineral and pyrogenic forms of carbon, which may not have unique spectral feature. BCcontent also varies across the area with a median BC/TC value of 0.05, and a minimum of 0.01and a maximum of 0.32. Based on soil properties prediction, we map the concentration of BlackCarbon across France
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