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Communication Dans Un Congrès Année : 2017

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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Dates et versions

hal-01602783 , version 1 (02-06-2020)

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Paternité - Partage selon les Conditions Initiales

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  • HAL Id : hal-01602783 , version 1
  • PRODINRA : 403691

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Wartini Ng, Budiman Minasny, Brendan P Malone, Nicolas Saby, Dominique Arrouays, et al.. Predicting and Mapping Topsoil Black carbon of France. Pedometrics 2017, Jun 2017, Wageningen, Netherlands. 298 p. ⟨hal-01602783⟩
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