Publications des scientifiques de l'IRD

Grinand Clovis, Barthès Bernard, Brunet Didier, Kouakoua Ernest, Arrouays D., Jolivet C., Caria G., Bernoux Martial. (2012). Prediction of soil organic and inorganic carbon contents at a national scale (France) using mid-infrared reflectance spectroscopy (MIRS). European Journal of Soil Science, 63 (2), p. 141-151. ISSN 1351-0754.

Titre du document
Prediction of soil organic and inorganic carbon contents at a national scale (France) using mid-infrared reflectance spectroscopy (MIRS)
Année de publication
2012
Type de document
Article référencé dans le Web of Science WOS:000301534700002
Auteurs
Grinand Clovis, Barthès Bernard, Brunet Didier, Kouakoua Ernest, Arrouays D., Jolivet C., Caria G., Bernoux Martial
Source
European Journal of Soil Science, 2012, 63 (2), p. 141-151 ISSN 1351-0754
This work aimed to evaluate the potential of mid-infrared reflectance spectroscopy (MIRS) to predict soil organic and inorganic carbon contents with a 2086-sample set representative of French topsoils (030 cm). Ground air-dried samples collected regularly using a 16 x 16-km grid were analysed for total (dry combustion) and inorganic (calcimeter) carbon; organic carbon was calculated by difference. Calibrations of MIR spectra with partial least square regressions were developed with 1080% of the set and five random selections of samples. Comparisons between samples with contrasting organic or inorganic carbon content and regression coefficients of calibration equations both showed that organic carbon was firstly associated with a wide spectral region around 2500-3500 cm-1 (which was a reflection of its complex nature), and inorganic carbon with narrow spectral bands, especially around 2520 cm-1. Optimal calibrations for both organic and inorganic carbon were achieved by using 20% of the total set: predictions were not improved much by including more of the set and were less stable, probably because of atypical samples. At the 20% rate, organic carbon predictions over the validation set (80% of the total) yielded mean R2, standard error of prediction (SEP) and RPD (ratio of standard deviation to SEP) of 0.89, 6.7 g kg-1 and 3.0, respectively; inorganic carbon predictions yielded 0.97, 2.8 g kg-1 and 5.6, respectively. This seemed appropriate for large-scale soil inventories and mapping studies but not for accurate carbon monitoring, possibly because carbonate soils were included. More work is needed on organic carbon calibrations for large-scale soil libraries.
Plan de classement
Pédologie [068]
Localisation
Fonds IRD [F B010055754]
Identifiant IRD
fdi:010055754
Contact