@article{fdi:010055754,
  title = {{P}rediction of soil organic and inorganic carbon contents at a national scale ({F}rance) using mid-infrared reflectance spectroscopy ({MIRS})},
  author = {{G}rinand, {C}lovis and {B}arth{\`e}s, {B}ernard and {B}runet, {D}idier and {K}ouakoua, {E}rnest and {A}rrouays, {D}. and {J}olivet, {C}. and {C}aria, {G}. and {B}ernoux, {M}artial},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his 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 {F}rench topsoils (030 cm). {G}round 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. {C}alibrations of {MIR} spectra with partial least square regressions were developed with 1080% of the set and five random selections of samples. {C}omparisons 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. {O}ptimal 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. {A}t the 20% rate, organic carbon predictions over the validation set (80% of the total) yielded mean {R}2, 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. {T}his seemed appropriate for large-scale soil inventories and mapping studies but not for accurate carbon monitoring, possibly because carbonate soils were included. {M}ore work is needed on organic carbon calibrations for large-scale soil libraries.},
  keywords = {},
  booktitle = {},
  journal = {{E}uropean {J}ournal of {S}oil {S}cience},
  volume = {63},
  numero = {2},
  pages = {141--151},
  ISSN = {1351-0754},
  year = {2012},
  DOI = {10.1111/j.1365-2389.2012.01429.x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010055754},
}