@article{fdi:010067291,
  title = {{S}tudying the physical protection of soil carbon with quantitative infrared spectroscopy},
  author = {{B}arth{\`e}s, {B}ernard and {K}ouakoua, {E}rnest and {M}oulin {E}smard, {P}atricia and {H}maidi, {K}. and {G}allali, {T}. and {C}lairotte, {M}. and {B}ernoux, {M}artial and {B}ourdon, {E}mmanuel and {T}oucet, {J}o{\¨e}le and {C}hevallier, {T}iphaine},
  editor = {},
  language = {{ENG}},
  abstract = {{N}ear infrared ({NIR}) and mid-infrared (mid-{IR}) reflectance spectroscopy are time- and cost-effective tools for characterising soil organic carbon ({SOC}). {H}ere they were used for quantifying (i) carbon ({C}) dioxide ({CO}2) emission from soil samples crushed to 2 mm and 0.2 mm, at 18°{C} and 28°{C}; (ii) physical {C} protection, calculated as the difference between {CO}2 emissions from 0.2 mm and 2 mm crushed soil at a given temperature; and (iii) the temperature vulnerability of this protection, calculated as the difference between {C} protection at 18°{C} and 28°{C}. {T}his was done for 97 topsoil samples from {T}unisia, mostly calcareous, which were incubated for 21 days. {S}oil {CO}2 emission increased with temperature and fine crushing. {H}owever, {C} protection in 0.2–2 mm aggregates had little effect on the temperature vulnerability of {CO}2 emission, possibly due to preferential {SOC} protection in smaller aggregates. {I}n general, {NIR} spectroscopy, and to a lesser extent mid-{IR} spectroscopy, yielded accurate predictions of soil {CO}2 emission (0.60 ≤ {R}2 ≤ 0.91), and acceptable predictions of {C} protection at the beginning of incubation (0.52 ≤ {R}2 ≤ 0.81) but not over the whole 21 day period ({R}2 ≤ 0.59). {F}or {CO}2 emission, prediction error was the same order of magnitude as, and sometimes similar to, the uncertainty of conventional determination, indicating that a noticeable proportion of the former could be attributed to the latter. {T}he temperature vulnerability of {C} protection could not be modelled correctly ({R}2 ≤ 0.11), due to error propagation. {T}he prediction of {SOC} was better with {NIR} spectroscopy and that of soil inorganic {C} ({SIC}) was very accurate ({R}2 ≥ 0.94), especially with mid-{IR} spectroscopy. {S}oil {CO}2 emission, {C} protection and its vulnerability were best predicted with {NIR} spectra, those of 0.2 mm samples especially. {W}ith 2 mm samples, mid-{IR} spectroscopy yielded the worst predictions in general. {NIR} spectroscopy prediction models suggested that {CO}2 emission and {C} protection depended (i) on aliphatic compounds (i.e. labile substrates), dominantly at 18°{C}; (ii) on amides or proteins (i.e. microbial biomass), markedly at 28°{C}; and (iii) negatively, on organohalogens and aromatic amines (i.e. pesticides). {M}odels using mid-{IR} spectra showed a negative influence of carbonates on {CO}2 emission, suggesting they did not contribute to soil {CO}2 emission and might form during incubation. {T}hey also suggested that {CO}2 emission and {C} protection related to carboxylic acids, saturated aliphatic ones especially.},
  keywords = {{SOL} ; {MATIERE} {ORGANIQUE} ; {CARBONE} ; {SPECTROSCOPIE} ; {REFLECTANCE} ; {RESPIRATION} ; {ANALYSE} {MULTIVARIABLE} ; {TUNISIE}},
  booktitle = {{N}ear infrared spectroscopy of soils},
  journal = {{J}ournal of {N}ear {I}nfrared {S}pectroscopy},
  volume = {24},
  numero = {3},
  pages = {199--214},
  ISSN = {0967-0335},
  year = {2016},
  DOI = {10.1255/jnirs.1232},
  URL = {https://www.documentation.ird.fr/hor/fdi:010067291},
}