@article{fdi:010077345,
  title = {{S}hort-range-order minerals as powerful factors explaining deep soil organic carbon stock distribution : the case of a coffee agroforestry plantation on {A}ndosols in {C}osta {R}ica},
  author = {{C}hevallier, {T}iphaine and {F}ujisaki, {K}enji and {R}oupsard, {O}. and {G}uidat, {F}. and {K}inoshita, {R}. and {V}iginio, {E}. {D}. and {L}ehner, {P}. and {A}lain, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}oil organic carbon ({SOC}) constitutes the largest terrestrial {C} stock, particularly in the {A}ndosols of volcanic areas. {Q}uantitative information on distribution of {SOC} stocks is needed to construct a baseline for studying temporal changes in {SOC}. {T}he spatial variation of soil short-range-order minerals such as allophane usually explains the variability of topsoil {SOC} contents, but {SOC} data for deeper soil layers are needed. {W}e found that within a 1 km(2) {C}osta {R}ican basin covered by coffee agroforestry, {SOC} stocks in the upper 200 cm of soil were highly variable (24 to 72 kg {C} m(-2)). {T}opsoil {SOC} stocks were not correlated with {SOC} stocks present in deeper layers. {D}iffuse-reflectance mid-infrared ({MIR}) spectroscopy made possible the analysis of a large number of samples (69 soil profiles, i.e. 598 soil samples) for ammonium-oxalate and sodium-pyrophosphate-extractable forms of {A}l, {F}e, and {S}i, as well as {SOC} content and bulk density. {U}sing the {MIR} spectra, we identified two different soil materials, which were identified as allophanic and halloysitic soil material. {A}llophanic soil occurred on top of the halloysitic soil. {T}he thickness of the allophanic soil material, rich in {SRO} minerals and related to a young andic {A} horizon, explained the variability of {SOC}. {T}his study illustrates that knowledge of topography and pedogenesis is needed to understand and extrapolate the distribution of {SOC} stocks at landscape scales.},
  keywords = {{COSTA} {RICA}},
  booktitle = {},
  journal = {{S}oil},
  volume = {5},
  numero = {2},
  pages = {315--332},
  ISSN = {2199-3971},
  year = {2019},
  DOI = {10.5194/soil-5-315-2019},
  URL = {https://www.documentation.ird.fr/hor/fdi:010077345},
}