@article{fdi:010068061,
  title = {{C}onsideration of soil types for the calibration of molecular proxies for soil p{H} and temperature using global soil datasets and {V}ietnamese soil profiles},
  author = {{D}avtian, {N}. and {M}{\'e}not, {G}. and {B}ard, {E}. and {P}oulenard, {J}. and {P}odwojewski, {P}ascal},
  editor = {},
  language = {{ENG}},
  abstract = {{D}istribution of branched glycerol dialkyl glycerol tetraethers (br{GDGT}s) in soils depends on environmental parameters such as mean annual air temperature ({MAAT}) and soil p{H}. {MBT}'/{MBT}'5{ME} (methylation index of branched tetraethers) and {CBT}/{CBT}' (cyclization ratio of branched tetraethers) are ratios based on the relative abundances of br{GDGT}s. {U}sing these ratios, global and regional/local calibrations have been established using surface soils, but generally without any preliminary study of soil types. {I}n this study, we reconsider global {MAAT}-p{H}/br{GDGT} calibrations by assigning soil types to the 358 components of a composite soil dataset. {A}dditionally, we investigate br{GDGT}-derived proxies in five well-described soil profiles along an altitudinal transect in the {M}ount {F}an {S}i {P}an {N}ational {P}ark, northwestern {V}ietnam. {O}ur results show that at the global scale, traditional {MAAT}-p{H}/br{GDGT} relationships per soil type are significantly different and that {MAAT} (and p{H}) residuals per soil type may differ as well, for example between {A}lisols and {P}odzols. {T}his effect persists when 5- and 6-methyl br{GDGT}s are quantified separately. {M}oreover, {MAAT} (and p{H}) residuals per soil type are generally not clearly reduced, including in {L}eptosols, in which 6-methyl br{GDGT}s are present. {I}n the {F}an {S}i {P}an transect, {MBT}'/{CBT}-{MAAT} estimates showed no significant deviation from expected {MAAT}s. {W}e find, however, that soil type effect - related to vegetation changes and contrasting soil organic carbon properties - may bias {MAAT}-p{H} estimates in the {V}ietnamese soil transect. {F}urthermore, soil depth plays a role which differs between the different {F}an {S}i {P}an soil profiles, likely determined by soil type and history.},
  keywords = {{VIET} {NAM}},
  booktitle = {},
  journal = {{O}rganic {G}eochemistry},
  volume = {101},
  numero = {},
  pages = {140--153},
  ISSN = {0146-6380},
  year = {2016},
  DOI = {10.1016/j.orggeochem.2016.09.002},
  URL = {https://www.documentation.ird.fr/hor/fdi:010068061},
}