@article{fdi:010076594,
  title = {{F}looding effect on mineralogical and geochemical changes in alkaline-sodic soil system of northern {P}antanal wetlands, {B}razil},
  author = {{O}liveira, {J}. {C}. and {A}ndrade, {G}. {R}. {P}. and {B}arbi{\'e}ro, {L}aurent and {F}urquim, {S}. {A}. {C}. and {V}idal-{T}orrado, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n the northern {P}antanal wetlands of {B}razil, alkaline sodic soils play a significant role in the ecological functioning of the region, but little is known about their mineralogical equilibria in current flooding dynamics, which is necessary for good management of these areas. {T}his study focused on a transition between sodic and non-sodic soils, identified by low frequency electromagnetic induction survey. {S}amples of {B} horizons from alkaline-sodic and non-sodic soils were analyzed via soil solution from saturated paste, decomposition of {X}-ray diffraction ({XRD}) patterns and transmission electron microscopy with {X}-ray dispersive energy spectroscopy ({TEM}-{EDS}) analysis. {T}he transition between alkaline-sodic and non-sodic soils matches with the transition between flooded and non-flooded areas. {T}he soil solution shows a concentration factor of about 40 along this transition. {T}he formation of sodic soils results from an accumulation by evaporation of solutions with a positive calcite residual alkalinity ({RA}(calcite)), probably imposed by the chemistry of the {S}ao {L}ourenco {R}iver. {A}n increasing {N}a:{C}a ratio caused solonization of the exchange complex. {T}hese alkaline-sodic soils, however, can be interpreted as declining soils in the current context with an evacuation of soluble salts during flood cycles. {T}he detailed investigation of the fine clay fraction (< 0.2 mu m) using full profile modelling and decomposition of {XRD} patterns and {TEM}-{EDS} analysis demonstrates gradual transformations of trioctahedral to dioctahedral smectite by {M}g - {A}l substitutions on octahedral sites, leading to the prevalence of kaolinite-smectite interstratified minerals when the conditions become more acidic via the solodization process. {H}ighlights {C}lay minerals of alkaline-sodic soil have been altered due to flooding dynamic. {C}lay minerals are a useful tool for understanding environmental changes. {I}nterstratified clay minerals result from current acidification. {T}he evolution of soil mineral suite is related to the environmental changes.},
  keywords = {clay mineralogy ; kaolinite-smectite interstratified ; solonetz ; trioctahedral smectit ; tropical soils ; {X}-ray modeling ; {BRESIL}},
  booktitle = {},
  journal = {{E}uropean {J}ournal of {S}oil {S}cience},
  volume = {71},
  numero = {3},
  pages = {433--447},
  ISSN = {1351-0754},
  year = {2020},
  DOI = {10.1111/ejss.12871},
  URL = {https://www.documentation.ird.fr/hor/fdi:010076594},
}