@article{fdi:010074132,
  title = {{I}mpact of microbial activity on the mobility of metallic elements ({F}e, {A}l and {H}g) in tropical soils},
  author = {{B}alland-{B}olou-{B}i, {C}. and {B}olou-{B}i, {E}. {B}. and {A}lphonse, {V}. and {G}iusti-{M}iller, {S}. and {J}usselme, {M}. {D}. and {L}ivet, {A}. and {G}rimaldi, {M}ichel and {B}ousserhine, {N}.},
  editor = {},
  language = {{ENG}},
  abstract = {{D}issolved organic carbon ({DOC}), especially low molecular mass organic acids ({LMMOA}s) derives principally from biota degradation process in which soil microorganisms are the main actors and from roots exudates. {T}he presence of {LMMOA}s led to an increase of availability and mobility of metallic elements through the formation of organo-metallic complex. {I}n tropical soils, very few information about {LMMOA}s quantification and their role in the biogeochemical process related to trace metals cycling was available. {Q}uantification of {LMMOA}s is limited due to their low concentration and rapid degradation. {U}ntil now, the role of microbial activity as well as {LMMOA}s in the biogeochemical cycle of metallic elements in tropical soils has not been investigated. {T}he present study was conducted to evaluate the effect of microbial activity and biomass on the availability and mobility of metallic elements ({F}e, {A}l and {H}g) in two tropical soils, {F}erralsol and {A}crisol. {W}e also quantified {LMMOA}s contents in soil solutions and addressed to their role in the mobilization of metals. {U}tilization of {D}iffuse {G}radient in {T}hin film ({DGT}) method permits to analyze bioavailable metal in both fractions: organically complexed and free metals. {T}he results show that the quantity of {F}e, {A}l and {H}g labile were higher in {F}erralsol than {A}crisol soils. {T}his was more accentuated for the 50 cm-depth of soils where the microbial activities and the organic carbon content were important. {C}oncentration of {LMMOA}s of {F}erralsol and {A}crisol were lower in compare to coniferous and deciduous forest soils. {P}roportions of {LMMOA}s in {DOC} were very small at 10.5% and 6.85% in the {F}erralsol and {A}crisol soils, respectively. {T}he mobilization of {F}e, {A}l and {H}g in {F}erralsol and {A}crisol soils appeared to vary depending on the soil physico-chemical characteristics (sorption capacities and metals content) and also on the microbial biomass and activity. {S}oil p{H} influences the acidity of the functional groups in organic molecules and consequently their speciation. {I}n addition, low p{H} increase proton competition within acidic functional groups involved in coordinate bond. {T}he content of {CEC} in {F}erralsol is higher than {A}crisol that is related to the high contents of clay and organic carbon. {L}ow {CEC} content can result in a decrease of retain of the cationic trace metals. {L}ow {CEC} content led to a decrease of the capacity of retaining of metallic elements in tropical soils in compare to temperate soils.},
  keywords = {{T}ropical soils ; {L}ow molecular mass organic acids ; {DOC} ; {DGT} ; {M}etals ; {M}icrobial activity ; {GUYANE} {FRANCAISE} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{G}eoderma},
  volume = {334},
  numero = {},
  pages = {146--154},
  ISSN = {0016-7061},
  year = {2019},
  DOI = {10.1016/j.geoderma.2018.07.044},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074132},
}