@inproceedings{fdi:010094599,
  title = {{R}eactive transport modelling reveals changes in properties of tropical soils subjected to enhanced silicate weathering [r{\'e}sum{\'e}]},
  author = {{G}lorieux, {J}. and {G}odd{\'e}ris, {Y}. and {K}uppel, {S}ylvain and {D}elmelle, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}pplied regionally to cropland soils, enhanced silicate weathering ({ESW}) is advocated as a viable technology for enhancing the consumption of atmospheric {CO}2, while also providing ancillary benefits to soil fertility and crop growth. {H}owever, important uncertainties remain regarding the short- and long-term effects of silicate addition on weathering rate and soil properties. {T}o address this issue, we adapted and used the reactive transport model {WITCH}1 to simulate weathering in a tropical soil ({O}xisol) amended annually with 50 t ha-1 of crushed basalt over five years. {W}e monitored the changes in the soil chemical properties, primary and secondary mineralogy and {CO}2 consumption rate over a 10-year period. {T}he modelling results confirm that the instantaneous {CO}2 consumption rate increases with basalt application. {B}asalt weathering increases the p{H} of the soil solution, from acidic to alkaline values, and releases {C}a, {M}g and {K} in solution, thus serving as a plant nutrient source. {W}e also found that allophanes may form in the {O}xisol in response to dissolution of the basalt's glass and plagioclases. {A}s evidenced in volcanic soils, allophanes typically exhibit a significant potential for organic carbon stabilisation. {T}he formation of allophanes in the {O}xisol treated with basalt may improve aggregation processes, water retention and hydraulic conductivity, but may decrease phosphate availability further. {O}ur modelling study highlights that the intentional application of basalt to a tropical soil affects various soil properties significantly. {T}he short and long-term impacts of these changes on soil functioning will need to be assessed.},
  keywords = {},
  numero = {},
  pages = {{EGU}24--928 [1 ]},
  booktitle = {},
  year = {2025},
  DOI = {10.5194/egusphere-egu24-928},
  URL = {https://www.documentation.ird.fr/hor/fdi:010094599},
}