Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Applied Geochemistry S360-S362 2011 fdi:010054224 ENG Applied Geochemistry 0883-2927 ISI:000297788100105 Suppl. S 10.1016/j.apgeochem.2011.03.060 https://www.documentation.ird.fr/hor/fdi:010054224 https://www.documentation.ird.fr/intranet/publi/2011/12/010054224.pdf 26 Horizon (IRD) The global Si cycle is strongly controlled by riverine input. Over the last decade two parameters have been shown to play a significant role in the control of dissolved Si (DSi): biology, through the effects of diatom blooms and vegetation growth, and human activity, through the effects of eutrophication, urbanisation, agriculture, deforestation and damming. Human perturbations should now be better quantified when modelling the global Si cycle and particularly in the tropics. A case study is presented based on preliminary data along the Kaveri river (India) strongly impacted by dams. It is suggested that DSi is controlled by a combined effect of chemical weathering, damming and groundwater recharge. 064 UR161 / UR234 Inde