%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Desplanques, V.
%A Cary, L.
%A Mouret, J. C.
%A Trolard, F.
%A Bourrie, G.
%A Grauby, O.
%A Meunier, J. D.
%T Silicon transfers in a rice field in Camargue (France)
%D 2006
%L fdi:010052292
%G ENG
%J Journal of Geochemical Exploration
%K silicon cycle ; rice ; biogenic silica ; Camargue
%M CC:0002356389-0043
%N (1-3) Special Iss. SI
%P 190-193
%R 10.1016/j.gexplo.2005.08.036
%U https://www.documentation.ird.fr/hor/fdi:010052292
%> https://www.documentation.ird.fr/intranet/publi/depot/2011-07-27/010052292.pdf
%V 88
%W Horizon (IRD)
%X We conducted a study of the biogeochemical cycle of silicon in a rice field in Camargue (France) in order to evaluate the role of biogenic, silicon particles (BSi) in the cycle. Opal-A biogenic particles (phytoliths, diatoms...), which dissolve more rapidly than other forms of silicate usually present in soils, are postulated to represent the easiest bioavailable Si for rice. We found 0.03-0.06 wt.% of BSi in soils (mainly phytoliths). This value is lower than other values from the literature. Each year, the exportation of BSi from rice cultivation is 270 80 kg Si ha(-1). We show that BSi input by irrigation is mostly composed of diatoms and we estimate it at 100 kg Si ha(-1) year(-1). This value is more than a third of the annual Si need for rice. The budget of the dissolved silicon (DSi) fluxes gives the following results: the atmospheric and irrigation inputs represents 1% and roughly 10%, respectively, of the annual need for rice; the drainage and infiltration outputs represent 17 +/- 14 and 12 +/- 9 kg Si ha(-1) year(-1), respectively; the balance of our budget shows that at least 170 kg Si ha(-1) year(-1) are exported from the soil. If we consider the soil BSi as the only source of dissolved silicon, this stock could be exhausted in 5 years. (c) 2005 Elsevier B.V All rights reserved.